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OBJECTIVE: To investigate the association between type 2 diabetes mellitus (T2DM) and subsequent Parkinson disease (PD). METHODS: Linked English national Hospital Episode Statistics and mortality data (1999-2011) were used to conduct a retrospective cohort study. A cohort of individuals admitted for hospital care with a coded diagnosis of T2DM was constructed, and compared to a reference cohort. Subsequent PD risk was estimated using Cox regression models. Individuals with a coded diagnosis of cerebrovascular disease, vascular parkinsonism, drug-induced parkinsonism, and normal pressure hydrocephalus were excluded from the analysis. RESULTS: A total of 2,017,115 individuals entered the T2DM cohort and 6,173,208 entered the reference cohort. There were significantly elevated rates of PD following T2DM (hazard ratio [HR] 1.32, 95% confidence interval [CI] 1.29-1.35; p < 0.001). The relative increase was greater in those with complicated T2DM (HR 1.49, 95% CI 1.42-1.56) and when comparing younger individuals (HR 3.81, 95% CI 2.84-5.11 in age group 25-44 years). CONCLUSIONS: We report an increased rate of subsequent PD following T2DM in this large cohort study. These findings may reflect shared genetic predisposition and/or disrupted shared pathogenic pathways with potential clinical and therapeutic implications.

Original publication

DOI

10.1212/WNL.0000000000005771

Type

Journal article

Journal

Neurology

Publication Date

10/07/2018

Volume

91

Pages

e139 - e142

Keywords

Adult, Age Factors, Aged, Case-Control Studies, Comorbidity, Diabetes Mellitus, Type 2, England, Female, Humans, Male, Middle Aged, Parkinson Disease, Retrospective Studies, Risk Factors