GSTM1 and metastatic malignant neoplasm in the lymph nodes: The patients’ characteristics, including the age, Gleason score, presence of visceral metastasis, presence of lymph node metastasis, presence of symptoms, performance status, albumin (Alb), alkaline phosphatase (ALP), hemoglobin (Hb), creatinine (Cre), prostate‐specific antigen (PSA), LDH, and PMID, are summarized in Table 1.