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April 22, 2014; 82 (16) Article

Faster cognitive decline in elders without dementia and decreased risk of cancer mortality

NEDICES Study

Julián Benito-León, Juan Pablo Romero, Elan D. Louis, Félix Bermejo-Pareja
First published April 9, 2014, DOI: https://doi.org/10.1212/WNL.0000000000000350
Julián Benito-León
From the Department of Neurology (J.B.-L., J.P.R., F.B.-P.), University Hospital 12 de Octubre, Madrid; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (J.B.-L., F.B.-P.); Department of Medicine (J.B.-L., F.B.-P.), Complutense University, Madrid, Spain; G.H. Sergievsky Center (E.D.L.), Department of Neurology (E.D.L.), and Taub Institute for Research on Alzheimer's Disease and the Aging Brain (E.D.L.), College of Physicians and Surgeons, and Department of Epidemiology (E.D.L.), Mailman School of Public Health, Columbia University, New York.
MD, PhD
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Juan Pablo Romero
From the Department of Neurology (J.B.-L., J.P.R., F.B.-P.), University Hospital 12 de Octubre, Madrid; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (J.B.-L., F.B.-P.); Department of Medicine (J.B.-L., F.B.-P.), Complutense University, Madrid, Spain; G.H. Sergievsky Center (E.D.L.), Department of Neurology (E.D.L.), and Taub Institute for Research on Alzheimer's Disease and the Aging Brain (E.D.L.), College of Physicians and Surgeons, and Department of Epidemiology (E.D.L.), Mailman School of Public Health, Columbia University, New York.
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Elan D. Louis
From the Department of Neurology (J.B.-L., J.P.R., F.B.-P.), University Hospital 12 de Octubre, Madrid; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (J.B.-L., F.B.-P.); Department of Medicine (J.B.-L., F.B.-P.), Complutense University, Madrid, Spain; G.H. Sergievsky Center (E.D.L.), Department of Neurology (E.D.L.), and Taub Institute for Research on Alzheimer's Disease and the Aging Brain (E.D.L.), College of Physicians and Surgeons, and Department of Epidemiology (E.D.L.), Mailman School of Public Health, Columbia University, New York.
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Félix Bermejo-Pareja
From the Department of Neurology (J.B.-L., J.P.R., F.B.-P.), University Hospital 12 de Octubre, Madrid; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (J.B.-L., F.B.-P.); Department of Medicine (J.B.-L., F.B.-P.), Complutense University, Madrid, Spain; G.H. Sergievsky Center (E.D.L.), Department of Neurology (E.D.L.), and Taub Institute for Research on Alzheimer's Disease and the Aging Brain (E.D.L.), College of Physicians and Surgeons, and Department of Epidemiology (E.D.L.), Mailman School of Public Health, Columbia University, New York.
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Faster cognitive decline in elders without dementia and decreased risk of cancer mortality
NEDICES Study
Julián Benito-León, Juan Pablo Romero, Elan D. Louis, Félix Bermejo-Pareja
Neurology Apr 2014, 82 (16) 1441-1448; DOI: 10.1212/WNL.0000000000000350

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Abstract

Objective: To assess whether faster cognitive decline in elders without dementia is associated with decreased risk of cancer mortality.

Methods: In this population-based, prospective study of 2,627 people without dementia aged 65 years and older (Neurological Disorders in Central Spain), a 37-item version of the Mini-Mental State Examination (37-MMSE) was administered at 2 visits (baseline and follow-up, approximately 3 years later). We divided change in 37-MMSE into tertiles (lower tertile ≥2 point improvement in score, higher tertile ≥2 point decline in score). Community-dwelling elders were followed for a median of 12.9 years, after which the death certificates of those who died were examined.

Results: A total of 1,003 (38.2%) died, including 339 (33.8%) deaths among participants who were in the higher tertile of 37-MMSE change and 664 (66.2%) deaths among those in the remaining tertiles. Cancer was reported significantly less often in those in the higher tertile of MMSE change (20.6%) than in those in the remaining tertiles (28.6%): in an unadjusted Cox model, hazard ratio for cancer mortality in participants within the higher tertile = 0.75 (p = 0.04) compared with the participants within the remaining tertiles. In a Cox model that adjusted for a variety of demographic factors and comorbidities, hazard ratio for cancer mortality in participants within the higher tertile = 0.70 (p = 0.01).

Conclusion: In this population-based, prospective study of community-dwelling elders without dementia, faster cognitive decline was associated with a decreased risk of cancer mortality. Further studies are required to elucidate this inverse association in elders without dementia.

GLOSSARY

AD=
Alzheimer disease;
CI=
confidence interval;
DSM-IV=
Diagnostic and Statistical Manual of Mental Disorders, 4th edition;
HR=
hazard ratio;
ICD-9=
International Classification of Diseases, ninth revision;
MMSE=
Mini-Mental State Examination;
37-MMSE=
37-item Mini-Mental State Examination;
NEDICES=
Neurological Disorders in Central Spain

Footnotes

  • 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.

  • Supplemental data at Neurology.org

  • Received November 20, 2013.
  • Accepted in final form January 15, 2014.
  • © 2014 American Academy of Neurology
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