GSTM1 and metastatic malignant neoplasm in the lymph nodes: When the measurement time for time-varying covariates was limited to between 70 and 110 days, the final Cox models with the highest C-index, which satisfied the proportional hazard assumption, suggested an influence of lymph node metastasis, PSA, Hb, and ALP for CSS (C-index: 0.774) and that of PSA, Hb, ALP, and albumin for OS (C-index: 0.753).