A UK patient's HIV has become "undetectable" following a stem cell transplant - in only the second case of its kind, doctors report in Nature.
This is the second time a patient treated this way has ended up in remission from HIV.
Although the finding is exciting, it is not offering up a new treatment for the millions of people around the world living with HIV.
CCR5 is the most commonly used receptor by HIV-1 - the virus strain of HIV that dominates around the world - to enter cells.
Dr Andrew Freedman, reader in infectious diseases and honorary consultant physician at Cardiff University, said it was an "interesting and potentially significant report".