http://www.almotamar.net صحيفة إلكترونية يومية تصدر عن حزب المؤتمر الشعبي العام (اليمن) http://www.almotamar.net/691.htm 2006-09-03 Normal immune cells have become specialized tumor fighters after being genetically engineered, and for the first time, persist in the body and shrink large tumors in humans, scientists reported on Thursday.