Home CONTACT Neoplasma 2008 Neoplasma Vol.55, No.3, p.182-191, 2008

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Founded: 1954
ISSN 0028-2685
ISSN 1338-4317 (online)

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Neoplasma Vol.55, No.3, p.182-191, 2008

Title: Radiosensitivity of peripheral blood lymphocytes from healthy donors and cervical cancer patients; the correspondence of in vitro data with the clinical outcome

Abstract: The reliability of a particular in vitro parameter as potential prognostic biomarker of individual radiosensitivity is still discussed. Therefore, several in vitro radiation-induced cellular endpoints including initial, oxidative and residual DNA damage and the rate of DNA repair were assessed in peripheral blood lymphocytes (PBL) from healthy donors and patients with carcinoma of the cervix using the alkaline single cell gel electrophoresis (the comet assay). PBL from cancer patients were analyzed three times during the course of therapy, prior, in the middle (25-27 Gy) and after the radiotherapy. Interindividual differences in radiation-induced DNA damage and in the kinetics of strand break rejoining were determined within both groups. Significantly higher level of mean background and oxidative DNA damage was estimated in the cancer patient cohort than in the healthy subject group; however similar mean values of the initial DNA damage and the rate of DNA repair kinetics were found in both groups. No adaptive response was determined in PBL from cancer patients due to radiotherapy. The acute radiation toxicity and the clinical outcome were scored according to the criteria as proposed by the National Cancer Institute. A substantial delay in DNA strand break rejoining was determined in cancer patients suffering from adverse side effects (G2+) in comparison to persons with no or very mild radiation toxicity (G0-G1) (p

Keywords: Cervical cancer, Comet assay, Normal tissue damage, Tumor radioresponse, Clinical radiosensitivity
Year: 2008, Volume: 55, Issue: 3 Page From: 182, Page To: 191

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