Hereditary colorectal cancer characterized by polyposis includes familial adenomatous polyposis (FAP), Peutz–Jeghers syndrome (PJS), juvenile polyposis syndrome (JPS), and serrated polyposis syndrome (SPS); it can be further divided into classical FAP (CFAP), attenuated FAP (AFAP), MUTYH-associated polyposis (MAP), Gardner syndrome, and Turcot syndrome subtypes. This evidence concerns the gene FAP and juvenile polyposis syndrome.