title: Comparative study of DNA damage and repair in head and neck cancer after radiation treatment.
abstract: We compared DNA damage and the efficacy of its repair after genotoxic treatment with gamma-radiation of lymphocytes and tissue cells isolated from patients with squamous cell carcinoma of head and neck (HNSCC) and healthy donors. Thirty-seven subjects with HNSCC and 35 healthy donors were enrolled in the study. The extent of DNA damage including oxidative lesions and efficiency of the repair were examined by alkaline comet assay. HNSCC cancer cells were more sensitive to genotoxic treatment and displayed impaired DNA repair. In particular, lesions caused by gamma-radiation were repaired less effectively in metastasis of HNSCC than in healthy controls. The differences in radiation sensitivity of cancer and control cells suggested that DNA repair might be critical for HNSCC treatment. We conclude that gamma-radiation might be considered as an effective therapeutic strategy for head and neck cancers, including patients in advanced stage of the disease with clear evidence of metastasis.
authors.affiliation: Department of Molecular Genetics, University of Lodz, Poland.
authors.forename: Pawel
authors.initials: P
authors.lastname: Rusin
authors.forename: Jurek
authors.initials: J
authors.lastname: Olszewski
authors.forename: Alina
authors.initials: A
authors.lastname: Morawiec-Bajda
authors.forename: Karolina
authors.initials: K
authors.lastname: Przybylowska
authors.forename: Dariusz
authors.initials: D
authors.lastname: Kaczmarczyk
authors.forename: Aleksandra
authors.initials: A
authors.lastname: Golinska
authors.forename: Ireneusz
authors.initials: I
authors.lastname: Majsterek
mesh_terms: D000328:Adult; D002294:Carcinoma, Squamous Cell / Q000532:radiotherapy*; D002470:Cell Survival; D002478:Cells, Cultured; D020552:Comet Assay; D004249:DNA Damage; D004260:DNA Repair; D005260:Female; D005720:Gamma Rays; D006258:Head and Neck Neoplasms / Q000532:radiotherapy*; D006801:Humans; D008214:Lymphocytes / Q000528:radiation effects; D008297:Male; D008875:Middle Aged; D013997:Time Factors