CytoDyn’s lead candidate for HIV is part of a new class of therapies that work by protecting healthy cells by blocking viral infection. But the receptor that the drug targets also plays a role in cancer metastasis and may provide a new approach to treating a wide range of cancers. We spoke to Richard Pestell, chief medical officer of CytoDyn, about the drug, how it works, and why it may have value in a range of serious medical conditions.