Why a drug treatment for dementia has eluded us

Finding a cure for neurodegenerative diseases such as Alzheimer’s is challenging. They’re difficult to diagnose, and drugs struggle to get into the brain as the brain’s blood supply is largely separate to the rest of the body. Not surprisingly, several companies have left this territory in recent years. This week, pharmaceutical giant Pfizer announced it will stop research into developing drugs to treat Alzheimer’s disease, after costly failed attempts over the past decade.

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