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. This evidence concerns the gene CEACAM5 and prostate cancer.