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  • BCG vaccine could have...

BCG vaccine could have protective effect against Alzheimer's disease: JAMA

Written By : Dr. Kamal Kant Kohli Published On 2023-05-22T11:15:43+05:30  |  Updated On 13 Feb 2024 11:35 PM IST
BCG vaccine could have protective effect against Alzheimers disease: JAMA
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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

Researchers have found in a new study that BCG vaccine could have protective effect against Alzheimer's disease.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.

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,” says Weinberg. “We are shifting our focus towards studying the potential benefits of BCG vaccination of older adults in Alzheimer’s disease–related clinical trials.”

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.

Reference:

Weinberg MS, Zafar A, Magdamo C, et al. Association of BCG Vaccine Treatment With Death and Dementia in Patients With Non–Muscle-Invasive Bladder Cancer. JAMA Netw Open. 2023;6(5):e2314336. doi:10.1001/jamanetworkopen.2023.14336.

JAMA Network OpenBCG vaccineAlzheimer
Source : JAMA Network Open
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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