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Comment by jklein11 | Hacker News Reader

The way I understand it the claim that Biogen was making was that Aduhelm could reduce the amount of plaque in the brain. The thing that hasn’t been proven yet is the relationship between this plaque and Alzheimers.

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The only reason people care about reducing the amount of plaque in the brain is the belief that that ameliorates Alzheimer's. This was of course the primary intended endpoint of Biogen's trials, but (like other plaque-reducing drugs) the fact that it hasn't ameliorated Alzheimer's has caused many to abandon that belief.

Right, but if the FDA's job is to verify the claims made by Biogen then it shouldn't be a surprise that it was approved. Have there been any studies that show that plaque-reducing drugs don't ameliorate Alzheimer's? or is there just no evidence to support it yet?

The FDA scientific advisory committee rejected Biogen's claims in a unanimous vote. (Note that Biogen actually claimed in its application that aduhelm ameliorates Alzheimer's). The history of the aduhelm approval process just has a stench about it; you can see earlier posts by this author on the topic (linked to in the original article) to see some of that come out.

> Have there been any studies that show that plaque-reducing drugs don't ameliorate Alzheimer's?

There are, I believe, about a dozen drugs that tried to reduce plaques that have all failed to ameliorate Alzheimer's. And several of them despite actually demonstrating reduction of plaques.

Approving a drug based on a theory that it might help is not a good approach. If you're asking for approval to sell a drug to the public you need more than a hope. Some degree of solid proof that there are better outcomes with it than without seems a bare minimum threshold and Biogen couldn't clear it.

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