Poorer CSS and OS rates at the time of diagnosis were observed for subgroups based on low Hb, high LDH level, BMI ≤18.5kg/m2, ECOG‐PS ≥1, and the presence of lymph node metastasis; however, these differences diminished in the following years, suggesting that the prognostic significance of these factors decreases as time elapses after diagnosis. This evidence concerns the gene GSTM1 and metastatic malignant neoplasm in the lymph nodes.