In in silico analysis using an Affymetrix-based ovarian cancer data set from The Cancer Genome Atlas (TCGA) selected for parameters with the same characteristics as in the analyzed cohort, elevated KLK4 mRNA expression was shown to be significantly associated with both shorter OS (p = 0.047) as well as PFS (p = 0.032). This evidence concerns the gene KLK4 and ovarian cancer.