Prostate-specific acid phosphatase (PSAP) is an enzyme produced in prostate epithelial cells. PSAP expression levels proportionally increase with prostate cancer progression.15 PSAP IHC staining is often used in conjunction with prostate specific antigen (PSA) staining to help distinguish poorly differentiated carcinomas. For instance, PSAP is commonly used to help differentiate prostate adenocarcinoma and urothelial carcinoma […]