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- W1967060470 abstract "Radiotherapy and chemotherapy cause genotoxic side effects that are highly variable among patients. In this study, we evaluated DNA integrity using the comet assay in peripheral blood lymphocytes from breast cancer patients before (pre-treatment patients; n = 47) and after (post-treatment patients; n = 24) radiotherapy and/or chemotherapy treatment and from healthy donors (n = 15). Comet evaluation was made by visual (types 0−4) and digital (percentage of DNA remaining in the comet head = % head DNA) analysis. The association between the level of DNA damage and cancer prognostic factors was assessed. The treatments caused a significant increase in DNA damage registered by both visual (p < 0.001) and digital (p < 0.001) analyses. No significant associations between the level of DNA damage in pre-treatment patients and cancer prognostic factors were found. A significant correlation between the comet results from each patient before and after treatment (r = 0.64, p = 0.001) was observed. The % head DNA in post-treatment samples from patients with a high level of DNA damage before treatment (30.3 ± 3.1%, p < 0.01) was lower than in post-treatment samples from patients with a low-to-medium level of DNA damage before therapy (49.2 ± 4.4%). These results support the usefulness of the comet assay as a sensitive technique to evaluate basal DNA status and DNA damage caused by cancer treatments. The comet assay could contribute to treatment decisions, especially by taking into account the patient's basal DNA damage before therapy." @default.
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- W1967060470 date "2014-01-01" @default.
- W1967060470 modified "2023-10-06" @default.
- W1967060470 title "Relationship between Genotoxic Effects of Breast Cancer Treatments and Patient Basal DNA Integrity" @default.
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- W1967060470 doi "https://doi.org/10.1615/jenvironpatholtoxicoloncol.2014010592" @default.
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