The following data were collected: first author, publication year, cancer type, treatment, side effects, acute/late degree, evaluation criteria, cutoff value, follow-up period, survival outcome, HR (95% CI), number of patients in the high/positive XRCC1 expression group and low/negative XRCC1 expression group associated with treatment response, and number of patients in the case-control group and the association between XRCC1 rs25487 and treatment response/side effects. The gene discussed is XRCC1; the disease is cancer.