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HIV Cure Achieved in Toronto Patient
9 May
Summary
- Toronto patient potentially cured of HIV after bone marrow transplant.
- Treatment involved rare genetic mutation and bone marrow transplant.
- This costly, risky method is not viable for most HIV patients.
A Toronto patient, known as the "Toronto patient," is nearing a potential cure for HIV, marking a significant medical milestone. Diagnosed with HIV in 1999, he developed a life-threatening blood cancer in 2021, necessitating a bone marrow transplant. This rare event allowed for an experimental treatment previously used on a small number of individuals globally.
The treatment involved a bone marrow transplant from a donor with a specific genetic mutation, delta-32 in the CCR5 gene, which prevents HIV from entering immune cells. This aggressive procedure, including high-dose chemotherapy, eradicated his existing immune system before transplanting the donor's virus-resistant stem cells.
Dr. Sharon Walmsley, director of the HIV/AIDS clinic at Toronto General Hospital, stated that if the patient remains undetectable for approximately another 20 months, he will be considered cured. While this represents a triumph, she cautioned that the invasive and risky nature of bone marrow transplants, with potential mortality rates of 10-20%, makes it unsuitable for most HIV patients.
This breakthrough offers hope for developing less invasive cures, though current antiretroviral therapies remain safe and effective. The high cost of this treatment, estimated at $300,000 in Canada, also highlights the need for more accessible solutions, particularly for regions with the greatest HIV burden.
The Toronto patient's case echoes that of the "London patient," Adam Castillejo, who was also cured of HIV through a similar procedure. Both cases underscore ongoing research efforts to find broadly applicable HIV cures.
