The London patient, who was being treated for cancer, has now been in remission for 18 months and is no longer taking HIV drugs.
The researchers say it’s too early to say the patient is ‘cured’ of HIV.
Experts caution the approach is not practical for healthy people with HIV, but may ultimately help find a cure.
The male ‘London’ patient, who has not been named, was diagnosed with HIV in 2003 and advanced Hodgkin’s lymphoma in 2012.
He had chemotherapy to treat the Hodgkin’s cancer and, in addition, stem cells were implanted into the patient from a donor resistant to HIV, leading to both his cancer and HIV going into remission.
Researchers from University College London, Imperial College London, Cambridge and Oxford Universities were all involved in the case.This is the second time a patient treated this way has ended up in remission from HIV.
Ten years ago, another patient in Berlin received a bone marrow transplant from a donor with natural immunity to the virus.
Timothy Brown, said to be the first person to ‘beat’ HIV/AIDS, was given two transplants and total body irradiation (radiotherapy) for leukaemia – a much more aggressive treatment.
“By achieving remission in a second patient using a similar approach, we have shown that the Berlin Patient was not an anomaly, and that it really was the treatment approaches that eliminated HIV in these two people,” said lead study author Prof Ravindra Gupta from UCL.
Prof Eduardo Olavarria, also involved in the research, from Imperial College London, said the success of stem cell transplantation offered “hope in the search for a long-awaited cure for HIV/AIDS”.CCR5 is the most commonly used receptor by HIV-1, the virus strain of HIV that dominates around the world – to enter cells.
But a very small number of people who are resistant to HIV have two mutated copies of the CCR5 receptor.
This means the virus cannot get into cells in the body that it normally infects.
The London patient received stem cells from a donor with this specific genetic mutation, which also made him resistant to HIV.
But a reservoir of cells carrying HIV can still remain in the body, in a resting state, for many years.
The UK researchers say it may be possible to use gene therapy to target the CCR5 receptor in people with HIV, now they know the Berlin patient’s recovery was not a one-off.Prof Graham Cooke, NIHR research professor and reader in infectious diseases from Imperial College London, said the results were “encouraging”.
“If we can understand better why the procedure works in some patients and not others, we will be closer to our ultimate goal of curing HIV.
“At the moment the procedure still carries too much risk to be used in patients who are otherwise well.”
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