Former U.S. President Jimmy Carter is to undergo brain cancer treatment. He disclosed on Thursday, speaking that his cancer had spread to his brain and he will start radiation treatment later that day.

The nonagenarian spoke to the press on his health condition, a week prior he had announced he had undergone surgery for liver cancer. Appearing calm and lucid, the former president said he will cut back on his schedule to receive treatment after his doctors discovered the cancerous cells.

He noted: “I am perfectly at ease with whatever comes,” adding, “Now I feel this is in the hands of God.”

“I am ready for anything and looking forward to a new adventure,” Carter added. “I have had an exciting and venturous and gratifying existence […] I thought I had just a few weeks left but I remain hopeful,” he concluded.