Could doctors in Germany have cured a man of AIDS?
They say the American man appears to have been cured, 20 months after getting a targeted bone marrow transplant that's normally used to fight leukemia.
Researchers -- and the doctors themselves -- warn that the case might be no more than a fluke.
But others say it may inspire a greater interest in gene therapy to fight the disease.
A German doctor says the 42-year-old patient was an American living in Berlin, who'd been infected with the AIDS virus for more than a decade.
He says 20 months after undergoing a transplant of genetically-selected bone marrow, he no longer shows signs of carrying the virus.
But the head of an HIV research lab at the Mayo Clinic says the tests probably weren't extensive enough to prove that the virus isn't there.