KLK3 and metastatic malignant neoplasm in the lymph nodes: The serum PSA (p = 0.001), GS (p = 0.007), extra prostatic extension (p < 0.0001), lymphovascular invasion (p = 0.009), perineural invasion (p < 0.0001), resection margin (p < 0.0001), lymph node metastasis (p = 0.004), and RARP (p = 0.04) were all significant prognostic predictors in the univariate analysis.