Harvard Men's Health Watch

Prostate-specific antigen: A new(ish) study

Prostate-specific antigen (PSA) is a protein produced by every prostate, benign or malignant. The prostate pumps the protein into the ejaculate, where it works to liquefy semen so sperm can swim to their intended target. The majority of American men above age 50 have been tested at least once. Widespread acceptance notwithstanding, PSA screening for prostate cancer remains hugely controversial in scientific circles. A study from Sweden, presents a favorable view of screening but is unlikely to end the debate.
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