Abstract
According to a “two-hit” model, dominantly inherited predisposition to cancer entails a germline mutation, while tumorigenesis requires a second, somatic, mutation. Non-hereditary cancer of the same type requires the same two hits, but both are somatic. The original tumor used in this model, retinoblastoma, involves mutation or loss of both copies of theRB1 tumor-suppressor gene in both hereditary and non-hereditary forms. In fact, most dominantly inherited cancers show this relationship. New questions have arisen, however. When a tumor-suppressor gene is ubiquitously expressed, why is there any specificity of tumor predilection? In some instances, it is clear that two hits produce only a benign precursor lesion and that other genetic events are necessary. As the number of necessary events increases, the impact of the germline mutation diminishes. The number of events is least for embryonal tumors, and relatively small for certain sarcomas. Stem-cell proliferation evidently plays a key role early in carcinogenesis. In some tissues it is physiological, as in embryonic development and in certain tissues in adolescence. In adult renewal tissues, the sites of the common carcinomas, mutation may be necessary to impair the control of switching between renewal and replicative cell divisions; theAPC gene may be the target of such a mutation.
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Work dedicated to Dr. Haruo Sugano on the occasion of his 70th birthday. The material of this paper was essentially presented at the 60th Anniversary Symposium of the Cancer Institute and the Cancer Institute Hospital, Tokyo, held in September 1994
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Knudson, A.G. Hereditary cancer: Two hits revisited. J Cancer Res Clin Oncol 122, 135–140 (1996). https://doi.org/10.1007/BF01366952
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DOI: https://doi.org/10.1007/BF01366952