Association Between Thyroid Diseases and Parkinson’s Disease: A Nested Case-Control Study Using a National Health Screening Cohort

Article type: Research Article

Authors: Kim, Ji Hee^a | Lee, Heui Seung^a | Ahn, Jun Hyong^a | Oh, Jae Keun^a | Chang, In Bok^a | Song, Joon Ho^a | Wee, Jee Hye^b | Min, Chan Yang^c | Yoo, Dae Myoung^c | Choi, Hyo Geun^{c; d; *}

Affiliations: [a] Department of Neurosurgery, Hallym University College of Medicine, Anyang, Korea | [b] Department of Otorhinolaryngology, Hallym University College of Medicine, Anyang, Korea | [c] Hallym Data Science Laboratory, Hallym University College of Medicine, Anyang, Korea | [d] Department of Otorhinolaryngology-Head & Neck Surgery, Hallym University College of Medicine, Anyang, Korea

Correspondence: [*] Correspondence to: Hyo Geun Choi, MD, PhD, Department of Otorhinolaryngology-Head & Neck Surgery, Hallym University Sacred Heart Hospital, 22, Gwanpyeong-ro 170beon-gil, Dongan-gu, Anyang-si, Gyeonggi-do, 14068, Republic of Korea. Tel.: +82 31 380 3849; Fax: +82 31 386 3860; E-mail: pupen@naver.com.

Abstract: Background:Although the dopaminergic system is interconnected with the hypothalamic-pituitary-thyroid axis, few studies have explained the causal relationship between thyroid disease and Parkinson’s disease (PD). Objective:The goal of this study was to investigate the association between thyroid diseases and PD in Korean residents. Methods:The Korean National Health Insurance Service-National Sample Cohort, which includes individuals aged ≥40 years, was assessed from 2002 to 2015. A total of 5,586 PD patients were matched by age, sex, income, and the region of residence with 22,344 control participants at a ratio of 1:4. In the PD and control groups, previous histories of levothyroxine treatment, goiter, hypothyroidism, thyroiditis, and hyperthyroidism were investigated. Results:The rates of levothyroxine treatment for more than 3 months, hypothyroidism, and hyperthyroidism were higher in the PD group than the control group (3.2%, 3.8%, and 2.8% vs. 2.5%, 2.9%, and 1.9%, respectively, p < 0.05). The adjusted odds ratios (ORs) in model 2, which was adjusted for all potential confounders, for hypothyroidism and hyperthyroidism in the PD group were 1.25 (95% confidence interval (CI) 1.01–1.55, p = 0.044) and 1.37 (95% CI 1.13–1.67, p = 0.002), respectively. In subgroup analyses, the association between hypothyroidism and PD was maintained in men older than 70 years and the association between hyperthyroidism and PD was maintained in women younger than 70 years. Conclusion:Both hyperthyroidism and hypothyroidism were associated with higher risk of PD, particularly for women younger than 70 years and men older than 70 years, respectively.

Keywords: Hyperthyroidism, hypothyroidism, neurodegenerative disorder, Parkinson’s disease, pathophysiology, thyroid disease, thyroid dysfunction

DOI: 10.3233/JPD-202265

Journal: Journal of Parkinson's Disease, vol. 11, no. 1, pp. 211-220, 2021