Bone marrow 'frees men of HIV drugs'
3 July 2013 Last updated at 11:34 BST
Two patients have been taken off their HIV drugs after bone-marrow transplants seemed to clear the virus from their bodies, doctors report.
One of the patients has spent nearly four months without taking medication with no sign of the virus returning.
The team at Brigham and Women's Hospital, in the US, cautioned that it was far too soon to talk about a cure as the virus could return at any point.
James Gallagher reports.