Cysteine-rich secretory protein 3 (CRISP3) belongs to the cysteine-rich secretory protein family. CRISPs are characterized by a cysteine-rich domain at the COOH terminal that form 8 intramolecular disulfide bonds. Mammalian members of the CRISP family are expressed predominantly in the male reproductive tract and are implicated in the process of reproduction from spermiogenesis, posttesticular sperm maturation and capacitation to oocyte-sperm fusion. CRISP3 is epithelium-specific and found predominantly in salivary gland, pancreas and prostate, and in less abundance in the epididymis, ovary, thymus and colon. CRISP3 is up-regulated in malignant prostatic epithelium, therefore, it can be used as a potential prostate cancer biomarker.