ST. LOUIS More than five years after a radical treatment, a San Francisco man and his German doctor are convinced that he remains the first person cured of infection with HIV, the virus that causes AIDS.

Timothy Ray Brown, who is known as "The Berlin Patient" because of where he was treated, and Dr. Gero Hutter made their first joint appearance in the U.S. on Wednesday when Hutter spoke at a symposium on gene therapy at Washington University in St. Louis. Scientists are studying whether gene therapy can be used to rid the body of HIV.

Brown, 46, was diagnosed with HIV in 1995. In 2006, he developed leukemia while living in Germany. Hutter performed a blood stem cell transplant using a donor with a rare gene mutation that provides natural resistance to HIV. Hutter said that resistance transferred to Brown.

Brown said he feels great, has not needed HIV medication since the 2007 surgery, and is now active in a foundation that seeks a cure for HIV.

Hutter said enough time has passed to say without hesitation that Brown is cured, citing the same five-year standard after which some cancer patients are said to be cured.

Brown, who now lives in San Francisco, grew up in Seattle and moved to Germany in 1993. After the HIV diagnosis he started on medication to prevent him from developing full-

blown AIDS.

He was attending a wedding in New York in 2006 when he became unusually tired. An avid cyclist, within weeks he could barely ride the bike and eventually was diagnosed with leukemia.

Brown underwent chemotherapy but needed a blood stem cell transplant and turned to Hutter, a blood specialist at Heidelberg University.

Hutter suggested they seek a donor with a certain cell feature that gives them natural resistance to HIV infection. Only about 1 percent of the northern European population has this feature. Hutter theorized that a transplant from such a donor could make the recipient resistant to HIV.

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Doctor claims cure for HIV, cites stem cell treatment