ASS1 and metastatic malignant neoplasm in the lymph nodes: By multivariate analysis, both ASS1 expression (HR: 0.56, 95% CI: 0.32–0.97, p = 0.04) and lymph node metastasis (HR: 1.57, 95% CI: 1.004–2.47, p = 0.048) were independent prognostic factors for OS (Table 5)