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. 2021 Jan;36(1):106-117.
doi: 10.1002/mds.28312. Epub 2020 Oct 1.

Differences in the Presentation and Progression of Parkinson's Disease by Sex

Affiliations

Differences in the Presentation and Progression of Parkinson's Disease by Sex

Hirotaka Iwaki et al. Mov Disord. 2021 Jan.

Abstract

Background: Previous studies reported various symptoms of Parkinson's disease (PD) associated with sex. Some were conflicting or confirmed in only one study.

Objectives: We examined sex associations to PD phenotypes cross-sectionally and longitudinally in large-scale data.

Methods: We tested 40 clinical phenotypes, using longitudinal, clinic-based patient cohorts, consisting of 5946 patients, with a median follow-up of 3.1 years. For continuous outcomes, we used linear regressions at baseline to test sex-associated differences in presentation, and linear mixed-effects models to test sex-associated differences in progression. For binomial outcomes, we used logistic regression models at baseline and Cox regression models for survival analyses. We adjusted for age, disease duration, and medication use. In the secondary analyses, data from 17 719 PD patients and 7588 non-PD participants from an online-only, self-assessment PD cohort were cross-sectionally evaluated to determine whether the sex-associated differences identified in the primary analyses were consistent and unique to PD.

Results: Female PD patients had a higher risk of developing dyskinesia early during the follow-up period, with a slower progression in activities of daily living difficulties, and a lower risk of developing cognitive impairments compared with male patients. The findings in the longitudinal, clinic-based cohorts were mostly consistent with the results of the online-only cohort.

Conclusions: We observed sex-associated contributions to PD heterogeneity. These results highlight the necessity of future research to determine the underlying mechanisms and importance of personalized clinical management. © 2020 International Parkinson and Movement Disorder Society.

Keywords: Parkinson's disease; gender; sex; dyskinesias; cognitive impairment; activities of daily livings.

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Conflict of interest statement

Relevant conflicts of interests/financial disclosures: Nothing to report.

Figures

FIG. 1.
FIG. 1.
Forest plots depicting sex differences in outcomes in progression analyses. DATATOP, Deprenyl and Tocopherol Antioxidative Therapy of Parkinsonism; DIGPD, Drug Interaction with Genes in Parkinson’s Disease; HBS, Harvard Biomarkers Study; NET-PD_LS1, NIH Exploratory Trials in Parkinson’s Disease Large Simple Study 1; PARKFIT, ParkFit study; PARKWEST, The Norwegian ParkWest study; PDBP, Parkinson’s Disease Biomarker Program; PICNICS, Parkinsonism Incidence and Cognitive and Non-motor heterogeneity In Cambridgeshire; PPMI, Parkinson’s Progression Markers Initiative; PreCEPT_PostCEPT, Parkinson Research Examination of CEP-1347 Trial and PostCEPT; PROPARK, Profiling Parkinson’s disease study; and UDALL_PENN, Morris K. Udall Centers for Parkinson’s Research.P, non-adjusted P-values; I_sq, I2 statistic; QEp, test of heterogeneity. “_scaled” scores were normalized (mean 0, standard deviation of 1) to the baseline distributions as the original scores.
FIG. 2.
FIG. 2.
Forest plots depicting sex differences in outcomes in baseline analyses. DATATOP, Deprenyl and Tocopherol Antioxidative Therapy of Parkinsonism; DIGPD, Drug Interaction with Genes in Parkinson’s Disease; HBS, Harvard Biomarkers Study; NET-PD_LS1, NIH Exploratory Trials in Parkinson’s Disease Large Simple Study 1; PARKFIT, ParkFit study; PARKWEST, The Norwegian ParkWest study; PDBP, Parkinson’s Disease Biomarker Program; PICNICS, Parkinsonism Incidence and Cognitive and Non-motor heterogeneity In Cambridgeshire; PPMI, Parkinson’s Progression Markers Initiative; PreCEPT_PostCEPT, Parkinson Research Examination of CEP-1347 Trial and PostCEPT; PROPARK, Profiling Parkinson’s disease study; and UDALL_PENN, Morris K. Udall Centers for Parkinson’s Research.P, non-adjusted P-values; I_sq, I2 statistic; QEp, test of heterogeneity. “_scaled” scores were normalized (mean 0, standard deviation of 1) to the baseline distributions as the original scores

Comment in

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