Myriad Genetics immediately pulled the drug and its stock fell almost $3/share. The company said it will concentrate on genetic testing after presenting its findings in detail later this month.
Flurizan aimed to stop development of all amyloid plaques. Gamma-secretase modulators (GSMs) only go after the long ones. The idea is that just as there is good and bad cholesterol, there are good and bad amyloids. Long strings bad, short strings good.
By increasing the number of short strings, which also act to prevent development of the long strings, you can keep them from collecting and blocking brain arteries. That's the theory, anyway.
Theory is one thing, practice another. Flurizan had good theories behind it but failed to help patients in practice. The Alzheimer's community is keeping its fingers crossed.