A breakthrough in HIV remission challenges the rules of genetic resistance

Science · Published 13 October 2026 Swipe more like this →

In short: For years, the path to an HIV cure seemed to require a rare genetic mutation that blocks the virus entirely. But a new case of full remission suggests we might be able to achieve the same result using different biological mechanisms, potentially opening the door to more accessible treatments.

HIV remains a global challenge, with approximately 36.9 million people living with the virus as of 2017. While antiretroviral therapy (ART) is the standard of care, it requires lifelong adherence. A 'cure' is exceptionally rare; only six cases have been documented among an estimated 88 million people who have acquired HIV since the start of the epidemic. Historically, these successes—including the pioneering 'Berlin Patient'—involved allogeneic stem cell transplants (allo-SCTs) for blood cancers using donors with a specific homozygous CCR5Δ32 mutation. This mutation prevents the virus from entering host cells by removing a primary receptor.

The recent report of a second-ever case of full remission marks a significant conceptual shift. Unlike previous cases, this patient received a transplant from a donor who was heterozygous (carrying only one copy of the mutation) and possessed functionally active CCR5 receptors. Despite this, the patient has maintained undetectable plasma HIV RNA for more than six years after discontinuing ART. Reservoir analysis confirmed that while intact proviral HIV existed before the transplant, no replication-competent virus was found in the blood or intestinal tissues afterward.

This discovery suggests that CCR5Δ32-mediated resistance is not the only way to achieve durable remission. The viral reservoir might have been eliminated during the transplant process due to significant antibody-dependent cellular cytotoxicity levels. This is vital because it suggests that if we can find ways to reduce the viral reservoir effectively—perhaps through gene editing or other interventions—we might reach long-term control without needing the rare homozygous mutation. While these cases are currently limited to patients with life-threatening malignancies, they provide a new roadmap for HIV cure strategies.

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