They need to first bring a drug to market. That's the smart approach. The reality is that most effective cures are not one drug miracle pills. AIDS is treated with a cocktail of drugs all at just the right dose, Chemo for cancer is a complicated proses involving alternating several drugs at very specific doses and intervals. It's hard to get this right, without extensive trial and error. The FDA trial process is rigid and expensive. It becomes much easier once a drug is in legal use with real patients. I think that's their goal in first getting approval for advanced AD, given the clear benefit and safety seems like they will get it done.
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