AKIPRESS.COM - Former president of the U.S. James Carter said that the cancer, which doctors discovered earlier this year on his liver, has also been found on his brain.

Carter, 90, said he will receive his first radiation treatment for the disease Thursday afternoon. "I'm perfectly at ease with whatever comes," Carter said at a news conference.

Carter said Thursday that doctors found "four spots of melanoma on my brain -- small spots" after first discovering cancer during an Aug. 3 operation to remove a tumor from his liver.

During that surgery, Carter said, doctors suspected that the cancer had originated in another part of his body. They later discovered the melanoma spots, about "two millimeters" in size, on his brain.

Doctors removed about one-tenth of his liver during the surgery, which he said healed quickly and left him with "minimal pain."

He will undergo a single course of radiation treatment -- though more may be necessary, in the future -- and four treatments with an immune system-boosting drug, which will be administered at three-week intervals.

Carter, member of the Democratic Party, served as the 39th President of the United States from 1977 to 1981.