GSTM1 and metastatic malignant neoplasm in the lymph nodes: In the final model for CSS, in addition to PSA, Hb, and ALP, the presence of lymph node metastasis (HR: 1.61; 95% CI: 1.01–2.58) and the EOD score with ≥2 (HR: 2.02; 95% CI: 1.20–3.39) were also significantly associated with poor survival.