[Genetic epidemiological approach to large bowel cancer].

Incidence of large bowel cancer under predominant genetic influence is estimated to occupy about one tenth of general large bowel cancer population. They are defined to include hereditary gastrointestinal polyposes (adenomatosis coli, Peutz-Jeghers syndrome and juvenile polyposis) and the non-polypotic familial (hereditary) large bowel cancer (Cancer Family Syndrome and allied conditions). The strategy for the genetic cancer high-risk group under these conditions based on the central registration system was described. Our experiences indicated the approach was actually effective for the polyposes a and was also promising for the non-polyposis familial of large bowel cancer.