A Toronto man could soon join a small club of people in the world considered cured of HIV following a bone marrow transplant to treat cancer that left the immunodeficiency virus in remission.

The 62-year-old man, identified by the health officials only as the “Toronto patient,” had developed acute myelogenous leukemia in 2021 and underwent a bone marrow transplant at University Health Network’s Princess Margaret Cancer Centre.

The procedure involved donor stem cells that were selected because they contained a rare genetic mutation called “delta-32.”