The following rare syndromes also increase the risk for colorectal cancer:
The number of polyps in individuals with MAP can range from a few to hundreds. The symptoms of MAP overlap with both FAP and attenuated FAP. Genetic testing for mutations in the MYH gene is available and should be considered in individuals suspected of having FAP or attenuated FAP who do not have a mutation in the APC gene. It is not currently known if individuals with only one MYH mutation have a higher than average risk for colorectal polyps and cancer.
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