Results indicate that \documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$PSA$$\end{document}PSA is a good biomarker in the diagnosis of prostate cancer, but after treatment, it shows different trends for different treatments. This evidence concerns the gene KLK3 and prostate cancer.