The unexpected success has launched a new round of discussion about a potential cure for HIV. He is the second patient after Mr Brown to remain virus-free for more than a year after stopping ARVs.
What makes Brown's treatment unique was that doctors used transplanted material from a donor known to have a genetic resistance to HIV in hopes that when his immune system was rebuilt with the new cells, it could fight off the virus.
Around 22,000 people are known have the CCR5 mutation, and they are mostly northern European.
The term "cure" is contentious.
Doctors are saying that a third person's HIV has been effectively cured, and there might be more soon.
The man was diagnosed with HIV in 2003 and started taking ART in 2012. In fact, amFAR in part funded the London patient's research intervention. "We need to understand if we could knock out this (CCR5) receptor in people with HIV, which may be possible with gene therapy", he said.
The apparent cure of the "London patient", who has not been identified, follows several unsuccessful efforts to replicate the 2008 experience of Timothy Brown, the "Berlin patient" who underwent treatment for leukemia and gained a robust resistance to HIV in the process.
Peace Region unemployment rate second-best in Alberta
Perhaps most encouraging was the second monthly acceleration of wages, which outpaced inflation for the first time in six months. The Canadian dollar strengthened to 1.3391 to the United States dollar, or 74.68 USA cents, after the jobs data.
Professor Ravindra Gupta, a HIV biologist from University College London, pointed out the difference between someone being "functionally cured" and "cured".
HIV and AIDS have had a crippling impact across the globe since it first appeared in the 1980s.
He added: "Although the finding is exciting, it is not offering up a new treatment for the millions of people around the world living with HIV".
This week's finding also creates more research possibilities and will hopefully stimulate a return to more research for a cure and away from the current narrow scope of research that nearly exclusively focuses on the development of more effective and more powerful yet similar HIV cocktail drugs. In 2013, for example, Rewire.News reported on the cases of two men in Boston who had Hodgkin lymphoma and received bone marrow transplants from donors with the mutation. After receiving treatment, both patients were eventually taken off their anti-retroviral medications and subsequent examination showed that that even with very sensitive blood tests, the team could not detect HIV in their blood. Scientists have always been trying to replicate results from the Berlin patient (first man cured of HIV/AIDS) and, with the London patient (second man cured of HIV/AIDS), they seem to have succeeded. At the moment, the procedure still carries too much risk to be used in patients who are otherwise well, as daily tablet treatment for HIV is able to maintain patient's long-term health'.
Since then, no one has ever managed to eliminate the HIV virus until very recently: a few days ago, researchers announced that another patient, this time in London, also managed to get rid of the virus, also following a stem cell transplant meant to treat a different condition. His new immune system also appears to be functioning well.
The procedure is expensive, complex and risky, and will not be a common method to cure all patients with HIV, the report said.
ViiV, an offshoot of GlaxoSmithKline and Pfizer, is also looking into whether the injection can prevent HIV transmission.