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Institute
- Medizinische Klinik und Poliklinik II (526) (remove)
Schriftenreihe
Sonstige beteiligte Institutionen
- Johns Hopkins School of Medicine (3)
- Center for Interdisciplinary Clinical Research, Würzburg University, Würzburg, Germany (2)
- Betriebsärztlicher Dienst der Universität Würzburg (1)
- Clinical Trial Center (CTC) / Zentrale für Klinische Studien Würzburg (ZKSW) (1)
- Department of Hematology and Oncology, Sana Hospital Hof, Hof, Germany (1)
- Department of Laboratory Medicine and Medicine Huddinge, Karolinska Institutet and University Hospital, Stockholm, Sweden (1)
- Department of Medicine A, University Hospital of Münster, Münster, Germany (1)
- Early Clinical Trial Unit, Comprehensive Cancer Center Mainfranken (1)
- Experimentelle Tumorimmunologie, Frauenklinik, Universität Würzburg (1)
- Interdisciplinary Center for Clinical Research (IZKF), Würzburg, Germany (1)
ResearcherID
- N-2030-2015 (1)
Background
Research in the field of surgery is mainly driven by aiming for trauma reduction as well as for personalized treatment concepts. Beyond laparoscopy, other proposed approaches for further reduction of the therapeutic trauma have failed to achieve clinical translation, with few notable exceptions. We believe that this is mainly due to a lack of flexibility and high associated costs. We aimed at addressing these issues by developing a novel minimally invasive operating platform and a preoperative design workflow for patient-individual adaptation and cost-effective rapid manufacturing of surgical manipulators. In this article, we report on the first in-vitro cholecystectomy performed with our operating platform.
Methods
The single-port overtube (SPOT) is a snake-like surgical manipulator for minimally invasive interventions. The system layout is highly flexible and can be adapted in design and dimensions for different kinds of surgery, based on patient- and disease-specific parameters. For collecting and analyzing this data, we developed a graphical user interface, which assists clinicians during the preoperative planning phase. Other major components of our operating platform include an instrument management system and a non-sterile user interface. For the trial surgery, we used a validated phantom which was further equipped with a porcine liver including the gallbladder.
Results
Following our envisioned preoperative design workflow, a suitable geometry of the surgical manipulator was determined for our trial surgery and rapidly manufactured by means of 3D printing. With this setup, we successfully performed a first in-vitro cholecystectomy, which was completed in 78 min.
Conclusions
By conducting the trial surgery, we demonstrated the effectiveness of our PLAFOKON operating platform. While some aspects – especially regarding usability and ergonomics – can be further optimized, the overall performance of the system is highly promising, with sufficient flexibility and strength for conducting the necessary tissue manipulations.
Objective
The current article encompasses a literature review and recommendations for radiotherapy in nodal oligorecurrent prostate cancer.
Materials and methods
A literature review focused on studies comparing metastasis-directed stereotactic ablative radiotherapy (SABR) vs. external elective nodal radiotherapy (ENRT) and studies analyzing recurrence patterns after local nodal treatment was performed. The DEGRO Prostate Cancer Expert Panel discussed the results and developed treatment recommendations.
Results
Metastasis-directed radiotherapy results in high local control (often > 90% within a follow-up of 1–2 years) and can be used to improve progression-free survival or defer androgen deprivation therapy (ADT) according to prospective randomized phase II data. Distant progression after involved-node SABR only occurs within a few months in the majority of patients. ENRT improves metastases-free survival rates with increased toxicity in comparison to SABR according to retrospective comparative studies. The majority of nodal recurrences after initial local treatment of pelvic nodal metastasis are detected within the true pelvis and common iliac vessels.
Conclusion
ENRT with or without a boost should be preferred to SABR in pelvic nodal recurrences. In oligometastatic prostate cancer with distant (extrapelvic) nodal recurrences, SABR alone can be performed in selected cases. Application of additional systemic treatments should be based on current guidelines, with ADT as first-line treatment for hormone-sensitive prostate cancer. Only in carefully selected patients can radiotherapy be initially used without additional ADT outside of the current standard recommendations. Results of (randomized) prospective studies are needed for definitive recommendations.
Background
Neoadjuvant chemotherapy (NACT) for early breast cancer can make breast-conserving surgery more feasible and might be more likely to eradicate micrometastatic disease than might the same chemotherapy given after surgery. We investigated the long-term benefits and risks of NACT and the influence of tumour characteristics on outcome with a collaborative meta-analysis of individual patient data from relevant randomised trials.
Methods
We obtained information about prerandomisation tumour characteristics, clinical tumour response, surgery, recurrence, and mortality for 4756 women in ten randomised trials in early breast cancer that began before 2005 and compared NACT with the same chemotherapy given postoperatively. Primary outcomes were tumour response, extent of local therapy, local and distant recurrence, breast cancer death, and overall mortality. Analyses by intention-to-treat used standard regression (for response and frequency of breast-conserving therapy) and log-rank methods (for recurrence and mortality).
Findings
Patients entered the trials from 1983 to 2002 and median follow-up was 9 years (IQR 5-14), with the last follow-up in 2013. Most chemotherapy was anthracycline based (3838 [81%] of 4756 women). More than two thirds (1349 [69%] of 1947) of women allocated NACT had a complete or partial clinical response. Patients allocated NACT had an increased frequency of breast-conserving therapy (1504 [65%] of 2320 treated with NACT vs 1135 [49%] of 2318 treated with adjuvant chemotherapy). NACT was associated with more frequent local recurrence than was adjuvant chemotherapy: the 15 year local recurrence was 21.4% for NACT versus 15.9% for adjuvant chemotherapy (5.5% increase [95% CI 2.4-8.6]; rate ratio 1.37 [95% CI 1.17-1.61]; p = 0.0001). No significant difference between NACT and adjuvant chemotherapy was noted for distant recurrence (15 year risk 38.2% for NACT vs 38.0% for adjuvant chemotherapy; rate ratio 1.02 [95% CI 0.92-1.14]; p = 0.66), breast cancer mortality (34.4% vs 33.7%; 1.06 [0.95-1.18]; p = 0.31), or death from any cause (40.9% vs 41.2%; 1.04 [0.94-1.15]; p = 0.45).
Interpretation
Tumours downsized by NACT might have higher local recurrence after breast-conserving therapy than might tumours of the same dimensions in women who have not received NACT. Strategies to mitigate the increased local recurrence after breast-conserving therapy in tumours downsized by NACT should be considered-eg, careful tumour localisation, detailed pathological assessment, and appropriate radiotherapy. Copyright (c) The Author(s). Published by Elsevier Ltd.
After priming in Peyer's patches (PPs) and mesenteric lymph nodes (mLN) T- cells infiltrate the intestine through lymphatic draining and homing through the bloodstream. However, we found that in mouse models of acute graft-versus-host disease (GvHD), a subset of alloreactive T-cells directly migrates from PPs to the adjacent intestinal lamina propria (LP), bypassing the normal lymphatic drainage and vascular trafficking routes. Notably, this direct migration occurred in irradiated and unirradiated GvHD models, indicating that irradiation is not a prerequisite for this observed behavior.
Next, we established a method termed serial intravascular staining (SIVS) in mouse models to systematically investigate the trafficking and migration of donor T- cells in the early stages of acute GvHD initiation. We found that the direct migration of T-cells from PPs to LP resulted in faster recruitment of cells after allogeneic hematopoietic cell transplantation (allo-HCT). These directly migrating T-cells were found to be in an activated and proliferative state, exhibiting a TH1/TH17-like phenotype and producing cytokines such as IFN-γ and TNF-α. Furthermore, we observed that the directly migrating alloreactive T-cells expressed specific integrins (α4+, αE+) and chemokine receptors (CxCR3+, CCR5+, and CCR9+). Surprisingly, blocking these integrins and chemokine-coupled receptors did not hinder the direct migration of T- cells from PPs to LP, suggesting the involvement of alternative mechanisms. Previous experiments ruled out the involvement of S1PR1 and topographical features of macrophages, leading us to hypothesize that mediators of cytoskeleton reorganization, such as Coro1a, Dock2, or Cdc42, may play a role in this unique migration process.
Additionally, we observed that directly migrating T-cells created a local inflammatory microenvironment, which attracts circulating T-cells. Histological analysis confirmed that alloreactive PPs-derived T-cells and bloodborne T-cells colocalized. We employed two experimental approaches, including either photoconversion of T-cells in PPs or direct transfer of activated T-cells into the vasculature, to demonstrate this colocalization. We hypothesize that cytokines released by migrating T-cells, such as IFN-γ and TNF-α, may play a role in recruiting T-cells from the vasculature, as inhibiting chemokine-coupled receptors did not impair recruitment.
Obwohl es in den letzten 10-15 Jahren gelang, multiple MM-Genome mittels NGS auf eine kosteneffiziente Art und mit geringem Zeit- und Materialaufwand zu sequenzieren und hierdurch zum Teil bahnbrechende Erkenntnisse gewonnen werden konnten, sind molekulargenetische Untersuchungen im diagnostischen Workflow des MMs bisher nicht ausreichend implementiert, um eine personalisierte Therapieentscheidung zu ermöglichen.
Vor diesem Hintergrund wurde in der vorliegenden Arbeit eine Gruppe an Patienten mit NDMM und RRMM anhand klinischer Parameter charakterisiert und durch Verwendung des M³P-Panels auf das Vorliegen bestimmter molekulargenetischer Veränderungen untersucht. Zusammenfassend lässt sich sagen, dass unsere Analyse die bisher veröffentliche M³P-Prävalenz in MM-Tumorproben bestätigt. Zu den am häufigsten mutierten Genen gehörten KRAS, NRAS, DIS3, ATM und BRAF. In der Gruppe der Patienten mit NRAS-Mutation oder del17p war die Zahl der relevanten Mutationen deutlich höher als ohne Vorliegen der entsprechenden Veränderung. Der Nachweis eines Double-Hit-Myeloms war erwartungsgemäß der stärkste ungünstige Faktor in unserer Kohorte. Unter den Patienten mit CRBN-Mutation waren alle IMiD-vorbehandelt und zeigten im Verlauf eine Refraktärität gegenüber dieser Substanzgruppe auf. Bezüglich der Überlebensanalysen bestätigten unsere Ergebnisse bereits bekannte prognostische Risikofaktoren wie Hochrisikozytogenetik, insbesondere del17p und gain1q, eine TP53-Mutation sowie ISS- und R-ISS-Stadium III.
Die Ergebnisse der Mutationsanalysen dieser Arbeit verdeutlichen den großen wissenschaftlichen und therapeutischen Nutzen, der von molekulargenetischen Untersuchungen ausgeht. Zukünftig werden auch beim MM Therapieentscheidungen auf Grundlage genetischer Diagnostik getroffen werden, mit dem Ziel die Behandlung für MM-Patienten weiter zu verbessern.
A growing body of literature reports on the upregulation of C-X-C motif chemokine receptor 4 (CXCR4) in a variety of cancer entities, rendering this receptor as suitable target for molecular imaging and endoradiotherapy in a theranostic setting. For instance, the CXCR4-targeting positron emission tomography (PET) agent [\(^{68}\)Ga]PentixaFor has been proven useful for a comprehensive assessment of the current status quo of solid tumors, including adrenocortical carcinoma or small-cell lung cancer. In addition, [\(^{68}\)Ga]PentixaFor has also provided an excellent readout for hematological malignancies, such as multiple myeloma, marginal zone lymphoma, or mantle cell lymphoma. PET-based quantification of the CXCR4 capacities in vivo allows for selecting candidates that would be suitable for treatment using the theranostic equivalent [\(^{177}\)Lu]/[\(^{90}\)Y]PentixaTher. This CXCR4-directed theranostic concept has been used as a conditioning regimen prior to hematopoietic stem cell transplantation and to achieve sufficient anti-lymphoma/-tumor activity in particular for malignant tissues that are highly sensitive to radiation, such as the hematological system. Increasing the safety margin, pretherapeutic dosimetry is routinely performed to determine the optimal activity to enhance therapeutic efficacy and to reduce off-target adverse events. The present review will provide an overview of current applications for CXCR4-directed molecular imaging and will introduce the CXCR4-targeted theranostic concept for advanced hematological malignancies.
Purpose
Oncologists are at an increased risk of developing burnout, leading to negative consequences in patient care and in professional satisfaction and quality of life. This study was designed to investigate exhaustion and disengagement among German oncologists and assess the prevalence of burnout among oncologists within different professional settings. Furthermore, we wanted to examine possible relations between sociodemographic factors, the oncological setting, professional experience and different aspects of burnout.
Methods
In a cross-sectional study design, an Internet-based survey was conducted with 121 oncologists between April and July 2020 using the Oldenburg Burnout Inventory, which contains items on exhaustion, disengagement, and burnout. Furthermore, sociodemographic data of the participants were assessed. The participants were members of the Working Group Medical Oncology (Arbeitsgemeinschaft Internistische Onkologie) within the German Cancer Society.
Results
The survey showed a burnout prevalence of 43.8%, which correlated with age and professional experience; that is, the prevalence is particularly high among younger oncologists. Exhaustion is closely related to employment status; that is, it was significantly higher among employed oncologists. There were remarkably low levels of disengagement among oncologists, highlighting the own demand to fulfil job requirements despite imminent or actual overburdening in daily work.
Conclusion
More support is necessary to mitigate the professional stressors in the healthcare system. To ensure quality medical care, employees should be offered preventive mental health services early in their careers.
Objective
Blindness is a feared complication of giant cell arteritis (GCA). However, the spectrum of pathologic orbital imaging findings on magnetic resonance imaging (MRI) in GCA is not well understood. In this study, we assess inflammatory changes of intraorbital structures on black blood MRI (BB-MRI) in patients with GCA compared to age-matched controls.
Methods
In this multicenter case-control study, 106 subjects underwent BB-MRI. Fifty-six patients with clinically or histologically diagnosed GCA and 50 age-matched controls without clinical or laboratory evidence of vasculitis were included. All individuals were imaged on a 3-T MR scanner with a post-contrast compressed-sensing (CS) T1-weighted sampling perfection with application-optimized contrasts using different flip angle evolution (SPACE) BB-MRI sequence. Imaging results were correlated with available clinical symptoms.
Results
Eighteen of 56 GCA patients (32%) showed inflammatory changes of at least one of the intraorbital structures. The most common finding was enhancement of at least one of the optic nerve sheaths (N = 13, 72%). Vessel wall enhancement of the ophthalmic artery was unilateral in 8 and bilateral in 3 patients. Enhancement of the optic nerve was observed in one patient. There was no significant correlation between imaging features of inflammation and clinically reported orbital symptoms (p = 0.10). None of the age-matched control patients showed any inflammatory changes of intraorbital structures.
Conclusions
BB-MRI revealed inflammatory findings in the orbits in up to 32% of patients with GCA. Optic nerve sheath enhancement was the most common intraorbital inflammatory change on BB-MRI. MRI findings were independent of clinically reported orbital symptoms.
Key Points
• Up to 32% of GCA patients shows signs of inflammation of intraorbital structures on BB-MRI.
• Enhancement of the optic nerve sheath is the most common intraorbital finding in GCA patients on BB-MRI.
• Features of inflammation of intraorbital structures are independent of clinically reported symptoms.
Background
CXCR4-directed positron emission tomography/computed tomography (PET/CT) has been used as a diagnostic tool in patients with solid tumors. We aimed to determine a potential correlation between tumor burden and radiotracer accumulation in normal organs.
Methods
Ninety patients with histologically proven solid cancers underwent CXCR4-targeted [\(^{68}\)Ga]Ga-PentixaFor PET/CT. Volumes of interest (VOIs) were placed in normal organs (heart, liver, spleen, bone marrow, and kidneys) and tumor lesions. Mean standardized uptake values (SUV\(_{mean}\)) for normal organs were determined. For CXCR4-positive tumor burden, maximum SUV (SUV\(_{max}\)), tumor volume (TV), and fractional tumor activity (FTA, defined as SUV\(_{mean}\) x TV), were calculated. We used a Spearman's rank correlation coefficient (ρ) to derive correlative indices between normal organ uptake and tumor burden.
Results
Median SUV\(_{mean}\) in unaffected organs was 5.2 for the spleen (range, 2.44 – 10.55), 3.27 for the kidneys (range, 1.52 – 17.4), followed by bone marrow (1.76, range, 0.84 – 3.98), heart (1.66, range, 0.88 – 2.89), and liver (1.28, range, 0.73 – 2.45). No significant correlation between SUV\(_{max}\) in tumor lesions (ρ ≤ 0.189, P ≥ 0.07), TV (ρ ≥ -0.204, P ≥ 0.06) or FTA (ρ ≥ -0.142, P ≥ 0.18) with the investigated organs was found.
Conclusions
In patients with solid tumors imaged with [\(^{68}\)Ga]Ga-PentixaFor PET/CT, no relevant tumor sink effect was noted. This observation may be of relevance for therapies with radioactive and non-radioactive CXCR4-directed drugs, as with increasing tumor burden, the dose to normal organs may remain unchanged.
Objectives
Mechanisms of wound healing are often impaired in patients with osteonecrosis of the jaw (ONJ). According to the guidelines for the treatment of this disease, early surgical intervention is indicated. However, surgery often faces complications such as wound healing disorders. The application of platelet-rich fibrin (PRF) after necrosectomy between bone and mucosa may constitute a promising approach to improve surgical results. An aspect that was not investigated until now is that PRF acts as a “bio-carrier” for antibiotics previously applied intravenously.
Materials and methods
We investigated the antimicrobial properties of PRF in 24 patients presenting ONJ undergoing systemic antibiosis with ampicillin/sulbactam. We measured the concentration of ampicillin/sulbactam in plasma and PRF and performed agar diffusion tests. Ampicillin/sulbactam was applied intravenously to the patient 10 minutes for blood sampling for PRF. No further incorporation of patients’ blood or PRF product with antibiotic drugs was obtained. Four healthy patients served as controls.
Results
Our results revealed that PRF is highly enriched with ampicillin/sulbactam that is released to the environment. The antibiotic concentration in PRF was comparable to the plasma concentration of ampicillin/sulbactam. The inhibition zone (IZ) of PRF was comparable to the standard ampicillin/sulbactam discs used in sensitivity testing.
Conclusions
The results of our study demonstrated that PRF is a reliable bio-carrier for systemic applied antibiotics and exhibits a large antimicrobial effect.
Clinical relevance
We describe a clinically useful feature of PRF as a bio-carrier for antibiotics. Especially when applied to poorly perfused tissues and bone such as in ONJ, the local release of antibiotics can reduce wound healing disorders like infections.
Purpose
Growing evidence implies that transition to parenthood triggers symptoms of mental burden not only in women but likewise in men, especially in high-risk pregnancies. This is the first study that examined and compared the prevalence rates of depression, anxiety, and somatic symptom burden of expectant fathers who face different risk situations during pregnancy.
Methods
Prevalence rates of paternal depression (Edinburgh postnatal depression scale), anxiety (generalized anxiety disorder seven), and somatic symptom burden (somatic symptom scale eight) were examined in two risk samples and one control group in the third trimester of their partners’ pregnancy: risk sample I (n = 41) consist of expectant fathers whose partners were prenatally hospitalized due to medical complications; risk sample II (n = 52) are fathers whose partners were prenatally mentally distressed; and control group (n = 70) are those non-risk pregnancies.
Results
On a purely descriptive level, the data display a trend of higher symptom burden of depression, anxiety, and somatic symptoms in the two risk samples, indicating that expectant fathers, whose pregnant partners were hospitalized or suffered prenatal depression, were more prenatally distressed. Exploratory testing of group differences revealed an almost three times higher prevalence rate of anxiety in fathers whose partner was hospitalized (12.2%) compared to those non-risks (4.3%).
Conclusion
Results underline the need for screening implementations for paternal prenatal psychological distress, as well as specific prevention and treatment programs, especially for fathers in risk situations, such as their pregnant partners’ prenatal hospitalization.
The study was registered with the German clinical trials register (DRKS00020131) on 2019/12/09.
Pilot study of a new freely available computer-aided polyp detection system in clinical practice
(2022)
Purpose
Computer-aided polyp detection (CADe) systems for colonoscopy are already presented to increase adenoma detection rate (ADR) in randomized clinical trials. Those commercially available closed systems often do not allow for data collection and algorithm optimization, for example regarding the usage of different endoscopy processors. Here, we present the first clinical experiences of a, for research purposes publicly available, CADe system.
Methods
We developed an end-to-end data acquisition and polyp detection system named EndoMind. Examiners of four centers utilizing four different endoscopy processors used EndoMind during their clinical routine. Detected polyps, ADR, time to first detection of a polyp (TFD), and system usability were evaluated (NCT05006092).
Results
During 41 colonoscopies, EndoMind detected 29 of 29 adenomas in 66 of 66 polyps resulting in an ADR of 41.5%. Median TFD was 130 ms (95%-CI, 80–200 ms) while maintaining a median false positive rate of 2.2% (95%-CI, 1.7–2.8%). The four participating centers rated the system using the System Usability Scale with a median of 96.3 (95%-CI, 70–100).
Conclusion
EndoMind’s ability to acquire data, detect polyps in real-time, and high usability score indicate substantial practical value for research and clinical practice. Still, clinical benefit, measured by ADR, has to be determined in a prospective randomized controlled trial.
Bereits in Vorstudien konnte dargelegt werden, dass eine signifikante Korrelation zwischen der T-Zell-Zytokin-Antwort und der berufs- bzw. umweltbedingten Schimmelpilzbelastung besteht. Ziel der vorliegenden Studie war, eine mögliche Kombination von Biomarkern ausfindig zu machen, die veränderte T-Zell-Antworten auf A. fumigatus- Antigene bei beruflich Exponierten im Vergleich zu Kontrollprobanden/-innen vorhersagen kann. Um geeignete Marker für das Bio-Monitoring zu finden, wurden zur T-Zell-Aktivierung ein myzeliales A. fumigatus - Lysat und 12 proteinogene Antigene in ELISpot-Versuchen für die Signaturzytokine IFN-γ (TH1), IL-5 (TH2) und IL-17A (TH17) der Haupt-TH-Subpopulationen getestet.
Es zeigten sich bei den Biolandwirten/-innen erwartungsgemäß erhöhte TH1- und TH2-Antworten auf die Mehrzahl der verwendeten spezifischen A. fumigatus-Antigene, die möglicherweise eine Schimmelpilzbelastung serologisch nachweisbar machen. Insbesondere die spezifischen A. fumigatus-Antigene Aspf22, CatB und CipC konnten eine Trennschärfe zwischen den beiden Kohorten hinsichtlich ihrer IFN-γ- und IL-5-Zytokinantwort erzielen. Unterschiede in der TH17-Antwort aufgrund chronischer beruflicher Sporenbelastung ohne Krankheitskorrelat konnten nicht explizit festgestellt werden. Weiterhin ergab sich, dass erhöhte TH2-Immunreaktionen, sofern sie mit einer adäquaten TH1-gerichteten Immunantwort einhergehen und damit eine ausgeglichene TH2/TH1-Balance besteht, nicht zwangsläufig zu Hypersensitivitätserkrankungen führen. Im Vergleich zu Langzeitexponierten wurden teilweise überlappende TH-Zellfrequenzen bei beruflich exponierten Biolandwirten/-innen ermittelt. Welche entscheidende Rolle Treg-Zellen bei der Eindämmung überschießender Immunantworten einnehmen, kann hieraus erahnt werden.
For the treatment of Multiple Myeloma, proteasome inhibitors are highly efficient and widely used, but resistance is a major obstacle to successful therapy. Several underlying mechanisms have been proposed but were only reported for a minority of resistant patients. The proteasome is a large and complex machinery. Here, we focus on the AAA ATPases of the 19S proteasome regulator (PSMC1-6) and their implication in PI resistance. As an example of cancer evolution and the acquisition of resistance, we conducted an in-depth analysis of an index patient by applying FISH, WES, and immunoglobulin-rearrangement sequencing in serial samples, starting from MGUS to newly diagnosed Multiple Myeloma to a PI-resistant relapse. The WES analysis uncovered an acquired PSMC2 Y429S mutation at the relapse after intensive bortezomib-containing therapy, which was functionally confirmed to mediate PI resistance. A meta-analysis comprising 1499 newly diagnosed and 447 progressed patients revealed a total of 36 SNVs over all six PSMC genes that were structurally accumulated in regulatory sites for activity such as the ADP/ATP binding pocket. Other alterations impact the interaction between different PSMC subunits or the intrinsic conformation of an individual subunit, consequently affecting the folding and function of the complex. Interestingly, several mutations were clustered in the central channel of the ATPase ring, where the unfolded substrates enter the 20S core. Our results indicate that PSMC SNVs play a role in PI resistance in MM.
(1) Background: Interventional endoscopic procedures are growing more popular, requiring innovative instruments and novel techniques. Three-dimensional printing has demonstrated great potential for the rapid development of prototypes that can be used for the early assessment of various concepts. In this work, we present the development of a flexible endoscopic instrument and explore its potential benefits. (2) Methods: The properties of the instrument, such as its maneuverability, flexibility, and bending force, were evaluated in a series of bench tests. Additionally, the effectiveness of the instrument was evaluated in an ex vivo porcine model by medical experts, who graded its properties and performance. Furthermore, the time necessary to complete various interventional endoscopic tasks was recorded. (3) Results: The instrument achieved bending angles of ±216° while achieving a bending force of 7.85 (±0.53) Newtons. The time needed to reach the operating region was 120 s median, while it took 70 s median to insert an object in a cavity. Furthermore, it took 220 s median to insert the instrument and remove an object from the cavity. (4) Conclusions: This study presents the development of a flexible endoscopic instrument using three-dimensional printing technology and its evaluation. The instrument demonstrated high bending angles and forces, and superior properties compared to the current state of the art. Furthermore, it was able to complete various interventional endoscopic tasks in minimal time, thus potentially leading to the improved safety and effectiveness of interventional endoscopic procedures in the future.
Tuberculosis (TB) is one of the leading causes of death by an infectious disease. It remains a major health burden worldwide, in part due to misdiagnosis. Therefore, improved diagnostic tests allowing the faster and more reliable diagnosis of patients with active TB are urgently needed. This prospective study examined the performance of the new molecular whole-blood test T-Track\(^®\) TB, which relies on the combined evaluation of IFNG and CXCL10 mRNA levels, and compared it to that of the QuantiFERON\(^®\)-TB Gold Plus (QFT-Plus) enzyme-linked immunosorbent assay (ELISA). Diagnostic accuracy and agreement analyses were conducted on the whole blood of 181 active TB patients and 163 non-TB controls. T-Track\(^®\) TB presented sensitivity of 94.9% and specificity of 93.8% for the detection of active TB vs. non-TB controls. In comparison, the QFT-Plus ELISA showed sensitivity of 84.3%. The sensitivity of T-Track\(^®\) TB was significantly higher (p < 0.001) than that of QFT-Plus. The overall agreement of T-Track\(^®\) TB with QFT-Plus to diagnose active TB was 87.9%. Out of 21 samples with discordant results, 19 were correctly classified by T-Track\(^®\) TB while misclassified by QFT-Plus (T-Track\(^®\) TB-positive/QFT-Plus-negative), and two samples were misclassified by T-Track\(^®\) TB while correctly classified by QFT-Plus (T-Track\(^®\) TB-negative/QFT-Plus-positive). Our results demonstrate the excellent performance of the T-Track\(^®\) TB molecular assay and its suitability to accurately detect TB infection and discriminate active TB patients from non-infected controls.
We assume that a specific health constraint, e.g., a certain aspect of bodily function or quality of life that is measured by a variable X, is absent (or irrelevant) in a healthy reference population (Ref0), and it is materially present and precisely measured in a diseased reference population (Ref1). We further assume that some amount of this constraint of interest is suspected to be present in a population under study (SP). In order to quantify this issue, we propose the introduction of an intuitive measure, the population comparison index (PCI), that relates the mean value of X in population SP to the mean values of X in populations Ref0 and Ref1. This measure is defined as PCI[X] = (mean[X|SP] − mean[X|Ref0])/(mean[X|Ref1] − mean[X|Ref0]) × 100[%], where mean[X|.] is the average value of X in the respective group of individuals. For interpretation, PCI[X] ≈ 0 indicates that the values of X in the population SP are similar to those in population Ref0, and hence, the impairment measured by X is not materially present in the individuals in population SP. On the other hand, PCI[X] ≈ 100 means that the individuals in SP exhibit values of X comparable to those occurring in Ref1, i.e., the constraint of interest is equally present in populations SP and Ref1. A value of 0 < PCI[X] < 100 indicates that a certain percentage of the constraint is present in SP, and it is more than in Ref0 but less than in Ref1. A value of PCI[X] > 100 means that population SP is even more affected by the constraint than population Ref1.
Several studies have shown that tapering or stopping disease-modifying anti-rheumatic drugs (DMARDs) in rheumatoid arthritis (RA) patients in sustained remission is feasible. However, tapering/stopping bears the risk of decline in physical function as some patients may relapse and face increased disease activity. Here, we analyzed the impact of tapering or stopping DMARD treatment on the physical function of RA patients. The study was a post hoc analysis of physical functional worsening for 282 patients with RA in sustained remission tapering and stopping DMARD treatment in the prospective randomized RETRO study. HAQ and DAS-28 scores were determined in baseline samples of patients continuing DMARD (arm 1), tapering their dose by 50% (arm 2), or stopping after tapering (arm 3). Patients were followed over 1 year, and HAQ and DAS-28 scores were evaluated every 3 months. The effect of treatment reduction strategy on functional worsening was assessed in a recurrent-event Cox regression model with a study-group (control, taper, and taper/stop) as the predictor. Two-hundred and eighty-two patients were analyzed. In 58 patients, functional worsening was observed. The incidences suggest a higher probability of functional worsening in patients tapering and/or stopping DMARDs, which is likely due to higher relapse rates in these individuals. At the end of the study, however, functional worsening was similar among the groups. Point estimates and survival curves show that the decline in functionality according to HAQ after tapering or discontinuation of DMARDs in RA patients with stable remission is associated with recurrence, but not with an overall functional decline.
While glioblastoma (GBM) is still challenging to treat, novel immunotherapeutic approaches have shown promising effects in preclinical settings. However, their clinical breakthrough is hampered by complex interactions of GBM with the tumor microenvironment (TME). Here, we present an analysis of TME composition in a patient-derived organoid model (PDO) as well as in organotypic slice cultures (OSC). To obtain a more realistic model for immunotherapeutic testing, we introduce an enhanced PDO model. We manufactured PDOs and OSCs from fresh tissue of GBM patients and analyzed the TME. Enhanced PDOs (ePDOs) were obtained via co-culture with PBMCs (peripheral blood mononuclear cells) and compared to normal PDOs (nPDOs) and PT (primary tissue). At first, we showed that TME was not sustained in PDOs after a short time of culture. In contrast, TME was largely maintained in OSCs. Unfortunately, OSCs can only be cultured for up to 9 days. Thus, we enhanced the TME in PDOs by co-culturing PDOs and PBMCs from healthy donors. These cellular TME patterns could be preserved until day 21. The ePDO approach could mirror the interaction of GBM, TME and immunotherapeutic agents and may consequently represent a realistic model for individual immunotherapeutic drug testing in the future.
Background
Endoscopic vacuum therapy (EVT) is an effective treatment option for leakage of the upper gastrointestinal (UGI) tract. The aim of this study was to evaluate the clinical impact of quality improvements in EVT management on patients’ outcome.
Methods
All patients treated by EVT at our center during 2012–2021 were divided into two consecutive and equal-sized cohorts (period 1 vs. period 2). Over time several quality improvement strategies were implemented including the earlier diagnosis and EVT treatment and technical optimization of endoscopy. The primary endpoint was defined as the composite score MTL30 (mortality, transfer, length-of-stay > 30 days). Secondary endpoints included EVT efficacy, complications, in-hospital mortality, length-of-stay (LOS) and nutrition status at discharge.
Results
A total of 156 patients were analyzed. During the latter period the primary endpoint MTL30 decreased from 60.8 to 39.0% (P = .006). EVT efficacy increased from 80 to 91% (P = .049). Further, the need for additional procedures for leakage management decreased from 49.9 to 29.9% (P = .013) and reoperations became less frequent (38.0% vs.15.6%; P = .001). The duration of leakage therapy and LOS were shortened from 25 to 14 days (P = .003) and 38 days to 25 days (P = .006), respectively. Morbidity (as determined by the comprehensive complication index) decreased from 54.6 to 46.5 (P = .034). More patients could be discharged on oral nutrition (70.9% vs. 84.4%, P = .043).
Conclusions
Our experience confirms the efficacy of EVT for the successful management of UGI leakage. Our quality improvement analysis demonstrates significant changes in EVT management resulting in accelerated recovery, fewer complications and improved functional outcome.
Background
Pancreatic adenocarcinoma (PDAC) patients with preoperative carbohydrate antigen 19-9 (CA19-9) serum levels higher than 500 U/ml are classified as biologically borderline resectable (BR-B). To date, the impact of cholestasis on preoperative CA19-9 serum levels in these patients has remained unquantified.
Methods
Data on 3079 oncologic pancreatic resections due to PDAC that were prospectively acquired by the German Study, Documentation and Quality (StuDoQ) registry were analyzed in relation to preoperative CA19-9 and bilirubin serum values. Preoperative CA19-9 values were adjusted according to the results of a multivariable linear regression analysis of pathologic parameters, bilirubin, and CA19-9 values.
Results
Of 1703 PDAC patients with tumor located in the pancreatic head, 420 (24.5 %) presented with a preoperative CA19-9 level higher than 500 U/ml. Although receiver operating characteristics (ROC) analysis failed to determine exact CA19-9 cut-off values for prognostic indicators (R and N status), the T, N, and G status; the UICC stage; and the number of simultaneous vein resections increased with the level of preoperative CA19-9, independently of concurrent cholestasis. After adjustment of preoperative CA19-9 values, 18.5 % of patients initially staged as BR-B showed CA19-9 values below 500 U/ml. However, the postoperative pathologic results for these patients did not change compared with the patients who had CA19-9 levels higher than 500 U/ml after bilirubin adjustment.
Conclusions
In this multicenter dataset of PDAC patients, elevation of preoperative CA19-9 correlated with well-defined prognostic pathologic parameters. Bilirubin adjustment of CA19-9 is feasible but does not affect the prognostic value of CA19-9 in jaundiced patients.
Articular cartilage defects represent one of the most challenging clinical problem for orthopedic surgeons and cartilage damage after trauma can result in debilitating joint pain, functional impairment and in the long-term development of osteoarthritis. The lateral cartilage-cartilage integration is crucial for the long-term success and to prevent further tissue degeneration. Tissue adhesives and sealants are becoming increasingly more popular and can be a beneficial approach in fostering tissue integration, particularly in tissues like cartilage where alternative techniques, such as suturing, would instead introduce further damage. However, adhesive materials still require optimization regarding the maximization of adhesion strength on the one hand and long-term tissue integration on the other hand. In vitro models can be a valuable support in the investigation of potential candidates and their functional mechanisms. For the conducted experiments within this work, an in vitro disc/ring model obtained from porcine articular cartilage tissue was established. In addition to qualitative evaluation of regeneration, this model facilitates the implementation of biomechanical tests to quantify cartilage integration strength. Construct harvesting for histology and other evaluation methods could be standardized and is ethically less questionable compared to in vivo testing. The opportunity of cell culture technique application for the in vitro model allowed a better understanding of cartilage integration processes.
Tissue bonding requires chemical or physical interaction of the adhesive material and the substrate. Adhesive hydrogels can bind to the defect interface and simultaneously fill the gap of irregularly shaped defect voids. Fibrin gels are derived from the physiological blood-clot formation and are clinically applied for wound closure. Within this work, comparisons of different fibrin glue formulations with the commercial BioGlue® were assessed, which highlighted the need for good biocompatibility when applied on cartilage tissue in order to achieve satisfying long-term integration. Fibrin gel formulations can be adapted with regard to their long-term stability and when applied on cartilage disc/ring constructs improved integrative repair is observable. The kinetic of repairing processes was investigated in fibrin-treated cartilage composites as part of this work. After three days in vitro cultivation, deposited extracellular matrix (ECM) was obvious at the glued interface that increased further over time. Interfacial cell invasion from the surrounding native cartilage was detected from day ten of tissue culture. The ECM formation relies on molecular factors, e.g., as was shown representatively for ascorbic acid, and contributes to increasing integration strengths over time. The experiments performed with fibrin revealed that the treatment with a biocompatible adhesive that allows cartilage neosynthesis favors lateral cartilage integration in the long term. However, fibrin has limited immediate bonding strength, which is disadvantageous for use on articular cartilage that is subject to high mechanical stress. The continuing aim of this thesis was to further develop adhesive mechanisms and new adhesive hydrogels that retain the positive properties of fibrin but have an increased immediate bonding strength.
Two different photochemical approaches with the advantage of on-demand bonding were tested. Such treatment potentially eases the application for the professional user. First, an UV light induced crosslinking mechanism was transferred to fibrin glue to provide additional bonding strength. For this, the cartilage surface was functionalized with highly reactive light-sensitive diazirine groups, which allowed additional covalent bonds to the fibrin matrix and thus increased the adhesive strength. However, the disadvantages of this approach were the multi-step bonding reactions, the need for enzymatic pretreatment of the cartilage, expensive reagents, potential UV-light damage, and potential toxicity hazards. Due to the mentioned disadvantages, no further experiments, including long-term culture, were carried out. A second photosensitive approach focused on blue light induced crosslinking of fibrinogen (RuFib) via a photoinitiator molecule instead of using thrombin as a crosslinking mediator like in normal fibrin glue. The used ruthenium complex allowed inter- and intramolecular dityrosine binding of fibrinogen molecules. The advantage of this method is a one-step curing of fibrinogen via visible light that further achieved higher adhesive strengths than fibrin. In contrast to diazirine functionalization of cartilage, the ruthenium complex is of less toxicological concern. However, after in vitro cultivation of the disc/ring constructs, there was a decrease in integration strength. Compared to fibrin, a reduced cartilage synthesis was observed at the defect. It is also disadvantageous that a direct adjustment of the adhesive can only be made via protein concentration, since fibrinogen is a natural protein that has a fixed number of tyrosine binding sites without chemical modification.
An additional cartilage adhesive was developed that is based on a mussel-inspired adhesive mechanism in which reactivity to a variety of substrates is enabled via free DOPA amino acids. DOPA-based adhesion is known to function in moist environments, a major advantage for application on water-rich cartilage tissue surrounded by synovial liquid. Reactive DOPA groups were synthetically attached to a polymer, here POx, to allow easy chemical modifiability, e.g. insertion of hydrolyzable ester motifs for tunable degradation. The possibility of preparing an adhesive hybrid hydrogel of POx in combination with fibrinogen led to good cell compatibility as was similarly observed with fibrin, but with increased immediate adhesive strength. Degradation could be adjusted by the amount of ester linkages on the POx and a direct influence of degradation rates on the development of integration in the in vitro model could be shown.
Hydrogels are well suited to fill defect gaps and immediate integration can be achieved via adhesive properties. The results obtained show that for the success of long-term integration, a good ability of the adhesive to take up synthesized ECM components and cells to enable regeneration is required. The degradation kinetics of the adhesive must match the remodeling process to avoid intermediate loss of integration power and to allow long-term firm adhesion to the native tissue.
Hydrogels are not only important as adhesives for smaller lesions, but also for filling large defect volumes and populating them with cells to produce tissue engineered cartilage. Many different hydrogel types suitable for cartilage synthesis are reported in the literature. A long-term stable fibrin formulation was tested in this work not only as an adhesive but also as a bulk hydrogel construct. Agarose is also a material widely used in cartilage tissue engineering that has shown good cartilage neosynthesis and was included in integration assessment. In addition, a synthetic hyaluronic acid-based hydrogel (HA SH/P(AGE/G)) was used. The disc/ring construct was adapted for such experiments and the inner lumen of the cartilage ring was filled with the respective hydrogel. In contrast to agarose, fibrin and HA-SH/P(AGE/G) gels have a crosslink mechanism that led to immediate bonding upon contact with cartilage during curing. The enhanced cartilage neosynthesis in agarose compared to the other hydrogel types resulted in improved integration during in vitro culture. This shows that for the long-term success of a treatment, remodeling of the hydrogel into functional cartilage tissue is a very high priority. In order to successfully treat larger cartilage defects with hydrogels, new materials with these properties in combination with chemical modifiability and a direct adhesion mechanism are one of the most promising approaches.
Prevention of the effectiveness of anti-tumor immune responses is one of the canonical cancer hallmarks. The competition for crucial nutrients within the tumor microenvironment (TME) between cancer cells and immune cells creates a complex interplay characterized by metabolic deprivation. Extensive efforts have recently been made to understand better the dynamic interactions between cancer cells and surrounding immune cells. Paradoxically, both cancer cells and activated T cells are metabolically dependent on glycolysis, even in the presence of oxygen, a metabolic process known as the Warburg effect. The intestinal microbial community delivers various types of small molecules that can potentially augment the functional capabilities of the host immune system. Currently, several studies are trying to explore the complex functional relationship between the metabolites secreted by the human microbiome and anti-tumor immunity. Recently, it has been shown that a diverse array of commensal bacteria synthetizes bioactive molecules that enhance the efficacy of cancer immunotherapy, including immune checkpoint inhibitor (ICI) treatment and adoptive cell therapy with chimeric antigen receptor (CAR) T cells. In this review, we highlight the importance of commensal bacteria, particularly of the gut microbiota-derived metabolites that are capable of shaping metabolic, transcriptional and epigenetic processes within the TME in a therapeutically meaningful way.
The cancer stem cell hypothesis is a cancer development model which elicited great interest in the last decades stating that cancer heterogeneity arises from a stem cell through asymmetrical division. The Cancer Stem Cell subset is described as the only population to be tumorigenic and having the potential to renew. Conventional therapy often fails to eradicate CSC resulting in tumor relapse. Consequently, it is of great inter-est to eliminate this subset of cells to provide the best patient outcome. In the last years several approaches to target CSC were developed, one of them being immunotherapeu-tic targeting with antibodies. Since markers associated with CSC are also expressed on normal stem cells or healthy adjacent tissue in colorectal cancer, dual targeting strate-gies are preferred over targeting only a single antigen. Subsequently, the idea of dual targeting two CSC markers in parallel by a newly developed split T cell-engaging anti-body format termed as Hemibodies emerged. In a preliminary single cell RNA sequenc-ing analysis of colorectal cancer cells CD133, CD24, CD166 and CEA were identified as suitable targets for the combinatorial targeting strategy. Therefore, this study focused on trispecific and trivalent Hemibodies comprising a split binding moiety against CD3 and a binding moiety against either CD133, CD24, CD166 or CEA to overcome the occurrence of resistance and to efficiently eradicate all tumor cells including the CSC compartment. The study showed that the Hemibody combinations CD133xCD24, CD133xCD166 and CD133xCEA are able to eliminate double positive CHO cells with high efficacy while having a high specificity indicated by no killing of single antigen positive cells. A thera-peutic window ranging between one to two log levels could be achieved for all combina-tions mentioned above. The combinations CD133xCD24 and CD133xCD166 further-more proved its efficacy and specificity on established colorectal cancer cell lines. Be-sides the evaluation of specificity and efficacy the already introduced 1st generation of Hemibodies could be improved into a 2nd generation Hemibody format with increased half-life, stability and production yield. In future experiments the applicability of above-mentioned Hemibodies will be proven on patient-derived micro tumors to also include variables like tumor microenvironment and infiltration.
At the beginning of the COVID-19 pandemic, patients with primary and secondary immune disorders — including patients suffering from cancer — were generally regarded as a high-risk population in terms of COVID-19 disease severity and mortality. By now, scientific evidence indicates that there is substantial heterogeneity regarding the vulnerability towards COVID-19 in patients with immune disorders. In this review, we aimed to summarize the current knowledge about the effect of coexistent immune disorders on COVID-19 disease severity and vaccination response. In this context, we also regarded cancer as a secondary immune disorder. While patients with hematological malignancies displayed lower seroconversion rates after vaccination in some studies, a majority of cancer patients’ risk factors for severe COVID-19 disease were either inherent (such as metastatic or progressive disease) or comparable to the general population (age, male gender and comorbidities such as kidney or liver disease). A deeper understanding is needed to better define patient subgroups at a higher risk for severe COVID-19 disease courses. At the same time, immune disorders as functional disease models offer further insights into the role of specific immune cells and cytokines when orchestrating the immune response towards SARS-CoV-2 infection. Longitudinal serological studies are urgently needed to determine the extent and the duration of SARS-CoV-2 immunity in the general population, as well as immune-compromised and oncological patients.
Ziel dieser Arbeit war es, den Einfluss psychosozialer Belastungsfaktoren auf den Verlauf einer Stammzelltransplantation zu untersuchen. Die primäre Fragestellung war, ob sich das Vorliegen einer posttraumatischen Belastungsstörung (PTSD) auf die Dauer der Immunrekonstitution, gemessen an der Aplasiezeit, auswirkt. Der Untersuchung liegen Daten aus der Medizinischen Klinik und Poliklinik II des Universitätsklinikums Würzburg zugrunde, die im Rahmen einer monozentrischen Querschnittsstudie erhoben wurden. An der Studie nahmen 50 Patienten mit der Diagnose eines Multiplen Myeloms teil, die am Tag ihrer ersten autologen Stammzelltransplantation befragt wurden. Anhand von Fragebögen konnten die Patienten Angaben zu ihrer individuellen psychischen Belastung machen. Für die statistische Auswertung wurden die Angaben aus dem NCCN-Distress-Thermometer und dem PCL-C ausgewertet.
Ruxolitinib (RUX) is approved for the treatment of steroid-refractory acute and chronic graft versus host disease (GvHD). It is predominantly metabolized via cytochrome P450 (CYP) 3A4. As patients with GvHD have an increased risk of invasive fungal infections, RUX is frequently combined with posaconazole (POS), a strong CYP3A4 inhibitor. Knowledge of RUX exposure under concomitant POS treatment is scarce and recommendations on dose modifications are inconsistent. A physiologically based pharmacokinetic (PBPK) model was developed to investigate the drug–drug interaction (DDI) between POS and RUX. The predicted RUX exposure was compared to observed concentrations in patients with GvHD in the clinical routine. PBPK models for RUX and POS were independently set up using PK-Sim\(^®\) Version 11. Plasma concentration-time profiles were described successfully and all predicted area under the curve (AUC) values were within 2-fold of the observed values. The increase in RUX exposure was predicted with a DDI ratio of 1.21 (C\(_{max}\)) and 1.59 (AUC). Standard dosing in patients with GvHD led to higher RUX exposure than expected, suggesting further dose reduction if combined with POS. The developed model can serve as a starting point for further simulations of the implemented DDI and can be extended to further perpetrators of CYP-mediated PK-DDIs or disease-specific physiological changes.
(1) Background: molecular tumor boards (MTBs) are crucial instruments for discussing and allocating targeted therapies to suitable cancer patients based on genetic findings. Currently, limited evidence is available regarding the regional impact and the outreach component of MTBs; (2) Methods: we analyzed MTB patient data from four neighboring Bavarian tertiary care oncology centers in Würzburg, Erlangen, Regensburg, and Augsburg, together constituting the WERA Alliance. Absolute patient numbers and regional distribution across the WERA-wide catchment area were weighted with local population densities; (3) Results: the highest MTB patient numbers were found close to the four cancer centers. However, peaks in absolute patient numbers were also detected in more distant and rural areas. Moreover, weighting absolute numbers with local population density allowed for identifying so-called white spots—regions within our catchment that were relatively underrepresented in WERA MTBs; (4) Conclusions: investigating patient data from four neighboring cancer centers, we comprehensively assessed the regional impact of our MTBs. The results confirmed the success of existing collaborative structures with our regional partners. Additionally, our results help identifying potential white spots in providing precision oncology and help establishing a joint WERA-wide outreach strategy.
Li-Fraumeni-syndrome (LFS) is a rare, highly penetrant cancer predisposition syndrome (CPS) caused by pathogenic variants (PVs) in TP53. Physical activity (PA) and a Mediterranean diet lead to cancer reduction or survival benefits and increased quality of life (QoL), but this is yet unstudied among LFS. TP53 PV carriers (PVC) and their relatives were questioned on dietary patterns (Mediterranean Diet Adherence Screener), PA (Freiburg Questionnaire), QoL (Short-form-Health-Survey-12), smoking, alcohol consumption and perception of cancer risk in a German bi-centric study from March 2020–June 2021. The study enrolled 70 PVC and 43 relatives. Women compared to men (6.49 vs. 5.38, p = 0.005) and PVC to relatives (6.59 vs. 5.51; p = 0.006) showed a healthier diet, associated with participation in surveillance (p = 0.04) and education (diet p = 0.02 smoking p = 0.0003). Women smoked less (2.91 vs. 5.91 packyears; p = 0.03), psychological well-being was higher among men (SF-12: males 48.06 vs. females 41.94; p = 0.004). PVC rated their own cancer risk statistically higher than relatives (72% vs. 38%, p < 0.001) however, cancer risk of the general population was rated lower (38% vs. 70%, p < 0.001). A relative’s cancer-related death increased the estimated personal cancer risk (p = 0.01). The possibilities of reducing cancer through self-determined health behavior among PVC and relatives has not yet been exhausted. Educating families with a CPS on cancer-preventive behavior requires further investigation with regard to acceptance and real-life implementation.
In recent years, it has become increasingly apparent that bone marrow (BM) failures and myeloid malignancy predisposition syndromes are characterized by a wide phenotypic spectrum and that these diseases must be considered in the differential diagnosis of children and adults with unexplained hematopoiesis defects. Clinically, hypocellular BM failure still represents a challenge in pathobiology-guided treatment. There are three fundamental topics that emerged from our review of the existing data. An exogenous stressor, an immune defect, and a constitutional genetic defect fuel a vicious cycle of hematopoietic stem cells, immune niches, and stroma compartments. A wide phenotypic spectrum exists for inherited and acquired BM failures and predispositions to myeloid malignancies. In order to effectively manage patients, it is crucial to establish the right diagnosis. New theragnostic windows can be revealed by exploring BM failure pathomechanisms.
Complement 1q/tumor necrosis factor-related proteins (CTRPs): structure, receptors and signaling
(2023)
Adiponectin and the other 15 members of the complement 1q (C1q)/tumor necrosis factor (TNF)-related protein (CTRP) family are secreted proteins composed of an N-terminal variable domain followed by a stalk region and a characteristic C-terminal trimerizing globular C1q (gC1q) domain originally identified in the subunits of the complement protein C1q. We performed a basic PubMed literature search for articles mentioning the various CTRPs or their receptors in the abstract or title. In this narrative review, we briefly summarize the biology of CTRPs and focus then on the structure, receptors and major signaling pathways of CTRPs. Analyses of CTRP knockout mice and CTRP transgenic mice gave overwhelming evidence for the relevance of the anti-inflammatory and insulin-sensitizing effects of CTRPs in autoimmune diseases, obesity, atherosclerosis and cardiac dysfunction. CTRPs form homo- and heterotypic trimers and oligomers which can have different activities. The receptors of some CTRPs are unknown and some receptors are redundantly targeted by several CTRPs. The way in which CTRPs activate their receptors to trigger downstream signaling pathways is largely unknown. CTRPs and their receptors are considered as promising therapeutic targets but their translational usage is still hampered by the limited knowledge of CTRP redundancy and CTRP signal transduction.
Die CDI ist weltweit die häufigste Ursache der antibiotikaassoziierten nosokomialen Diarrhoe. Sie geht mit steigender Inzidenz, Hospitalisierung und hohen Behandlungskosten in Milliardenhöhe einher. Auch im ambulanten Sektor werden steigende Infektionszahlen gemeldet, die nicht nur ein Problem für die Krankenhäuser, sondern auch für die Pflegeeinrichtungen darstellen.
Ziel dieser Arbeit war es, retrospektiv die CDI-Fälle des Klinikums Aschaffenburg-Alzenau (ausgenommen Kinderklinik) im Zeitraum 01.01.2013 - 25.05.2015 zu erfassen und die antibiotische Initialtherapie zu ermitteln. Für die Diagnose einer CDI wurde ein positiver Toxinnachweis in der Stuhlkultur vorausgesetzt. Im weiteren Fokus standen die Rezidivhäufigkeit, die antibiotische Folgetherapie, die Komplikationen bis hin zu den Todesursachen sowie Präventionsmaßnahmen.
Im o.g. Zeitraum waren 299 Patienten und Patientinnen mit einer CDI hospitalisiert. Das mittlere Alter lag bei 73,8 Jahren. Es handelte sich in der Mehrzahl um multimorbide und immunsupprimierte Patienten und Patientinnen. 61% waren antibiotisch vorbehandelt. Am häufigsten verwendet wurden Breitbandpenicilline (36%), Cephalosporine der 3. Generation (12%) und Fluorchinolone (10%). Über 1/3 der Patienten und Patientinnen wurde mit Mehrfachkombinationen behandelt und bei 2% war eine zytostatische Behandlung vorausgegangen. In der Initialtherapie der CDI kam bei fast der Hälfte Erkrankten (47%) Metronidazol zur Anwendung. Die Rezidivrate lag bei 20%, Mehrfachrezidive traten bei 5,7% auf. Die antibiotische Folgetherapie der CDI erfolgte bei 39% der Patienten und Patientinnen mit Vancomycin oder Fidaxomicin entsprechend den damals geltenden Empfehlungen leitlinienkonform. Rund ¼ aller Erkrankten verstarben, davon 17% CDI-assoziiert. Der fäkale Stuhltransfer, der ab dem 2. Rezidiv empfohlen wird, und die Genotypisierung bei Mehrfachrezidiven wurde in keinem Fall durchgeführt.
2021 wurde die CDI-Behandlungsleitlinie der ESCMID aktualisiert. Statt dem Einsatz von Metronidazol werden nun Fidaxomicin oder Vancomycin, in Rezidivsituationen die Standardantibiose um den Antikörper Bezlotoxumab ergänzt. 06/2023 erschien die Konsultationsfassung der S2k-Leitlinie “Gastrointestinale Infektionen und Morbus Whipple” der DGVS. Die Empfehlungen gleichen sich.
Es kann festgehalten werden, dass die CDI auch im Klinikum Aschaffenburg-Alzenau ein ernstes Problem darstellt, das Präventionsmaßnahmen bedarf. Die Rezidiv- und
Todesraten sind hoch.
In dieser Arbeit konnte bestätigt werden, dass der unbedachte Einsatz von Antibiotika ein wichtiger Hauptrisikofaktor für die Entstehung einer CDI ist. Daher sollte die Indikation für eine antibiotische Therapie streng gestellt werden. Die Daten zeigen ferner, dass die Umsetzung aktueller Leitlinienempfehlungen nicht oder zeitlich verzögert erfolgte.
Seit der Etablierung und Umsetzung des ABS 2017 am Klinikum Aschaffenburg-Alzenau konnte ein Rückgang der CDI um 21% verzeichnet werden. Ein ABS ist eine Möglichkeit die konsequente Anwendung aktueller Empfehlungen im klinischen Alltag umzusetzen und so zu einer höheren Erfolgsrate der Behandlung und einer niedrigeren Rezidivrate beizutragen. Die Umsetzung einer gezielten frühen Diagnostik, Schutz- und Isoliermaßnahmen, Surveillance und regelmäßige Fort- und Weiterbildung der Mitarbeiter*innen sind weitere wichtige Bausteine, die zur Prävention der CDI beitragen.
In den letzten Jahrzehnten haben Inzidenz und Prävalenz von GEP NET deutlich zugenommen (Yao et al. 2008). Den SSTR kommt eine entscheidende Rolle bei zahlreichen etablierten Therapieverfahren zu. Allerdings stoßen die meisten Therapien bei G3 Tumoren oder bei langfristigem Einsatz an ihre Grenzen, was die Etablierung neuer, molekular zielgerichteter Therapien notwendig macht. Die Inhibition des Wnt-Signalweges stellt einen möglichen Ansatzpunkt für Therapien dar.
Ziel dieser Arbeit war es die Wirkung der Wnt-Modulatoren Quercetin und Lithiumchlorid auf die Wnt-Aktivität sowie die Expression von Somatostatinrezeptoren und CXCR4 in den neuroendokrinen Tumorzelllinien QGP-1 und BON-1 zu untersuchen.
Durch Real-Time PCR, Western Blots und Immunhistochemie wurden die Effekte auf RNA-, und Proteinebene sowie morphologisch analysiert und ausgewertet.
An den verwendeten Zelllinien konnte gezeigt werden, dass Quercetin die Wnt-Signalgebung inhibierte, die SSTR-Expression steigerte und die CXCR4-Expression senkte. Lithiumchlorid bewirkte eine Wnt-Aktivierung und konnte über diesen Weg eine gesteigerte Expression von CXCR4 erzielen.
Es konnte gezeigt werden, dass ein Zusammenhang zwischen der Aktivität des Wnt- Signalwegs und der Befähigung der GEP-NET Zelllinien zur SSTR- und CXCR4-Expression bestand.
Die Wnt-Inhibierung kann über den Effekt der Steigerung von SSTR Teil neuer Therapiestrategien sein. So ist z.B. eine „add-on“ Therapie von Wnt-Inhibitoren wie Quercetin zusammen mit der PRRT denkbar.
T-Zell-aktivierende Formate, wie BiTE (bispecific T-cell engagers) Antikörper und CAR T Zellen haben in den vergangen Jahren die Therapiemöglichkeiten für Tumorpatienten erweitert. Diese Therapeutika verknüpfen T-Zellen mit malignen Zellen über je ein spezifisches Oberflächenmolekül und initiieren, über eine T-Zell-vermittelte Immunantwort, die Lyse der Tumorzelle. Tumorspezifische Antigene sind jedoch selten. Häufig werden Proteine adressiert, die neben den Tumorzellen auch auf gesunden Zellen exprimiert werden. Die Folgen sind toxische Effekte abseits der Tumorzellen auf Antigen-positiven gesunden Zellen (on target/off tumor), welche nicht nur die Dosis des Therapeutikums und dessen Effektivität limitieren, sondern zu geringen bis letalen Begleiterscheinungen führen können. Der Bedarf an effektiven Therapieformen mit geringen Nebenwirkungen ist folglich immer noch sehr hoch. Diese Lücke soll durch ein neues Antikörperformat, sogenannten Hemibodies, geschlossen werden. Hemibodies sind eine neue Klasse von T-Zell-aktivierenden Antikörpern, die sich gegen eine Antigenkombination und nicht einzelne Antigene auf Tumorzellen richten. Sie bestehen aus zwei komplementären Molekülen mit je einer Antigen-bindenden Sequenz, die entweder mit der leichten (VL) oder der schweren (VH) Kette eines T-Zell-aktivierenden anti CD3 Antikörpers fusioniert ist. Nur wenn beide Hemibody-Fragmente gleichzeitig in unmittelbarer Nähe an ihr jeweiliges Antigenepitop auf der Tumorzelle binden, komplementieren die beiden Antikörperkonstrukte über das geteilte anti-CD3 und bilden einen trivalenten T Zell aktivierenden Komplex aus. Diese funktionale Einheit rekrutiert T-Zellen zur Tumorzelle und induzierte die T-Zell-vermittelte Lyse der malignen Zelle.
Im Rahmen der vorliegenden Arbeit wurden geeignete Antigenkombinationen identifiziert und die erste effektive und spezifische Hemibody-basierte Immuntherapie gegen das Multiple Myelom (MM), ohne Nebenwirkungen auf Antigen-einfach-positiven gesunden Zellen, entwickelt. Basierend auf einer umfangreichen Analyse von Kandidaten-Antigenen wurden Kombinationen aus bekannten MM Zielmolekülen, wie BCMA, CD38, CD138, CD229 und SLAMF7, und für das MM unbekannte Oberflächenmolekülen, wie CHRM5 und LAX1, untersucht. Gegen die vielversprechendsten Antigene wurden Hemibodies entwickelt und produziert. Im Zusammenhang mit Analysen zur Produzierbarkeit sowie biochemischen und funktionalen Charakterisierungen, konnte aus 75 initialen Hemibody-Kombinationen drei Kombinationen mit geeigneten Eigenschaften identifiziert werden. Die Bindung von zwei Hemibody-Partnern auf der Oberfläche der MM Zelle führte zur Ausbildung eines trivalenten T-Zell-rekrutierenden Komplexes. Dieser initiierte nachfolgend über eine T-Zell-vermittelte Immunantwort die spezifische Lyse der malignen Zellen, ohne die Viabilität von Antigen-einfach-positiven gesunden Körper- oder Effektor-Zellen zu beeinflussen. Zusätzlich führte eine Hemibody-Therapie in vivo in einem NOD SCID MM-Mausmodel innerhalb von 7 Tagen zur kompletten Remission der MM Zellen. Diese Daten zeigten Hemibodies als ein neues, sehr vielversprechendes Antikörperformat für eine effektive und tumorspezifische Immuntherapie mit potentiell geringen Nebenwirkungen.
Chemotherapy, the standard treatment for pancreatic ductal adenocarcinoma (PDAC), has only a modest effect on the outcome of patients with late-stage disease. Investigations of the genetic features of PDAC have demonstrated a frequent occurrence of mutations in genes involved in homologous recombination (HR), especially in the breast cancer susceptibility gene 2 (BRCA2). Olaparib, a poly(ADP-ribose) polymerase (PARP) inhibitor, is approved as a maintenance treatment for patients with advanced PDAC with germline BRCA1/2 mutations following a platinum-containing first-line regimen. Limitations to the use of PARP inhibitors are represented by the relatively small proportion of patients with mutations in BRCA1/2 genes and the modest capability of these substances of inducing objective response. We have previously shown that pancreatic cancer with BRCA2 mutations exhibits a remarkably enhanced sensitivity towards tumor-necrosis-factor-related apoptosis-inducing ligand (TRAIL) receptor-stimulating agents. We thus aimed to investigate the effect of combined treatment with PARP inhibitors and TRAIL receptor-stimulating agents in pancreatic cancer and its dependency on the BRCA2 gene status. The respective effects of TRAIL-targeting agents and the PARP inhibitor olaparib or of their combination were assessed in pancreatic cancer cell lines and patient-derived organoids. In addition, BRCA2-knockout and -complementation models were investigated. The effects of these agents on apoptosis, DNA damage, cell cycle, and receptor surface expression were assessed by immunofluorescence, Western blot, and flow cytometry. PARP inhibition and TRAIL synergized to cause cell death in pancreatic cancer cell lines and PDAC organoids. This effect proved independent of BRCA2 gene status in three independent models. Olaparib and TRAIL in combination caused a detectable increase in DNA damage and a concentration-dependent cell cycle arrest in the G2/M and S cell cycle phases. Olaparib also significantly increased the proportion of membrane-bound death receptor 5. Our results provide a preclinical rationale for the combination of PARP inhibitors and TRAIL receptor agonists for the treatment of pancreatic cancer and suggest that the use of PARP inhibitors could be extended to patients without BRCA2 mutations if used in combination with TRAIL agonists.
This non-interventional, prospective phase IV trial evaluated trabectedin in patients with soft tissue sarcoma (STS) in real-life clinical practice across Germany. The primary endpoints were progression-free survival (PFS) rates at 3 and 6 months, as defined by investigators. Overall, 128 patients from 19 German sites were evaluated for efficacy and 130 for safety. Median age was 58.5 years (range: 23–84) and leiomyosarcoma was the most frequent histotype (n = 45; 35.2%). Trabectedin was mostly used as second/third-line treatment (n = 91; 71.1%). Median PFS was 5.2 months (95% CI: 3.3–6.7), with 60.7% and 44.5% of patients free from progression at 3 and 6 months, respectively. Median overall survival was 15.2 months (95% CI: 9.6–21.4). One patient achieved a complete and 14 patients a partial response, conferring an objective response rate of 11.7%. Decreases in white blood cells (27.0% of patients), platelets (16.2%) and neutrophils (13.1%) and increased alanine aminotransferase (10.8%) were the most common trabectedin-related grade 3/4 adverse drug reactions. Two deaths due to pneumonia and sepsis were considered trabectedin-related. Trabectedin confers clinically meaningful activity in patients with multiple STS histotypes, comparable to that previously observed in clinical trials and other non-interventional studies, and with a manageable safety profile.
Tumor necrosis factor (TNF) receptor associated factor-2 (TRAF2) has been originally identified as a protein interacting with TNF receptor 2 (TNFR2) but also binds to several other receptors of the TNF receptor superfamily (TNFRSF). TRAF2, often in concert with other members of the TRAF protein family, is involved in the activation of the classical NFκB pathway and the stimulation of various mitogen-activated protein (MAP) kinase cascades by TNFRSF receptors (TNFRs), but is also required to inhibit the alternative NFκB pathway. TRAF2 has also been implicated in endoplasmic reticulum (ER) stress signaling, the regulation of autophagy, and the control of cell death programs. TRAF2 fulfills its functions by acting as a scaffold, bringing together the E3 ligase cellular inhibitor of apoptosis-1 (cIAP1) and cIAP2 with their substrates and various regulatory proteins, e.g., deubiquitinases. Furthermore, TRAF2 can act as an E3 ligase by help of its N-terminal really interesting new gene (RING) domain. The finding that TRAF2 (but also several other members of the TRAF family) interacts with the latent membrane protein 1 (LMP1) oncogene of the Epstein–Barr virus (EBV) indicated early on that TRAF2 could play a role in the oncogenesis of B-cell malignancies and EBV-associated non-keratinizing nasopharyngeal carcinoma (NPC). TRAF2 can also act as an oncogene in solid tumors, e.g., in colon cancer by promoting Wnt/β-catenin signaling. Moreover, tumor cell-expressed TRAF2 has been identified as a major factor-limiting cancer cell killing by cytotoxic T-cells after immune checkpoint blockade. However, TRAF2 can also be context-dependent as a tumor suppressor, presumably by virtue of its inhibitory effect on the alternative NFκB pathway. For example, inactivating mutations of TRAF2 have been associated with tumor development, e.g., in multiple myeloma and mantle cell lymphoma. In this review, we summarize the various TRAF2-related signaling pathways and their relevance for the oncogenic and tumor suppressive activities of TRAF2. Particularly, we discuss currently emerging concepts to target TRAF2 for therapeutic purposes.
Die molekulare Chimärismusdiagnostik stellt einen essenziellen Teil der Therapieüberwachung nach allogener HSZT dar. In der Uniklinik Würzburg wird hierbei mittels qPCR eines Panels von 21 Allelen eine Informativität von 95 % und eine Sensitivität von 0,1-0,01 % erreicht. Ziel der Arbeit war eine Optimierung dieser in unserem Labor angewandten Methode zur Chimärismusanalyse in puncto Sensitivität und Informativität.
Es wurde untersucht, ob durch Steigerung des DNA-Inputs in die qPCR eine Sensitivitätserhöhung erzielt werden kann, ohne dass PCR-Inhibition auftritt. Dabei erwies sich ein DNA-Input von 250 ng als ideal für eine verlässlichere Detektion von 0,01 % Empfängerzellen. PCR-Inhibition trat nicht auf. Zur Deckung des damit einhergehendem erhöhten DNA-Bedarf wurden verschiedene Elutionsmethoden der DNA-Extraktion verglichen, wobei durch Extraktion mit dem QIAamp DNA Blood Midi-Kit und Elution mit 2 x 200 μl AE-Puffer der höchste DNA-Ertrag gewonnen wurde.
Zur Erhöhung der Informativität wurde die Anwendbarkeit eines Primersets für qPCR des SNP rs713753 evaluiert. Hierbei zeigte sich eine mäßige Eignung: Beide Allele des SNP gemeinsam ergaben eine gute Informativität für Empfängerdiskriminierung von 37,5 %. Die qPCR-Effizienzen der lokusspezifischen Referenz und des Allels C waren nahezu optimal, die des Allels T lag lediglich bei 0,87. Die Sensitivität der spezifischen Allele lag bei max. 0,1 %. Sofern auch hier eine Sensitivitätssteigerung durch Erhöhung des DNA-Inputs in die qPCR ohne Auftreten unspezifischer Amplifikation möglich ist, wäre eine Integration der qPCR des SNP rs713753 in die Routinediagnostik denkbar.
Zusammenfassend ist eine Optimierung der in unserem Labor angewandten Methode zur Chimärismusdiagnostik hinsichtlich Sensitivität und Informativität durchaus möglich. Eine Erhöhung des DNA-Inputs ist dabei am simpelsten umsetzbar; zur Etablierung weiterer Allele bedarf es zusätzlicher Experimente.
Aspergillus fumigatus ist ein opportunistisches fungales Humanpathogen, das ein breites Erkrankungsspektrum von der invasiven Aspergillose (IA) in immunkompromittierten Patienten bis zu einer Reihe von Hypersensitivitätserkrankungen in immunkompetenten Individuen hervorrufen kann. Die Diagnostik für A. fumigatus assoziierte Krankheitsbilder beruht auf mehreren diagnostischen Tests, die auch in ihrer Kombination oft zu späten und unzuverlässigen Diagnosen führen, was wiederum zu einer suboptimalen Patientenversorgung, erhöhter Mortalität und gesteigerten Kosten für das Gesundheitssystem führt. Es besteht daher die unbedingte Notwendigkeit, neue und bessere diagnostische Tests zur Detektion von A. fumigatus zu entwickeln. T Zell Assays sind vielversprechende, innovative diagnostische Tests, die bereits für andere Infektionskrankheiten in der Routinediagnostik eingesetzt werden. Erste Versuche wurden bereits unternommen, diese Assays auch für A. fumigatus assoziierte Erkrankungen einzusetzen. Die gängigsten, auf mononukleären Zellen des peripheren Blutes (PBMC)-basierten T Zell Assays sind der Enzyme-linked Immunosorbent Assay (ELISA), Enzyme-linked Immuno Spot Assay (ELISPOT) und die Durchflusszytometrie. Das Ziel dieser Dissertation war die Entwicklung eines klinisch einsetzbaren T-Zell-Assays für A. fumigatus assoziierte Erkrankungen.
Die in der Literatur beschriebenen Assays zeigten in unseren Experimenten bei der Anwendung für mykologische Fragestellungen eine hohe Suszeptibilität gegenüber bereits kurzen präanalytischen Lagerzeiten und Krykonservierung, was einen klinischen Einsatz erschwerte. Wir entwickelten deshalb einen Vollblut basierten ELISA (VB-ELISA) mit dualer Kostimulation (α-CD28 und α-CD49d), hoher Reproduzierbarkeit und verbesserter Robustheit gegenüber präanalytischen Einflussfaktoren. Der VB ELISA konnte hohe Differenzen zwischen Typ 1 T Helferzellen (Th1) , Th2 und Th17 Zytokinkonzentrationen bei Patienten mit Aspergillus assoziierten Hypersensitivitätskrankheitsbildern und Kontrollpatienten feststellen. Um zu testen, ob dieser Anstieg auf die Erkrankung zurückzuführen ist oder auch bei hoher Aspergillus-Umweltexposition vorzufinden ist, wurde der Assay in Aspergillus exponierten gesunden ökologischen Landwirten getestet. In dieser Gruppe fanden wir ebenfalls eine erhöhte Th1 und Th2 Expansion und Zytokinsekretion gegenüber gesunden Kontrollspendern, jedoch wurde nur ein geringer Anstieg des Th17 Signalzytokines IL-17 detektiert. Die Detektion von IL-17 im VB-ELISA in Kombination mit anderen Zytokinmarkern ist daher ein vielversprechender Biomarker für die Diagnose von A. fumigatus assoziierten Hypersensitivitätserkrankungen.
Neben diesen Hypersensitivitätserkrankungen haben wir den VB-ELISA auch in immunkompromittierten Patienten nach allogener Stammzelltransplantation (alloSZT), einer Hochrisikogruppe für die IA und die durch das humane Cytomegalovirus (HCMV) ausgelöste Zytomegalie, evaluiert. Während in unserer monozentrischen Pilotstudie aufgrund der geringen Inzidenz keine Evaluation an IA-Patienten erfolgen konnte, wurde mittels VB-ELISA eine hohe Konkordanz der HCMV-spezifischen T Zell Antwort mit der HCMV Serologie sowie eine vergleichbare Leistung zum ELISPOT, dem am häufigsten eingestetzen Assay für diese Fragestellung, festgestellt.
Zusammenfassend haben wir mit dem VB ELISA einen vielversprechenden und breitflächig im Spektrum A. fumigatus assoziierter Erkrankungen einsetzbaren T Zell Assay entwickelt, der in der Zukunft in großen Studien mit klar definierten Patientenkohorten getestet werden sollte. Auf Grund von Daten aus Folgestudien, die auf dieser Arbeit basieren, ist des Weiteren davon auszugehen, dass der VB-ELISA auf Grund seiner Stärken potenziell in einer Vielzahl von Anwendungsgebieten und Pathogenen (eine Folgestudie mit SARS-CoV-2 wurde vor kurzem veröffentlicht) universell eingesetzt werden kann. Neben der Immundiagnostik für diverse Infektionserkrankungen könnte der Assay außerdem für T Zell Antworten auf Vakzinierungen und Immuntherapien, in vivo Experimente und in vitro Toxizitätstests verwendet werden.
Die Nicht-alkoholische Fettlebererkrankung (NAFLD) ist eine der häufigsten chronischen Lebererkrankungen der westlichen Welt. Die Pathogenese der Erkrankung ist noch nicht vollständig erforscht und wirksame medikamentöse Therapien sind bisher nicht zugelassen. Wachsende Evidenz zeigt, dass das Interleukin-6-Typ-Zytokin Oncostatin M (OSM) eine wichtige Rolle in der Pathogenese der NAFLD spielt. Die japanische Arbeitsgruppe um Komori et al. zeigte an OSM-Rezeptor-β-defizienten (Osmr-KO-) Mäusen sowie durch OSM-Behandlung von genetisch und ernährungsbedingt adipösen Mäusen, dass OSM vor einer hepatischen Steatose und metabolischer Komorbidität schützen kann. Andere Publikationen suggerieren, dass OSM an NAFLD-Entwicklung und -Progression beteiligt ist, indem es die Expression von Genen der β-Oxidation und Very-Low-Density-Lipoprotein (VLDL-) Sekretion reprimiert und die Expression profibrogenetischer Gene fördert. Low-Density-Lipoprotein-Rezeptor-defiziente- (Ldlr-KO-) Mäuse sind seit Langem als Atherosklerose-Modell etabliert und wurden zuletzt auch als physiologisches Modell für NAFLD identifiziert.
Um die Rolle von OSM in der NAFLD-Pathogenese zu beleuchten, wurden Osmr-KO-Mäuse auf Wildtyp- (WT-) und Ldlr-KO-Hintergrund untersucht, die über 12 Wochen eine fett- und cholesterinreiche Western Diet erhielten und anschließend für die Organentnahme geopfert wurden. Im Vorfeld dieser Arbeit wurden Körpergewicht, Blutglukose, Serum-Cholesterin und Lebergewicht der Tiere gemessen. Hierbei zeigte sich ein erhöhtes Körpergewicht, unveränderte Blutglukose, erhöhtes Serum-Cholesterin sowie ein erhöhtes Lebergewicht in Osmr-KO- gegenüber WT-Mäusen. Andersherum waren Körpergewicht, Blutglukose, Serum-Cholesterin und Lebergewicht in Ldlr-Osmr-KO- gegenüber Ldlr-KO-Mäusen vermindert. Im Rahmen der vorliegenden Arbeit erfolgte die histologische Untersuchung des Lebergewebes, die Messung von Serum-Triglyzeriden und Fettsäuren sowie die Untersuchung der hepatischen Genexpression. An kultivierten Zellen der humanen Hepatom-Zelllinie HepG2 wurde eine mögliche Regulation der CYP7A1-Genexpression durch OSM untersucht. CYP7A1 ist als Schrittmacherenzym der Gallensäuresynthese an der hepatischen Cholesterin-Clearance beteiligt.
Osmr-KO-Mäuse zeigten gegenüber WT-Mäusen histologisch eine verstärkte hepatische Steatose. Bei der Untersuchung der mRNA-Expression von Genen mit Beteiligung an der hepatischen Lipidhomöostase zeigte sich eine Minderexpression von Ldlr in Osmr-KO-Mäusen. Weiterhin zeigte sich eine etwas geringere Expression von Cyp7a1 in Osmr-KO-Mäusen. Die Expression aller anderen untersuchten Gene, die an Fettsäuresynthese, Cholesterintransport und –metabolismus beteiligt sind, lieferten keine Erklärung für eine erhöhte hepatische Lipidakkumulation in Osmr-KO-Mäusen. Ldlr-Osmr-KO-Mäuse hatten gegenüber Ldlr-KO-Mäusen eine geringer ausgeprägte hepatische Steatose. Die mRNA-Expression von Genen der Fettsäuresynthese, der Cholesterinbiosynthese und des Cholesterintransports waren in Ldlr-Osmr-KO- gegenüber Ldlr-KO-Mäusen nicht wesentlich verändert. Allerdings fiel eine deutliche Hochregulation von Cyp7a1 in Ldlr-Osmr-KO-Mäusen auf. Darüber hinaus war Osm in Ldlr-KO-Mäusen gegenüber WT-Mäusen stärker exprimiert. Um eine Regulation von CYP7A1 durch OSM nachzuweisen, wurde die Genexpression in HepG2-Zellen nach Stimulation mit OSM untersucht. Hierbei zeigte sich, dass OSM die mRNA-Expression von CYP7A1 supprimierte. Dieser Effekt war durch die Zugabe von Inhibitoren der Januskinasen (JAK), Mitogen Activated Protein Kinase/ERK-Kinase (MEK) und Extracellular-signal Regulated Kinase ½ (ERK1/2) reversibel. Die CYP7A1-Suppression durch OSM ging mit einer verminderten Expression des Transkriptionsfaktor-Gens HNF4A einher.
Osmr-KO-Mäuse zeigten gegenüber WT-Mäusen nach 12 Wochen Western Diet verstärkte Adipositas, Dyslipidämie sowie eine hepatische Steatose. Die Analyse der hepatischen mRNA-Expression legt nahe, dass die Minderexpression von Ldlr in Osmr-KO-Mäusen im Vergleich zu WT-Mäusen zur Verstärkung der Dyslipidämie und hepatischen Steatose beigetragen hat. Weiterhin kann die geringere Expression von Cyp7a1 in Osmr-KO-Mäusen durch daraus resultierende Akkumulation von Cholesterin zur erhöhten hepatischen Lipidakkumulation in diesen Mäusen beigetragen haben. Ldlr-KO-Mäuse zeigten nach 12 Wochen Western Diet ebenfalls eine hepatische Steatose. Diese war in Ldlr-Osmr-KO-Mäusen gegenüber Ldlr-KO-Mäusen geringer ausgeprägt. Die erhöhte Expression von Cyp7a1 in Ldlr-Osmr-KO-Mäusen kann die Verbesserung von hepatischer Lipidakkumulation und Dyslipidämie durch erhöhte Cholesterinmetabolisierung zu Gallensäuren erklären. Übereinstimmend mit der Cyp7a1-Regulation in LDLR-defizienten Mäusen zeigte sich in vitro, dass OSM die Expression von CYP7A1 in HepG2-Zellen vermindert und sich so negativ auf die hepatische Lipidhomöostase auswirken kann. Insgesamt implizieren diese Ergebnisse eine divergierende Rolle von OSM bei der Entwicklung einer hepatischen Steatose abhängig vom genetischen Hintergrund. OSM scheint bei WT-Mäusen für die Erhaltung der metabolischen Gesundheit wichtig zu sein. Bei Ldlr-KO-Mäusen hingegen scheint OSM die Entwicklung von Adipositas, Dyslipidämie und hepatischer Steatose zu fördern. Die differenzielle Rolle in WT- und Ldlr-KO-Mäusen könnte durch unterschiedliche Osm-Expressionsspiegel zustande kommen: Während basale OSMRβ-Signaltransduktion durch geringe OSM-Spiegel in WT-Mäusen für die Lipidhomöostase essenziell zu sein scheint, könnte erhöhte oder prolongierte OSMRβ-Signaltransduktion durch höhere OSM-Spiegel in Ldlr-KO-Mäusen das Fortschreiten der hepatischen Steatose fördern. Dies stellt OSM als mögliches NAFLD-Therapeutikum in Frage. Um die Hypothese zu überprüfen, dass OSM abhängig von der Höhe und Kinetik der Spiegel günstige oder ungünstige Effekte auf die NAFLD-Entwicklung hat, sollte in zukünftigen Experimenten der Einfluss kurz- und langfristiger Behandlung von WT-Mäusen mit OSM unterschiedlicher Konzentrationen auf die Entwicklung einer hepatischen Steatose untersucht werden.
Background: Chimeric antigen receptor (CAR) T-cells are changing the therapeutic landscape of hematologic malignancies. Severe side effects include cytokine release syndrome (CRS) and immune effector cell-associated neurotoxicity syndrome (ICANS), but prolonged cytopenia has also been reported. The underlying mechanism for prolonged cytopenia is poorly understood so far. Cases: Severe pancytopenia with grade 2-3 anemia was marked 2–3 months after treatment. Laboratory evaluation revealed undetectable levels of haptoglobin with increased reticulocyte counts. Coomb's tests were negative, no schistocytes were detected on blood smear, and infectious causes were ruled out. Increased erythropoiesis without lymphoma infiltration was noted on bone marrow biopsy. A spontaneous increase in haptoglobin and hemoglobin levels was observed after several weeks. For one patient, peripheral CAR-T levels were monitored over time. We observed a decline at the same time as hemoglobin levels began to rise, implying a potential causality. Conclusion: To our knowledge, we describe the first two cases of Coombs-negative hemolytic anemia after CAR-T treatment for B-cell lymphoma. We encourage routine monitoring for hemolytic anemia after CAR-T treatment and also encourage further investigations on the underlying mechanism.
Limiting bone resorption and regenerating bone tissue are treatment goals in myeloma bone disease (MMBD). Physical stimuli such as mechanical loading prevent bone destruction and enhance bone mass in the MOPC315.BM.Luc model of MMBD. It is unknown whether treatment with the Bruton's tyrosine kinase inhibitor CC-292 (spebrutinib), which regulates osteoclast differentiation and function, augments the anabolic effect of mechanical loading. CC-292 was administered alone and in combination with axial compressive tibial loading in the MOPC315.BM.Luc model for three weeks. However, neither CC-292 alone nor its use in combination with mechanical loading was more effective in reducing osteolytic bone disease or rescuing bone mass than mechanical stimuli alone, as evidenced by microcomputed tomography (microCT) and histomorphometric analysis. Further studies are needed to investigate novel anti-myeloma and anti-resorptive strategies in combination with physical stimuli to improve treatment of MMBD.
Non-alcoholic fatty liver disease (NAFLD) is rising in prevalence, and a better pathophysiologic understanding of the transition to its inflammatory phenotype (NASH) is key to the development of effective therapies. To evaluate the contribution of the NLRP3 inflammasome and its downstream effectors IL-1 and IL-18 in this process, we applied the true-to-life “American lifestyle-induced obesity syndrome” (ALiOS) diet mouse model. Development of obesity, fatty liver and liver damage was investigated in mice fed for 24 weeks according to the ALiOS protocol. Lipidomic changes in mouse livers were compared to human NAFLD samples. Receptor knockout mice for IL-1 and IL-18 were used to dissect the impact of downstream signals of inflammasome activity on the development of NAFLD. The ALiOS diet induced obesity and liver steatosis. The lipidomic changes closely mimicked changes in human NAFLD. A pro-inflammatory gene expression pattern in liver tissue and increased serum liver transaminases indicated early liver damage in the absence of histological evidence of NASH. Mechanistically, Il-18r\(^{−/−}\)- but not Il-1r\(^{−/−}\) mice were protected from early liver damage, possibly due to silencing of the pro-inflammatory gene expression pattern. Our study identified NLRP3 activation and IL-18R-dependent signaling as potential modulators of early liver damage in NAFLD, preceding development of histologic NASH.
Due to the low frequency of abnormalities affecting the spleen, this organ is often overlooked during radiological examinations. Here, we report on the unexpected finding, that the spleen signal on diffusion-weighted MRI (DW-MRI) is associated with clinical parameters in patients with plasma cell dyscrasias. Methods: We investigated the spleen signal on DW-MRI together with clinical and molecular parameters in 295 transplant-eligible newly diagnosed Multiple Myeloma (NDMM) patients and in 72 cases with monoclonal gammopathy of undetermined significance (MGUS). Results: Usually, the spleen is the abdominal organ with the highest intensities on DW-MRI. Yet, significant signal loss on DW-MRI images was seen in 71 of 295 (24%) NDMM patients. This phenomenon was associated with the level of bone marrow plasmacytosis (P=1x10(-10)) and International Staging System 3 (P=0.0001) but not with gain(1q), and del(17p) or plasma cell gene signatures. The signal was preserved in 72 individuals with monoclonal gammopathy of undetermined significance and generally re-appeared in MM patients responding to treatment, suggesting that lack of signal reflects increased tumor burden. While absence of spleen signal in MM patients with high risk disease defined a subgroup with very poor outcome, re-appearance of the spleen signal after autologous stem cell transplantation was seen in patients with improved outcome. Our preliminary observation suggests that extramedullary hematopoiesis in the spleen is a factor that modifies the DW-MRI signal of this organ. Conclusions: The DW-MRI spleen signal is a promising marker for tumor load and provides prognostic information in MM.
Im Rahmen dieser Studie wurde die Lebensqualität (QoL) von Patienten mit Multiplem Myelom zu verschiedenen Therapiezeitpunkten untersucht. Dabei erwies sich die erstmals im Rahmen einer Studie mit Myelompatienten angewandte Kombination aus PHQ-4, EORTC QLQ-C30 und dem spezifischen -MY20 Fragebogen als geeignetes Instrument zur validen Erfassung von Ängstlichkeit/Depressivität und Lebensqualität. Insgesamt schätzten Erstlinienpatienten, Männer und jüngere Patienten vor, während und nach der Therapie ihre Lebensqualität positiver ein, sodass insbesondere Rezidivpatienten, Frauen und ältere Patienten von einer intensivierten therapiebegleitenden supportiven Betreuung profitieren könnten. Es sollte bei der Therapiewahl berücksichtigt werden, dass Erstlinienpatienten zum einen über eine insgesamt bessere allgemeine QoL und geringere Schmerzen als Rezidivpatienten berichteten und zum anderen es durch die systemische Therapie bei diesen zu einer weiteren Verbesserung kommen kann. Unabhängig hiervon korrelierte der ECOG-Status signifikant mit der QoL und sollte daher regelmäßig erhoben werden. Während der Therapie kam es bei Myelompatienten v.a. zu einer negativeren Wahrnehmung des eigenen Körperbilds, einer Abnahme der kognitiven Funktion und einer Zunahme der Therapienebenwirkungen, sodass interdisziplinäre Behandlerteams neben einem optimalen Nebenwirkungsmanagement auch in der klinischen Routine noch nicht so fest etablierte Ressourcen berücksichtigen sollten, wie z.B. psychoedukative Interventionen, Entspannungsverfahren oder auch kognitives Training. Eine der wichtigsten Erkenntnisse der Studie war die signifikant reduzierte Lebensqualität bei Patienten mit vermehrter Ängstlichkeit/Depressivität, die die Notwendigkeit eines regelmäßigen Screenings in der klinischen Routine aufzeigt, um Risikopatienten entsprechend zu identifizieren. Trotz der vermuteten Lebensqualitätsbeeinflussung durch die intensivere, längere Therapie, zeigten sich bei Tandemtransplantierten nicht mehr Lebensqualitätsvariablen signifikant negativ beeinflusst als beim Gesamtkollektiv, sodass diese Beobachtung eine wertvolle Entscheidungshilfe für Patienten sein könnte, die aus Sorge vor einer reduzierten Lebensqualität transplantationsbasierten Konzepten zurückhaltend gegenüberstehen. Unter Berücksichtigung der o.g. Limitationen, konnte zusätzlich eine deutliche positive Beeinflussung der Lebensqualität durch Teilnahme an klinischen Therapiestudien aufgezeigt werden, sodass Patienten evtl. von einer noch intensiveren multiprofessionellen Begleitung wie sie in Studiensettings gegeben ist profitieren könnten.
The immunomodulatory role of human leukocyte antigen (HLA)-E in hematopoietic stem cell transplantation (HSCT) has not been extensively investigated. To this end, we genotyped 509 10/10 HLA unrelated transplant pairs for HLA-E, in order to study the effect of HLA-E as a natural killer (NK)-alloreactivity mediator on HSCT outcome in an acute leukemia (AL) setting. Overall survival (OS), disease free survival (DFS), relapse incidence (RI) and non-relapse mortality (NRM) were set as endpoints. Analysis of our data revealed a significant correlation between HLA-E mismatch and improved HSCT outcome, as shown by both univariate (53% vs. 38%, P=0.002, 5-year OS) and multivariate (hazard ratio (HR)=0.63, confidence interval (CI) 95%=0.48–0.83, P=0.001) analyses. Further subgroup analysis demonstrated that the positive effect of HLA-E mismatch was significant and pronounced in advanced disease patients (n=120) (5-year OS: 50% vs. 18%, P=0.005; HR=0.40, CI 95%=0.22–0.72, P=0.002; results from univariate and multivariate analyses, respectively). The study herein is the first to report an association between HLA-E incompatibility and improved post–transplant prognosis in AL patients who have undergone matched unrelated HSCT. Combined NK and T cell HLA-E-mediated mechanisms may account for the better outcomes observed. Notwithstanding the necessity for in vitro and confirmational studies, our findings highlight the clinical relevance of HLA-E matching and strongly support prospective HLA-E screening upon donor selection for matched AL unrelated HSCTs.
Using data from the German Hepatitis C-Registry (Deutsche Hepatitis C-Register, DHC-R), we report the real-world safety and effectiveness of glecaprevir/pibrentasvir (GLE/PIB) treatment and its impact on patient-reported outcomes (PROs) in underserved populations who are not typically included in clinical trials, yet who will be crucial for achieving hepatitis C virus (HCV) elimination. The DHC-R is an ongoing, non-interventional, multicenter, prospective, observational cohort study on patients treated for chronic HCV infection in Germany. The data cutoff was 17 January 2021. The primary effectiveness endpoint was sustained virologic response at post-treatment Week 12 (SVR12). Safety outcomes were assessed in all patients receiving GLE/PIB. PROs were assessed using the SF-36 survey. Of 2354 patients, 1964 had valid SVR12 data (intention-to-treat analysis). Of these, 1905 (97.0%) achieved SVR12 with rates similar across the comorbidities analyzed, except for people who actively use drugs (PWUD (active)) (86.4%). Excluding those who discontinued treatment and did not achieve SVR12, or were reinfected with HCV, the rate was 99.3%, with similar results regardless of comorbidity. PWUD (active) and those with psychiatric disorders had the most meaningful improvements in PROs. Adverse events (AEs) occurred in 631/2354 patients (26.8%), and serious AEs in 44 patients (1.9%). GLE/PIB was highly effective and well tolerated in this real-world study of patient groups key to HCV elimination.
Bile salts accumulating during cholestatic liver disease are believed to promote liver fibrosis. We have recently shown that chenodeoxycholate (CDC) induces expansion of hepatic stellate cells (HSCs) in vivo, thereby promoting liver fibrosis. Mechanisms underlying bile salt-induced fibrogenesis remain elusive. We aimed to characterize the effects of different bile salts on HSC biology and investigated underlying signaling pathways. Murine HSCs (mHSCs) were stimulated with hydrophilic and hydrophobic bile salts. Proliferation, cell mass, collagen deposition, and activation of signaling pathways were determined. Activation of the human HSC cell line LX 2 was assessed by quantification of α-smooth muscle actin (αSMA) expression. Phosphatidyl-inositol-3-kinase (PI3K)-dependent signaling was inhibited both pharmacologically and by siRNA. CDC, the most abundant bile salt accumulating in human cholestasis, but no other bile salt tested, induced Protein kinase B (PKB) phosphorylation and promoted HSC proliferation and subsequent collagen deposition. Pharmacological inhibition of the upstream target PI3K-inhibited activation of PKB and pro-fibrogenic proliferation of HSCs. The PI3K p110α-specific inhibitor Alpelisib and siRNA-mediated knockdown of p110α ameliorated pro-fibrogenic activation of mHSC and LX 2 cells, respectively. In summary, pro-fibrogenic signaling in mHSCs is selectively induced by CDC. PI3K p110α may be a potential therapeutic target for the inhibition of bile salt-induced fibrogenesis in cholestasis.
The optimal treatment sequence of tyrosine kinase inhibitor (TKI)-based therapy in patients with hepatocellular carcinoma (HCC) remains unclear. Therefore, sequential systemic therapy after first-line therapy with sorafenib or lenvatinib was compared in a retrospective real-world cohort. In total, 164 patients with HCC were included. Child B cirrhosis was present in 26 patients (16.5%), whereas 132 patients (83.5%) had preserved liver function. In total, 72 patients (44%) discontinued systemic therapy after first-line therapy while 51 (31%) and 31 (19%) patients received 2 or more treatment lines. Most notably, median overall survival (mOS) was influenced by liver functional status and patient performance status at the beginning of first-line therapy. Patients receiving a sequential therapy regimen had significantly longer mOS compared to patients that discontinued systemic therapy after omitting first-line treatment. The choice of the initial TKI did not impact mOS. A clear deterioration of liver function could be observed during the course of TKI-based treatment.