A new drug, donanemab, is being hailed as a turning point in the fight against Alzheimer's, after a global trial confirms it slows cognitive decline.

Drug donanemab seen as turning point in dementia fight
The antibody treatment donanemab slows clinical decline by around a third, a large trial confirms.
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The antibody medicine helps in the early stages of the disease by clearing a protein that builds up in the brains of people with this type of dementia.
Although not a cure, charities say the results in the journal JAMA mark a new era where Alzheimer's can be treated.
The UK's drugs watchdog has started assessing it for possible NHS use.
The drug works in Alzheimer's disease, not in other types of dementia, such as vascular dementia.
In the trials, it appears to have slowed the pace of the disease by about a third, allowing people to retain more of their day-to-day lives and tasks, such as making meals and enjoying a hobby.
It's not without its risks, however...
Although extremely promising, these drugs are not risk-free treatments.
Brain swelling was a common side-effect in up to a third of patients in the donanemab trial. For most, this resolved without causing symptoms. However, two volunteers, and possibly a third, died as a result of dangerous swelling in the brain.
Another antibody Alzheimer's drug, called aducanumab, was recently rejected by European regulators over safety concerns and a lack of evidence that it was effective enough for patients.