According to the article, it looks like some of the drugs didn’t do any better in trials than placebos, and in some cases made people do worse—one of the drugs is back in trials

"Given the difficulty of neurodegeneration therapy, it's hard to say if that result is an honest failure of a worthwhile idea, or whether the entire effort has been built on data that simply aren't real. But we cannot rule out the second possibility, at all." www.science.org/content/blog...

Fraud, So Much Fraud