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In a small trial, researchers have successfully used gene therapy to boost the immune system of 12 patients with HIV to resist infection. They removed the patients' white blood cells to edit a gene in them, then infused them back into the patients. Some of the patients who showed reduced viral loads were off HIV drugs completely.

In fact, one of the patients showed no detectable trace of HIV at all after therapy. The researchers, who report their phase I study in the New England Journal of Medicine believe theirs is the first published account of using gene editing in humans.

The team included researchers from the University of Pennsylvania (Penn), PA, Albert Einstein College of Medicine, Bronx, NY, and Sangamo BioSciences, Richmond, CA, the company that developed the gene editing technology.

Carl H. June, senior author of the study and professor at Penn's Perelman School of Medicine, says:

"This study shows that we can safely and effectively engineer an HIV patient's own T cells to mimic a naturally occurring resistance to the virus, infuse those engineered cells, have them persist in the body, and potentially keep viral loads at bay without the use of drugs."

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Gene therapy used to block HIV without drugs