3-year-old boy cancer-free after using new treatment

Fox News senior medical analyst Dr. Marc Siegel discusses a 3-year-old boy who became cancer-free after using experimental CAR T-cell therapy.

Fox News senior medical analyst Dr. Marc Siegel discusses a 3-year-old boy cured of quick-spreading cancer using experimental CAR T-cell therapy. Siegel details how this new treatment reprograms immune cells to target cancer.