We're onto you this time, leukemia. A new cancer treatment that uses the patient's immune system has been found to destroy leukemia in 88 percent of adults, according to a new report. Out of 16 patients inovlved in the study, 14 went into compete remission after scientists genetically engineered their T cells to aim to destroy cancer. "This is a real phenomenon," said Renier Brentjens, director of cellular therapeutics at Memorial Sloan Kettering Cancer Center. "This could be a paradigm shift in the way we approach cancer therapy."