TY  - JOUR
A1  - Kroeber, Jana
A1  - Wenger, Barbara
A1  - Schwegler, Manuela
A1  - Daniel, Christoph
A1  - Schmidt, Manfred
A1  - Djuzenova, Cholpon S
A1  - Polat, Bülent
A1  - Flentje, Michael
A1  - Fietkau, Rainer
A1  - Distel, Luitpold V.
T1  - Distinct increased outliers among 136 rectal cancer patients assessed by \(\gamma\)H2AX
JF  - Radiation Oncology
N2  - Background: 
In recent years attention has focused on \(\gamma\)H2AX as a very sensitive double strand break indicator. It has been suggested that \(\gamma\)H2AX might be able to predict individual radiosensitivity. Our aim was to study the induction and repair of DNA double strand breaks labelled by \(\gamma\)H2AX in a large cohort. 

Methods: 
In a prospective study lymphocytes of 136 rectal cancer (RC) patients and 59 healthy individuals were ex vivo irradiated (IR) and initial DNA damage was compared to remaining DNA damage after 2 Gy and 24 hours repair time and preexisting DNA damage in unirradiated lymphocytes. Lymphocytes were immunostained with anti-\(\gamma\)H2AX antibodies and microscopic images with an extended depth of field were acquired. \(\gamma\)H2AX foci counting was performed using a semi-automatic image analysis software. 

Results: 
Distinct increased values of preexisting and remaining \(\gamma\)H2AX foci in the group of RC patients were found compared to the healthy individuals. Additionally there are clear differences within the groups and there are outliers in about 12% of the RC patients after ex vivo IR. 

Conclusions: 
The \(\gamma\)H2AX assay has the capability to identify a group of outliers which are most probably patients with increased radiosensitivity having the highest risk of suffering radiotherapy-related late sequelae.
KW  - histone H2AX
KW  - blood lymphocytes
KW  - in vivo
KW  - foci
KW  - individual radiosensitivity
KW  - rectal cancer
KW  - radiotherapy
KW  - DNA double strand breaks
KW  - phosphorylation
KW  - neck cancer
KW  - oral mucositis
KW  - DNA damage
KW  - radiosensitivity
KW  - repair
KW  - \(\gamma\)h2ax
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-144085
VL  - 10
IS  - 36
ER  -