Prostate cancer is not normal.

Prostate specific antigen (PSA)

is a special protein produced by prostate epithelial cells, which is considered to be a marker of prostate cancer. Under normal circumstances, the normal range of this value is between 0-4ng/mL. After prostate cancer surgery, prostate epithelial cells no longer secrete prostate specific antigen, so prostate specific antigen after prostate cancer surgery does not exceed 0.1 ng/mL. Prostate-specific antigen levels after surgery can also help diagnose prostate cancer recurrence, and if the values are abnormally high, it may indicate recurrence.