CNTN6 and cancer: While the polymorphisms CNTN6 rs6764623 (CC/CA vs. AA; adjusted hazard ratio (aHR) = 0.44; 95% confidence interval (CI), 0.20–0.96; P = 0.040), PTGS2 rs20417 (GG vs. CC/CG; aHR = 2.88; 95%CI, 1.10–7.51; P = 0.031) and RGS7 rs2502448 (TT vs. CT/CC; aHR = 2.35; 95%CI, 1.20–4.61; P = 0.013) were associated with the five-year risk of cancer recurrence, ITGB3 rs5918 was a predictor of the risk of death due to all causes, particularly among male patients (TT vs. CT/CC; aHR = 2.05; 95% confidence interval (CI), 1.13–3.72; P = 0.019).