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30 Jul 2022

Oldest patient yet cured of HIV after stem cell transplant

文字Gareth Johnson

The patient is the fourth to be cured of HIV after receiving a stem cell transplant that was originally intended to treat his leukaemia.

LONDON, July 27 (Reuters) - The oldest patient yet has been cured of HIV after receiving a stem cell transplant for leukaemia, researchers reported on Wednesday.
While the transplant was planned to treat the now-66-year-old's leukaemia, the doctors also sought a donor who was naturally resistant to the virus that causes AIDS, a mechanism that first worked to cure the "Berlin patient", Timothy Ray Brown, in 2007.
The latest patient, the fourth to be cured in this way, is known as the "City of Hope" patient after the U.S. facility in Duarte, California, where he was treated, because he does not want to be identified.
As well as being the oldest, the patient has also had HIV the longest, having been diagnosed in 1988 with what he described as a "death sentence" that killed many of his friends.
He has been on antiretroviral therapy (ART) to control his condition for more than 30 years.
Doctors who presented the data ahead of the International Aids Society's (IAS) 2022 meeting said the case opened up the potential for older patients with HIV and blood cancer to access the treatment, particularly as the stem cell donor was not a family member.
HOPE
Describing a cure as the "holy grail", Sharon Lewin, president-elect of the IAS, said the case provided "continued hope ... and inspiration" for people with HIV and the wider scientific community, although it was unlikely to be an option for most people with HIV due to the risks of the procedure.
Scientists think the process works because the donor individual's stem cells have a specific, rare genetic mutation which means they lack the receptors used by HIV to infect cells.
After the transplant three and a half years ago, which followed chemotherapy, the City of Hope patient stopped taking ART in March 2021. He has now been in remission from both HIV and leukaemia for more than a year, the team said.
On Wednesday, researchers in Spain also presented details of a 59-year-old woman who is one of a rare group of what is known as "post-treatment controllers". They can maintain undetectable viral loads after stopping ART, and also provide clues to a potential cure, Lewin said.
Ahead of the IAS conference that starts on Friday, the Joint United Nations Programme on HIV/AIDS (UNAIDS) also presented data showing how the COVID-19 pandemic had derailed global efforts to tackle HIV, including a reversal of progress in the world's most populous region, Asia and the Pacific.

It's been confirmed by researchers that the oldest patient yet has been cured of HIV after receiving a stem cell transplant for leukaemia.

While the transplant was planned to treat the now-66-year-old's leukaemia, the doctors also sought a donor who was naturally resistant to the virus that causes AIDS, a mechanism that first worked to cure the "Berlin patient", Timothy Ray Brown, in 2007.

The latest patient, the fourth to be cured in this way, is known as the "City of Hope" patient after the U.S. facility in Duarte, California, where he was treated - the person does not want to be publicly identified.

As well as being the oldest, the patient has also had HIV the longest, having been diagnosed in 1988. The patient has been on antiretroviral therapy (ART) to control their condition for more than 30 years.

After the transplant three and a half years ago, which followed chemotherapy, the City of Hope patient stopped taking ART in March 2021. He has now been in remission from both HIV and leukaemia for more than a year.

Scientists think the process works because the donor individual's stem cells have a specific, rare genetic mutation which means they lack the receptors used by HIV to infect cells.

Doctors who presented the data about the treatment said that the case opened up the potential for older patients with HIV and blood cancer to access the treatment, particularly as the stem cell donor was not a family member. However this kind of stem-cell transplant is unlikely to be an option for most people with HIV due to the risks of the procedure.

How close are we to a vaccine against HIV?

While the two-pronged strategy of PrEP and U=U (Undetectable equals Untransmittable) has given us the tools to minimise the acquisition of HIV, the prospect of a vaccine against the virus is undoubtedly a game-changer.

To date, it’s been difficult to develop a vaccine against HIV because the virus mutates so quickly. But it appears that the science used to tackle Covid-19 could also be effective against HIV.

Moderna is a bio-tech company that successfully developed a vaccine against Covid-19. Moderna (and also Pfizer) used mRNA technology for its vaccine. This enables scientists to create a vaccine that can target multiple variants of a virus.

Moderna has now applied that mRNA technology in the development of a vaccine against HIV. Moderna has recently announced that they’ve begun human trials of this vaccine against HIV.

It’s not clear what the timeline could potentially be if these human trials are successful – the vaccine would then need to go through regulatory approval before going into production. However, human trials is a fairly advanced stage of the development process, and regulators around the world have tested and approved the mRNA technology used by the HIV vaccine – all of which would speed up the process.

In the meantime, PrEP and U=U remains our best strategy for protecting each other and limiting the transmission of HIV.

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