This video is part of the Cancer Research Institute’s series “Immunotherapy: 5 Ways to Stop Cancer.” For more information on treating cancer with immunotherapy, visit http://www.cancerresearch.org. Adoptive cell therapy treats cancer by taking advantage of the immune system’s killer cells, the T cells. At its most basic, this involves removing cells from the patient, greatly enhancing their numbers, and then giving them back to the patient. Scientists can also alter the makeup of T cells in the lab to make them more powerful. This is known as CAR T cell therapy. While this type of treatment is not yet FDA approved, it is currently being studied in diseases like leukemia and early clinical trial results are very encouraging. This video is part of the Cancer Research Institute’s series “Immunotherapy: 5 Ways to Stop Cancer.” For more information on treating cancer with immunotherapy, visit http://www.cancerresearch.org.