A man from London has become the second person in the world to be cured of HIV, doctors say.
Adam Castillejo is still free of the virus more than 30 months after stopping anti-retroviral therapy.
He was not cured by the HIV drugs, however, but by a stem-cell treatment he received for a cancer he also had, the Lancet HIV journal reports.
The donors of those stem cells have an uncommon gene
