Paul Edmonds, 68, is the fifth known person in the world to achieve remission from leukemia and HIV. Edmonds contracted leukemia in 2018, three decades after being diagnosed with HIV.

After years of unsuccessful treatments, Edmonds said he had undergone “remarkable and encouraging’ therapy with stem cells from a donor with a rare genetic mutation that causes resistance to acquiring HIV in those who have it. No more than 2% of people have this mutation, which is why doctors consider Edmonds lucky to find a compatible donor.