(Reuters) - Former U.S. President Jimmy Carter said on Sunday that he will no longer need treatment for melanoma, a type of skin cancer that had spread to his liver and brain, the Atlanta Journal-Constitution newspaper reported.

The 91-year-old Nobel Peace Prize winner will continue to be observed by doctors, but will not need treatment with a promising immunotherapy drug that helps the body's immune system target cancer cells, the newspaper said, quoting his nonprofit public policy center, the Carter Center.