Familial polyposis or familial adenomatous polyposis (FAP) is a premalignant disease. This means that a person with FAP, if left untreated, will invariably develop cancer. Individuals with this disorder grow hundreds of polyps.

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I see you are asking "Is Familial polyposis cancerous"

Familial adenomatous polyposis (FAP) is an inherited disorder characterized by cancer of the large intestine (colon ) and rectum. People with the classic type of familial adenomatous polyposis may begin to develop multiple noncancerous (benign) growths (polyps ) in the colon as early as their teenage years.

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FAP cannot be prevented. Aggressive diagnosis, treatment, and follow-up monitoring are keys to successful management of the disease.

Most patients--more than 85%--who undergo an ileoanal anastomosis are being treated for ulcerative colitis; familial adenomatous polyposis is the next most common condition requiring the surgery.

The only definitive treatment for FAP is surgical removal of the lower intestine. Since the goal is to prevent cancer, the operation is done as soon as adenomatous polyps are found on sigmoidoscopy.