JOURNAL ARTICLE

The prognostic value of DNA damage level in peripheral blood lymphocytes of chemotherapy-naïve patients with germ cell cancer

Zuzana Sestakova, Katarina Kalavska, Lenka Hurbanova, Dana Jurkovicova, Jan Gursky, Michal Chovanec, Daniela Svetlovska, Vera Miskovska, Jana Obertova, Patrik Palacka, Katarina Rejlekova, Zuzana Sycova-Mila, Silvia Cingelova, Stanislav Spanik, Jozef Mardiak, Miroslav Chovanec, Michal Mego
Oncotarget 2016 November 15, 7 (46): 75996-76005
27732956
Germ cell tumors (GCTs) are extraordinarily sensitive to cisplatin (CDDP)-based chemotherapy. DNA damage represents one of the most important factors contributing to toxic effects of CDDP-based chemotherapy. This study was aimed to evaluate the prognostic value of DNA damage level in peripheral blood lymphocytes (PBLs) from chemo-naïve GCT patients. PBLs isolated from 59 chemotherapy-naïve GCT patients were included into this prospective study. DNA damage levels in PBLs were evaluated by the Comet assay and scored as percentage tail DNA by the Metafer-MetaCyte analyzing software. The mean ± SEM (standard error of the mean) of endogenous DNA damage level was 5.25 ± 0.64. Patients with DNA damage levels lower than mean had significantly better progression free survival (hazard ratio [HR] = 0.19, 95% CI (0.04 - 0.96), P = 0.01) and overall survival (HR = 0.00, 95% CI (0.00 - 0.0), P < 0.001) compared to patients with DNA damage levels higher than mean. Moreover, there was significant correlation between the DNA damage level and presence of mediastinal lymph nodes metastases, IGCCCG (International Germ Cell Cancer Collaborative Group) risk group, and serum tumor markers level. These data suggest that DNA damage levels in PBLs of GCT patients may serve as an important prognostic marker early identifying patients with poor outcome.

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