Pearson Correlation analysis revealed an association of high KLK4 levels with late stage (P = 0.017), large residual tumor volume (P = 0.034) and no-response to chemotherapy (P = 0.03) but not the tumor grade (P = 0.95), tumor origin (primary or metastatic sites, P = 0.59) or ascites volume (P = 0.38, Supplementary Table S2). This evidence concerns the gene KLK4 and neoplasm.