Forgive my ignorance, are they allowed to put them

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Forgive my ignorance, are they allowed to put them on a PD-L1 inhibitor in the middle of a trial when that isn't part of the protocol?

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I've ran across a few protocol filings for the FDA. Everything in the FDA filings is not necessarily everything that is at clinicaltrials.gov. But Cytodyn may update the information at some point at clinicaltrials.gov.