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April 25, 2017; 88 (17) Article

Viral hepatitis and Parkinson disease

A national record-linkage study

Julia Pakpoor, Alastair Noyce, Raph Goldacre, Marianna Selkihova, Stephen Mullin, Anette Schrag, Andrew Lees, Michael Goldacre
First published March 29, 2017, DOI: https://doi.org/10.1212/WNL.0000000000003848
Julia Pakpoor
From the Unit of Health-Care Epidemiology (J.P., R.G., M.G.), Nuffield Department of Population Health, University of Oxford; and UCL Institute of Neurology (A.N., M.S., S.M., A.S., A.L.), Queen Square, London, UK.
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Alastair Noyce
From the Unit of Health-Care Epidemiology (J.P., R.G., M.G.), Nuffield Department of Population Health, University of Oxford; and UCL Institute of Neurology (A.N., M.S., S.M., A.S., A.L.), Queen Square, London, UK.
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Raph Goldacre
From the Unit of Health-Care Epidemiology (J.P., R.G., M.G.), Nuffield Department of Population Health, University of Oxford; and UCL Institute of Neurology (A.N., M.S., S.M., A.S., A.L.), Queen Square, London, UK.
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Marianna Selkihova
From the Unit of Health-Care Epidemiology (J.P., R.G., M.G.), Nuffield Department of Population Health, University of Oxford; and UCL Institute of Neurology (A.N., M.S., S.M., A.S., A.L.), Queen Square, London, UK.
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Stephen Mullin
From the Unit of Health-Care Epidemiology (J.P., R.G., M.G.), Nuffield Department of Population Health, University of Oxford; and UCL Institute of Neurology (A.N., M.S., S.M., A.S., A.L.), Queen Square, London, UK.
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Anette Schrag
From the Unit of Health-Care Epidemiology (J.P., R.G., M.G.), Nuffield Department of Population Health, University of Oxford; and UCL Institute of Neurology (A.N., M.S., S.M., A.S., A.L.), Queen Square, London, UK.
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Andrew Lees
From the Unit of Health-Care Epidemiology (J.P., R.G., M.G.), Nuffield Department of Population Health, University of Oxford; and UCL Institute of Neurology (A.N., M.S., S.M., A.S., A.L.), Queen Square, London, UK.
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Michael Goldacre
From the Unit of Health-Care Epidemiology (J.P., R.G., M.G.), Nuffield Department of Population Health, University of Oxford; and UCL Institute of Neurology (A.N., M.S., S.M., A.S., A.L.), Queen Square, London, UK.
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Citation
Viral hepatitis and Parkinson disease
A national record-linkage study
Julia Pakpoor, Alastair Noyce, Raph Goldacre, Marianna Selkihova, Stephen Mullin, Anette Schrag, Andrew Lees, Michael Goldacre
Neurology Apr 2017, 88 (17) 1630-1633; DOI: 10.1212/WNL.0000000000003848

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Abstract

Objective: To study associations between viral hepatitis and Parkinson disease (PD).

Methods: A retrospective cohort study was done by analyzing linked English National Hospital Episode Statistics and mortality data (1999–2011). Cohorts of individuals with hepatitis B, hepatitis C, autoimmune hepatitis, chronic active hepatitis, and HIV were constructed, and compared to a reference cohort for subsequent rates of PD.

Results: The standardized rate ratio (RR) of PD following hepatitis B was 1.76 (95% confidence interval [CI] 1.28–2.37) (p < 0.001), based on 44 observed compared with 25 expected cases. The RR of PD following hepatitis C was 1.51 (95% CI, 1.18–1.9) (p < 0.001), based on 48.5 expected and 73 observed cases. There was no significant association between autoimmune hepatitis, chronic active hepatitis or HIV, and subsequent PD. When including only those episodes of care for PD that occurred first at least 1 year following each exposure condition, the RR for hepatitis B and hepatitis C were 1.82 (1.29–2.5) and 1.43 (1.09–1.84), respectively.

Conclusions: We report strong evidence in favor of an elevation of rates of subsequent PD in patients with hepatitis B and hepatitis C. These findings may be explained by factors peculiar to viral hepatitis, but whether it reflects consequences of infection, shared disease mechanisms, or the result of antiviral treatment remains to be elucidated. Further work is needed to confirm this association and to investigate pathophysiologic pathways, potentially advancing etiologic understanding of PD more broadly.

GLOSSARY

CI=
confidence interval;
HCV=
hepatitis C virus;
HES=
English National Hospital Episode Statistics;
ICD-10=
International Classification of Diseases–10;
PD=
Parkinson disease;
RR=
rate ratio

Footnotes

  • ↵* These authors contributed equally to this work.

  • Go to Neurology.org for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.

  • Editorial, page 1596

  • Received June 29, 2016.
  • Accepted in final form January 25, 2017.
  • © 2017 American Academy of Neurology
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