The more common polyposis syndromes that have a known genetic basis are familial adenomatous polyposis (FAP), which corresponds to 0.5-1% of CRCs, and polyposis associated with MUTYH (PAM), in 0.7%. FAP is caused by mutations in the APC gene, which has a dominant autosomal inheritance pattern and is associated with a very high risk of suffering CRC throughout life, while PAM is transmitted with a recessive autosomal inheritance pattern and has been associated with an accumulated risk of suffering CRC of 43% at 60 years of age.
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