CBS Evening News | An experimental gene therapy treatment has shown promise in the fight against leukemia, and doctors will soon start using the sophisticated immunotherapy in patients with non-Hodgkin's lymphoma

An experimental gene therapy treatment has shown promise in the fight against leukemia, and doctors will soon start using the sophisticated immunotherapy in patients with non-Hodgkin's lymphoma. Dr. Jon LaPook spoke with one patient who is cancer free after living with the disease for 14 years. Air Date: Dec 9, 2013