Over-lapping expression of hepsin, TMPRSS2, KLK4, KLK14, MMP-3 and MMP-9 in benign and malignant prostate. Consecutive sections of a prostate tumor were stained with antibodies against hepsin, TMPRSS2, KLK4, KLK14, MMP-3 and MMP-9. Representative regions showing staining in prostatic ductal adenocarcinoma, prostatic acinar adenocarcinoma with adjacent benign prostate, and PIN were photographed. BGN, benign. All images were acquired using a 40× objective unless otherwise indicated.