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Sibling recurrence risk in autoimmune thyroid disease.

R Villanueva1, D A Greenberg, T F Davies

  • 1Division of Endocrinology, Diabetes and Bone Diseases, Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029, USA.

Thyroid : Official Journal of the American Thyroid Association
|October 16, 2003
PubMed
Summary

Genetic factors significantly influence autoimmune thyroid diseases (AITD). This study calculated a high sibling risk ratio (lambda(s)) for AITD, Graves

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Area of Science:

  • Endocrinology
  • Genetics
  • Epidemiology

Background:

  • Autoimmune thyroid diseases (AITD) have a known genetic component.
  • Quantifying this genetic influence requires accurate prevalence data and sibling risk ratio (lambda(s)) calculations.

Purpose of the Study:

  • To compute the sibling recurrence risk for AITD using recent US prevalence data.
  • To confirm the significant contribution of genetic factors in the development of AITD.

Main Methods:

  • Utilized National Health and Nutrition Examination Survey III (NHANES III) prevalence data for hypothyroidism and hyperthyroidism.
  • Recruited 155 AITD patients (131 Graves' disease [GD], 24 Hashimoto's thyroiditis [HT]) with information on affected siblings.
  • Calculated lambda(s) based on single ascertainment and NHANES III prevalence rates.

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Main Results:

  • The sibling risk ratio (lambda(s)) for AITD was calculated as 16.9.
  • Specific lambda(s) values were 11.6 for Graves' disease and 28.0 for Hashimoto's thyroiditis.
  • These findings indicate a substantial genetic contribution to AITD development.

Conclusions:

  • Genetic factors play a significant role in the etiology of autoimmune thyroid diseases.
  • The calculated high sibling risk ratios strongly support a genetic predisposition to AITD, GD, and HT.
  • This study provides quantitative evidence for the genetic heritability of AITD.