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The fight over an experimental treatment for Alzheimer’s disease from Cassava Sciences likely won’t be resolved for years.

That’s the only certain takeaway from Thursday’s decision by the Food and Drug Administration to deny — on a technicality — several citizen petitions against Cassava and its drug, called simufilam. Investors who are long and short Cassava’s stock will now wait three years or more until two, recently started Phase 3 studies are completed and the results read out.


Two scientists (also shorting Cassava) filed the petitions starting last August, asking the FDA to halt the company’s clinical trials based on allegations of manipulated Western blot images and fraudulent laboratory biomarker data.

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