A second person has
experienced sustained remission from HIV-1 after ceasing treatment, reports a
paper led by researchers at UCL and Imperial College London.
The case report, published in Nature and carried out with partners
at the University of Cambridge and the University of Oxford, comes ten years
after the first such case, known as the 'Berlin Patient.'
Both patients were treated with stem cell transplants from
donors carrying a genetic mutation that prevents expression of an HIV receptor
CCR5.
The subject of the new study has been in remission for 18 months
after his antiretroviral therapy (ARV) was discontinued. The authors say it is
too early to say with certainty that he has been cured of HIV, and will continue
to monitor his condition.
"Finding a way to
eliminate the virus entirely is an urgent global priority, but is particularly
difficult because the virus integrates into the white blood cells of its
host."
Close to 37 million people are living with HIV worldwide, but
only 59% are receiving ARV, and drug-resistant HIV is a growing concern. Almost
one million people die annually from HIV-related causes.
The report describes a male patient in the UK, who prefers to
remain anonymous, and was diagnosed with HIV infection in 2003 and on
antiretroviral therapy since 2012.
Later in 2012, he was diagnosed with advanced Hodgkin's
Lymphoma. In addition to chemotherapy, he underwent a haematopoietic stem cell
transplant from a donor with two copies of the CCR5Δ32 allele in 2016.
CCR5 is the most commonly used receptor by HIV-1. People who
have two mutated copies of the CCR5 allele are resistant to the HIV-1 virus
strain that uses this receptor, as the virus cannot enter host cells.
The transplant was relatively uncomplicated, but with some side
effects including mild graft-versus-host disease, a complication of transplants
wherein the donor immune cells attack the recipient's immune cells.
The patient remained on ARV for 16 months after the transplant,
at which point the clinical team and the patient decided to interrupt ARV
therapy to test if the patient was truly in HIV-1 remission.
Regular testing confirmed that the patient's viral load remained
undetectable, and he has been in remission for 18 months since ceasing ARV
therapy (35 months post-transplant). The patient's immune cells remain unable
to express the CCR5 receptor.
The transplant was relatively uncomplicated, but with some side
effects including mild graft-versus-host disease, a complication of transplants
wherein the donor immune cells attack the recipient's immune cells.
The patient remained on ARV for 16 months after the transplant,
at which point the clinical team and the patient decided to interrupt ARV
therapy to test if the patient was truly in HIV-1 remission.
Source: University College London
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