A decision could arrive within weeks.

Protease inhibitors as a class of drugs are not new, Hsu said.

But they could be available soon.

Pfizer headquarters.

Pierre Suu / Contributor / Getty Images

Why Did Pfizer Stop Clinical Trials Early?

Trials are designed with pre-specified interim analyses to determine efficacy and safety, Chupp said.

Experts say the FDA will likely come to a decision sooner than previously expected.

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