[Cancer family syndrome and familial aggregative colorectal cancer].

Six pedigrees of cancer family syndrome, multiple colorectal cancer (89 cases) and colorectal cancer with malignancies in other organs (95 cases), experienced at the National Cancer Center Hospital were reviewed with particular emphasis placed on the familial aggregation and cumulative age incidence. A high association with genetic or familial factors was found in multiple primary colorectal cancer with a family history of colorectal cancer.