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Raphael Thys
The patient was treated for HIV using stem cells from umbilical cord blood, a less invasive and risky method compared to bone marrow transplants. sukanya sitthikongsak via Getty Images
A woman of mixed race is the third person in the world believed to be cured of HIV after receiving a stem cell transplant from a donor naturally resistant to the virus, scientists announced last week. The success of the new method involving umbilical cord blood could allow doctors to help more people of diverse genders and racial backgrounds, Apoorva Mandavilli reports for the New York Times.
Two previous patients that appear to have been cured of HIV, the virus that causes AIDS, underwent a different treatment. Instead of using stem cells from umbilical cord blood, Timothy Brown and Adam Castillejo received a bone marrow transplant from donors with a genetic mutation that blocks HIV infection, reports Nicoletta Lanese for Live Science. Both bone marrow and umbilical cord blood, which is collected at the time of a baby's birth and donated by parents, contain adult hematopoietic stem cells. Those stem cells develop into all types of blood cells that support the immune system.
When the female patient needed umbilical cord blood as a treatment for leukemia, her doctors chose a donor with natural immunity to HIV with the hope of helping her fight both illnesses. According to doctors, the woman, who is keeping her identity private, has now been free of the virus for 14 months.
This was the first case of HIV treatment using umbilical cord blood, which is less invasive and more widely available than invasive bone marrow transplants that cured the two male patients. Cord blood donors don’t need to be matched as closely to the recipient as bone marrow donors, so it can be an option for patients with uncommon tissue types.
“The fact that she’s mixed race, and that she’s a woman, that is really important scientifically and really important in terms of the community impact,” Steven Deeks, an AIDS expert at the University of California, San Francisco who was not involved in the work, tells the Times.
Unlike the complications that both Brown and Castillejo suffered after their bone marrow transplants, the patient left the hospital 17 days after her procedure without any signs of graft versus host disease. All three patients that appear to be cured of HIV also had cancer and needed a stem cell transplant to save their lives, per Reuters.
Despite the apparent success of the treatment, it won’t be available to most of the 38 million people living with HIV around the world just yet. The recent treatment is part of a larger study that will follow a total of 25 people with HIV who receive cord blood stem cell transplants for the treatment of their cancer, and will likely initially only apply to those with aggressive cancers like leukemia, per reporters at Healthline.
"We estimate that there are approximately 50 patients per year in the U.S. who could benefit from this procedure," Koen van Besien, director of the stem cell transplant program at Weill Cornell Medicine and one of the doctors involved in the treatment, tells the Guardian’s Maya Yang. “The ability to use partially matched umbilical cord blood grafts greatly increases the likelihood of finding suitable donors for such patients.”