Link. Done with great care. “… 100 family members who carry the mutation will receive the drug every two weeks… Another 100 mutation carriers will receive a placebo. And because many people do not want to know if they have the mutation, researchers will also include 100 non-carriers in the study; they will receive a placebo.”

It is unlikely to work. We hope it will cause no harm. Even if it fails it will guide treatments for at least the youngest of this afflicted clan.

Note that it will probably be 5+ years before we get results. That’s a clue as to how far we are from having good Alzheimer’s prevention. We should have treated Alzheimer’s as an emergency 30 years ago, but of course 30 years from now people will say the same about our attitude to climate change.