Expression of Ku80 in Cervical Cancer Correlates With Response to Radiotherapy and Survival
| Autor: | Takeo Ohnishi, Kiyonori Kin, Nobuaki Shikata, Yoshitaka Miyazaki, Yoko Harima, Hiroyasu Ishihara, Mitsuharu Sougawa, Satoshi Sawada, Masahiro Imamura |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Oncology
Cancer Research medicine.medical_specialty Microarray medicine.medical_treatment Brachytherapy Uterine Cervical Neoplasms Polymerase Chain Reaction Radiation Tolerance Gene product Radioresistance Internal medicine Humans Medicine RNA Messenger Radiosensitivity Ku Autoantigen Gene Aged Cervical cancer Messenger RNA business.industry DNA Helicases Antigens Nuclear Radiotherapy Dosage Middle Aged medicine.disease Immunohistochemistry Survival Analysis DNA-Binding Proteins Radiation therapy Female business |
| Zdroj: | American Journal of Clinical Oncology. 26:e80-e85 |
| ISSN: | 0277-3732 |
| DOI: | 10.1097/01.coc.0000077938.48974.59 |
| Popis: | To reveal the genes relevant for prediction of cervical cancer after radiotherapy, we previously carried out cDNA microarray experiments on primary cervical cancer comparing patients with a complete response (CR) and those with no change (NC). Some of these genes had already been associated with the radiation response, such as x-ray repair cross-complementing 5 (XRCC5), which was found more in radioresistant tumors than in radiosensitive ones. The aim of this study was to confirm the possible roles of XRCC5 mRNA levels by a real-time polymerase chain reaction method in 20 cervical cancers, and Ku80 protein, which is the gene product of XRCC5, using a histopathologic method of formalin-fixed sections of tumor biopsies in determining tumor response to radiotherapy and survival in 89 patients with cervical cancer. The levels of XRCC5 mRNA were 10(4.82) +/- 10(0.2) copies/microg total RNA in tumor tissues in the CR group (mean +/- standard deviation) and 10(4.95) +/- 10(0.32) copies/microg total RNA in those in the NC group. The levels of XRCC5 mRNA were not significantly different between the CR and NC groups. Histopathologic methods revealed 29.2% (26 of 89) of the patients to be Ku80-negative, with Ku80-positive findings in 70.8% (63 of 89). Of the Ku80-negative patients, 19 had CR, 3 had a partial response (PR), and 4 had NC. Of the Ku80-positive patients, 25 had CR, 22 had PR, and 16 had NC. Ku80-negative tumors showed significantly better responses than Ku80-positive ones, comparing CR and PR/NC responses (p = 0.01). In addition, overall survival was significantly better in the Ku80-negative patients as compared with those who were Ku80-positive (p = 0.04). The results of this study suggest that a low expression of Ku80 protein leads to radiosensitivity in cervical cancer and that Ku80 might play a role in treatment outcome. |
| Databáze: | OpenAIRE |
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