Environmental and heritable factors in the causation of cancer--analyses of cohorts of twins from Sweden, Denmark, and Finland
- PMID: 10891514
- DOI: 10.1056/NEJM200007133430201
Environmental and heritable factors in the causation of cancer--analyses of cohorts of twins from Sweden, Denmark, and Finland
Abstract
Background: The contribution of hereditary factors to the causation of sporadic cancer is unclear. Studies of twins make it possible to estimate the overall contribution of inherited genes to the development of malignant diseases.
Methods: We combined data on 44,788 pairs of twins listed in the Swedish, Danish, and Finnish twin registries in order to assess the risks of cancer at 28 anatomical sites for the twins of persons with cancer. Statistical modeling was used to estimate the relative importance of heritable and environmental factors in causing cancer at 11 of those sites.
Results: At least one cancer occurred in 10,803 persons among 9512 pairs of twins. An increased risk was found among the twins of affected persons for stomach, colorectal, lung, breast, and prostate cancer. Statistically significant effects of heritable factors were observed for prostate cancer (42 percent; 95 percent confidence interval, 29 to 50 percent), colorectal cancer (35 percent; 95 percent confidence interval, 10 to 48 percent), and breast cancer (27 percent; 95 percent confidence interval, 4 to 41 percent).
Conclusions: Inherited genetic factors make a minor contribution to susceptibility to most types of neoplasms. This finding indicates that the environment has the principal role in causing sporadic cancer. The relatively large effect of heritability in cancer at a few sites suggests major gaps in our knowledge of the genetics of cancer.
Comment in
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Cancer--nature, nurture, or both.N Engl J Med. 2000 Jul 13;343(2):135-6. doi: 10.1056/NEJM200007133430210. N Engl J Med. 2000. PMID: 10891523 No abstract available.
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Cancer, genes, and the environment.N Engl J Med. 2000 Nov 16;343(20):1494-5; discussion 1495-6. doi: 10.1056/NEJM200011163432013. N Engl J Med. 2000. PMID: 11184463 No abstract available.
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Cancer, genes, and the environment.N Engl J Med. 2000 Nov 16;343(20):1494; discussion 1495-6. N Engl J Med. 2000. PMID: 11184464 No abstract available.
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Cancer, genes, and the environment.N Engl J Med. 2000 Nov 16;343(20):1495; discussion 1495-6. N Engl J Med. 2000. PMID: 11184465 No abstract available.
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Cancer, genes, and the environment.N Engl J Med. 2000 Nov 16;343(20):1495; discussion 1495-6. N Engl J Med. 2000. PMID: 11184466 No abstract available.
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