get into human immune systems to change those cells to target cancer fighters. they went back in and destroyed the cancer. dr. steven gruff is a pioneer. using hiv to infiltrate the hiv system. all of the things that make the hiv virus to cause disease have been removed from this particular virus, so its only purpose is to put a gene into a cell. for me, it s incredibly exciting. reporter: here s emma, just eight months later. doctors can t find any remaining cancer cells. she is in complete remission. she has no leukemia in her body, by even the most sensitive tests. she has a ton of energy. she s doing wonderful right now. this treatment was a miracle. reporter: emma is counting the days until christmas. her parents are busy counting their blessings. the treatment does wipe out part of the immune system, so she has to receive medicine once a week, to prevent infection. but she s feeling strong and
Detailed text transcripts for TV channel - KGO - 20121211:11:14:15
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Detailed text transcripts for TV channel - KGO - 20121211:10:44:15
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