LONDON, England -- Researchers say a London man appears to be free of the AIDS virus after a stem cell transplant. It's the second such success since "Berlin patient" Timothy Ray Brown more than a decade ago.
Such transplants are dangerous and have failed in other patients. The new findings were published online Monday by the journal Nature.
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The London patient has not been identified. He was diagnosed with HIV in 2003. He developed cancer and agreed to a stem cell transplant to treat the cancer in 2016.
His doctors found a donor with a gene mutation that confers natural resistance to HIV.
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The transplant changed the London patient's immune system, giving him the donor's HIV resistance.