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Dictionary > Protein expression > KLK3

Detail 1
Normal prostate showing PSA (KLK3) expression in prostatic glands. (slight unspecific staining in the stromal component)

PSA (KLK3) - Marker for normal prostate and prostate cancer

The prostate-specific antigen (PSA) is encoded by the KLK3 gene and is a member of the kallikrein-related peptidase family. PSA is specifically expressed in glandular cells of the prostate and is secreted into the semen, where it is important for maintaining sperm motility. Traditionally, elevated serum levels of PSA has been used to indicate prostate cancer, and due to the high specificity of PSA for prostate, antibodies against PSA are commonly used to diagnose metastases from prostate cancer.

Show KLK3 in the protein atlas.

Normal tissue - Protein expression


Cancer tissue - Protein expression

Prostate cancer