Timothy Ray Brown. He was HIV-positive and developed leukemia. His cancer treatment involved him receiving a stem cell transplant to reboot his immune system.He received stem cells in 2007 from someone with a rare, genetic resistance to HIV.
Brown went on to develop his resistance to HIV and appeared cured. Even off anti-HIV medication, his HIV never returned. Brown died in Palm Springs in 2020 when his cancer eventually returned.
This was not related to his HIV status. Since then, half a dozen similar other individuals have been cured of HIV after receiving stem cell transplants.
However, such transplants are extremely costly, grueling procedures that carry their own risks. Patients have to take immunosuppressive drugs afterward.