Abstract
Alopecia areata (AA) has long been associated with thyroid diseases; however, the temporality of their association remains unclear. This study aimed to investigate the bidirectional association between AA and thyroid diseases. In analysis 1, we included 5929 AA patients and 59,290 matched controls to assess the risk of thyroid diseases. In analysis 2, we included 35,071 patients with thyrotoxicosis, 19,227 patients with Graves’ disease, 5460 patients with thyroiditis, 3352 patients with Hashimoto’s thyroiditis, and their matched controls (1:10) to assess the risk of AA. Incidence of thyroid diseases and AA were the outcomes in analysis 1 and analysis 2, respectively. After adjusting the potential confounders, AA patients had an increased risk of all thyroid diseases, including toxic nodular goiter, (aHR 10.17; 95% confidence interval [CI] 5.32–19.44), nontoxic nodular goiter (aHR 5.23; 95% CI 3.76–7.28), thyrotoxicosis (aHR 7.96; 95% CI 6.01–10.54), Graves’ disease (aHR 8.36; 95% CI 5.66–12.35), thyroiditis (aHR 4.04; 95% CI 2.12–7.73), and Hashimoto thyroiditis (aHR 4.35; 95% CI 1.88–10.04). On the contrary, a significantly increased risk of developing AA was observed among patients with thyrotoxicosis (aHR 9.29; 95% CI, 7.11–12.14), Graves’ disease (aHR 8.66; 95% CI 6.03–12.42), and thyroiditis (aHR 6.42; 95% CI 3.15–13.11) but not in patients with Hashimoto’s thyroiditis. In conclusion, our study found a bidirectional association between AA and thyroid diseases, suggesting shared biological mechanisms underlying these two diseases.
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The data that support the findings of this study are available on request from the corresponding author, but they are not publicly available due to privacy restrictions.
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Acknowledgements
This study was funded by the Ministry of Science and Technology, R.O.C. under Grant (MOST 107-2314-B-075-032-MY3-2).
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This study was funded by the Ministry of Science and Technology, R.O.C. under Grant (MOST 107-2314-B-075-032-MY3-2).
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M-HC had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Concept and design: all authors. Acquisition, analysis, or interpretation of data: all authors. Drafting of the manuscript: Y-XD. critical revision of the manuscript for important intellectual content: all authors. Statistical analysis: Y-HT.
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Dai, YX., Tai, YH., Chang, YT. et al. Bidirectional association between alopecia areata and thyroid diseases: a nationwide population-based cohort study. Arch Dermatol Res 313, 339–346 (2021). https://doi.org/10.1007/s00403-020-02109-7
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DOI: https://doi.org/10.1007/s00403-020-02109-7