http://www.nytimes.com/2012/12/10/health/a-breakthrough-against-leukemia-using-altered-t-cells.html 2014-10-06 09:14:54 A Breakthrough Against Leukemia Using Altered T-Cells Emma Whitehead, 7, has been in full remission for months after scientists used a disabled form of H.I.V. to reprogram her immune system to kill cancer cells. ===