RecruitingClinical trialActive Surveillance for Cancer of the Prostate (ASCaP)Active Surveillance (A.S.) of prostate cancer (CaP) is the systematic monitoring of men with low-risk, localized lesions, with curative treatment of those whose tumors show substantial progression. A.S. is different from Watchful Waiting (W.W.), which is the palliative treatment of men with progressive prostate cancer.