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BCG vaccine associated with reduced risk of Alzheimer's disease and related dementias

Nicholas by Nicholas
May 19, 2023
in Health
0
BCG vaccine associated with reduced risk of Alzheimer's disease and related dementias

The Bacillus Calmette-Guérin (BCG) vaccine-;which prevents tuberculosis-;offers multiple beneficial effects, and it’s currently a recommended therapy for non–muscle-invasive bladder cancer. In a new study led by investigators at Massachusetts General Hospital (MGH) and Brigham and Women’s Hospital (BWH), treatment with the BCG vaccine was associated with a reduced risk of Alzheimer’s disease and related dementias. The findings are published in JAMA Network Open.

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Although previous research has suggested a link between the BCG vaccine and a lower risk of dementia, studies were limited by size, study design, or analytical methods. To conduct a more robust study, Marc Weinberg, MD, PhD, an Instructor in Psychiatry at MGH, along with co-first authors Colin Magdamo, BS, (MGH Neurology) and Affan Zafar, MD (MGH and BWH Urology), senior author Sudeshna Das, PhD, (MGH Neurology), and colleagues followed 6,467 individuals for up to 15 years after they were diagnosed with non–muscle-invasive bladder cancer. The group included 3,388 patients who underwent BCG vaccine treatment and 3,079 who served as controls, matched by factors such as age, sex, and medical co-morbidities.

During follow-up, 202 patients in the BCG vaccine group and 262 in the control group developed Alzheimer’s disease and related dementias. The incidence was 8.8 per 1,000 person-years and 12.1 per 1,000 person-years in the respective groups. Analyses revealed that treatment with the BCG vaccine was associated with a 20% lower risk of Alzheimer’s disease and related dementias. The protective association was greater in patients aged 70 years or older. Additionally, during follow-up, 751 patients in the BCG vaccine group and 973 in the control group died. Thus, treatment with BCG vaccine was associated with a 25% lower risk of death.

A vaccine like BCG, if proven effective, is a perfect example of a cost-effective, population-health–based solution to a devastating illness like Alzheimer’s disease. We are shifting our focus towards studying the potential benefits of BCG vaccination of older adults in Alzheimer’s disease–related clinical trials.”


Marc Weinberg, MD, PhD, Instructor in Psychiatry at MGH

If a causal link is found, it will be important to understand the mechanisms involved. Weinberg and his colleagues note that the BCG vaccine’s effects on the immune system may play a role.

Additional co-authors include Sun Young Chung, BS; Wesley H. Chou, MD; Madhur Nayan, MD, PhD; Mayuresh Deodhar, MS; Daniel M. Frendl, MD, PhD; Adam S. Feldman, MD, MPH; Denise L. Faustman, MD, PhD; Steven E. Arnold, MD; and Bella Vakulenko-Lagun, PhD.

This work was supported by the National Institutes of Health and the Alzheimer’s Association.

Source:

Massachusetts General Hospital

Journal reference:

Weinberg, M. S., et al. (2023) Association of BCG Vaccine Treatment With Death and Dementia in Patients With Non–Muscle-Invasive Bladder Cancer. JAMA Network Open. doi.org/10.1001/jamanetworkopen.2023.14336.

Tags: Alzheimer's DiseaseBCG VaccineBladderBladder CancerCancerDementiaHospitalmuscleNeurologyResearchTuberculosisVaccine

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