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The effect of gender on response to antithyroid drugs and risk of relapse after discontinuation of the antithyroid drugs in patients with Graves' hyperthyroidism: A multicenter study.

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PURPOSE The outcome of medical treatment in patients with Graves' disease (GD) is generally difficult to predict. In this study, we examined the hypothesis that gender may affect the outcome… Click to show full abstract

PURPOSE The outcome of medical treatment in patients with Graves' disease (GD) is generally difficult to predict. In this study, we examined the hypothesis that gender may affect the outcome of treatment with antithyroid drugs (ATDs). METHODS This is a retrospective multicenter study including 717 (514 female and 203 male) patients with the first episode of GD treated for at least 12 months. Patients were classified as relapse, poorly controlled (several episodes of hyperthyroidism followed by euthyroidism and rarely hypothyroidism, occurring after titration of ATDs), and remission. RESULTS During the mean follow-up time of 26.75±21.25 months (between 1-120 months), 269 (37.5%), 176 (24.5%), and 272 (37.9%) patients experienced a relapse, a poorly controlled disease, and remained in remission, respectively. During the follow-up time, 223 (43.4%) of the female and only 49 (24%) of the male patients remained in remission. Relapse and poorly controlled disease (non-remitting GD) ensued more common in male compared to female patients with GD (hazard ratio 1.26, 95% CI 1.03 - 1.53, P = 0.025). GD in male patients tended to relapse earlier and male patients tended to have larger goiter sizes at diagnosis as well. The smoking habit was also significantly more frequent in males compared to female patients with GD. CONCLUSION Male patients with GD have a markedly higher frequency of relapse and poorly controlled disease, as compared to female patients. Larger goiter size and higher frequency of smoking may contribute to the higher frequency of relapse and poorly controlled disease in male patients.

Keywords: poorly controlled; study; antithyroid drugs; relapse poorly; male patients

Journal Title: Endokrynologia Polska
Year Published: 2020

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