LONDON (Reuters) - Timothy Ray Brown, the first person known to be cured of HIV when he had a unique type of bone marrow transplant, has died in California after relapsing with cancer, his partner said.

FILE PHOTO: Timothy Ray Brown, also known as "The Berlin Patient," smiles during a news conference held by the World AIDS Institute in Washington July 24, 2012. Brown is thought to be the first patient ever to be cured of HIV infection. REUTERS/Kevin Lamarque

It is with great sadness that I announce that Timothy passed away ... this afternoon surrounded by myself and friends, after a 5 month battle with leukaemia, his partner, Tim Hoeffgen, said in a post on Facebook. He said Brown was his hero and the sweetest person in the world.

Brown, born on March 11, 1966, became known as the Berlin Patient after his HIV was cleared by treatment there in 2007.

The Americans case fascinated and inspired a generation of HIV doctors as well as patients infected with the virus that causes AIDS, offering a glimmer of hope that one day a cure will be found that eventually ends the AIDS pandemic.

We owe Timothy and his doctor, Gero Huetter, a great deal of gratitude for opening the door for scientists to explore the concept that a cure for HIV is possible, said Adeeba Kamarulzaman, president of the International AIDS Society (IAS).

Brown was diagnosed with HIV in 1995 while living in the German capital, and in 2006 was also diagnosed with a type of blood cancer known as acute myeloid leukaemia.

While Brown remained clear of HIV for more than a decade after being treated, he had suffered a relapse of the leukaemia in the past year. His doctors said the blood cancer had spread to his spine and brain, and he had recently been in hospice care in his home town of Palm Springs, California.

Im heartbroken that my hero is now gone. Tim was truly the sweetest person in the world, Hoeffgen said in the Facebook post. He said Brown had made it his lifes work to tell the story of his HIV cure and became an ambassador of hope.

For Huetter, the German doctor caring for him in 2007, Browns case was a shot in the dark. The treatment involved the destruction of Browns immune system and the transplanting of stem cells with a gene mutation called CCR5 that resists HIV.

Only a tiny proportion of people most of them of northern European descent have the CCR5 mutation that makes them resistant to the AIDS-causing virus.

This and other factors made the treatment Brown had expensive, complex and highly risky. Most experts say it could never become a way to cure all HIV patients, since many of them would risk death from the procedure itself.

More than 37 million people worldwide are currently infected with HIV, and the AIDS pandemic has killed about 35 million people since it began in the 1980s.

Medical advances over the past three decades have led to the development of drug combinations known as antiretroviral therapies that can keep the virus in check, allowing many HIV positive people to live with the virus for years.

A second HIV patient, Adam Castillejo, who was known as the London patient until he revealed his identity this year, is also thought to be in remission from HIV after having a transplant in 2016 similar to the one Brown had.

Sharon Lewin, president-elect of the IAS and an HIV specialist at Australias Doherty Institute, said Brown was a champion and advocate for keeping an HIV cure on the agenda.

It is the hope of the scientific community that one day we can honour his legacy with a safe, cost-effective and widely accessible strategy to achieve HIV remission and cure.

Reporting by Kate Kelland, editing by Gareth Jones and Nick Macfie

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