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Hippostasin, also known as KLK11, is a kallikrein-like serine protease, which has two alternatively spliced isoforms, brain-type and prostate-type. Hippostasin plays a role in the prostate, including reproductive and/or tumorigenic functions. Elevated serum levels of hK11 were found in 70% of women with ovarian cancer and in 60% of men with prostate cancer. Analysis of the KLK11 biomarker in serum may aid in the diagnosis and monitoring of ovarian and prostatic carcinoma.