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21 November 2000 | Volume 133 Issue 10 | Pages 770-778
Background: Mutations at the ataxia-telangiectasia locus cause a distinctive autosomal recessive syndrome in homozygotes and predispose heterozygotes to cancer and ischemic heart disease.
Objective: To examine mortality rates among persons carrying a mutated ataxia-telangiectasia gene.
Design: Retrospective cohort study.
Setting: The United States and Canada.
Participants: 405 grandparents of patients with ataxia-telangiectasia.
Measurements: Ages at death and risk for death (from all causes, cancer, ischemic heart disease, and other causes) among carriers and noncarriers of ataxia-telangiectasia mutations.
Results: Compared with noncarriers, carriers of a mutated ataxia-telangiectasia allele had a significantly increased risk for death at 20 through 79 years of age (relative risk, 1.9 [95% CI, 1.3 to 2.8]) (P < 0.001). On average, carriers died 7 to 8 years earlier than noncarriers. Cancer caused most of the excess deaths, and ischemic heart disease caused the remainder. Among carriers, relative risk for death from cancer and ischemic heart disease before 80 years of age was 2.6 (CI, 1.4 to 4.7; P = 0.002) and 2.0 (CI, 1.0 to 4.0; P = 0.062), respectively. Compared with noncarriers, carriers who died of cancer were a mean of 4 years younger (P > 0.2) and carriers who died of ischemic heart disease were a mean of 11 years younger (P = 0.006).
Conclusion: Carriers of mutations at the ataxia-telangiectasia locus, who make up 1.4% to 2% of the general population, have a higher mortality rate and an earlier age at death from cancer and ischemic heart disease than noncarriers.
Author and Article Information
From New York Medical College, Hawthorne, New York.
Acknowledgments: The authors thank Ruby Massey and Patricia Rentas for sample and data collection; Airong Li, MD, DPhil, and Prasanna Athma, PhD, for genotyping; Ronnie Gorman Swift, MD, for reviewing earlier versions of the manuscript; and the participating families, who have made the study possible.
Grant Support: By the National Institutes of Health (CA 14235).
Current Author Addresses: Drs. Su and Swift: The Institute for the Genetic Analysis of Common Diseases, New York Medical College, 4 Skyline Drive, Hawthorne, NY 10532.
Author Contributions: Conception and design: Y. Su, M. Swift.
Analysis and interpretation of the data: Y. Su, M. Swift.
Drafting of the article: Y. Su, M. Swift.
Critical revision of the article for important intellectual content: Y. Su, M. Swift.
Final approval of the article: Y. Su, M. Swift.
Provision of study materials or patients: M. Swift.
Statistical expertise: Y. Su.
Obtaining of funding: M. Swift.
Administrative, technical, or logistic support: M. Swift. ARTICLE
Mortality Rates among Carriers of Ataxia-Telangiectasia Mutant Alleles
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