KLK3 and colonic neoplasm: During the study period, patients with prostate cancer only required prostate-specific antigen (PSA) monitoring,24 whereas patients with colon cancer typically required multiple blood tests (carcinoembryonic antigen [CEA] monitoring), combined with repeated abdominal ultrasounds and colonoscopies.25 It is therefore not surprising that implementing prostate cancer survivorship care could be considered easier.