Understanding the cancer drug that helped former President Jimmy Carter

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ST. LOUIS (KTVI) - Former President Jimmy Carter announced Sunday that his latest brain scan showed no signs of cancer. This past summer, the 91-year-old revealed that melanoma had spread from his liver to his brain, causing four small lesions.

Dr. Ryan Fields of the Siteman Cancer Center visits Fox 2 News in the Morning to discuss the new drug Mr. Cater is taking – Keytruda.