Jimmy Carter announced last August that his liver cancer had spread elsewhere in his body

President Jimmy Carter has ended cancer treatments just under a year after first announcing his diagnosis, he told the congregation of Maranatha Baptist Church in Plains, Georgia, on Sunday, according to NBC News.

“I didn’t need any more treatment, so I’m not going to have any more treatments,” he told the church over the weekend after a clean M.R.I. scan.

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The 91-year-old, who teaches Sunday School at Maranatha, said that he would still be monitored and “that if a cancer shows up again, I’ll start getting treatments again.”

Carter announced last August that melanoma was discovered when he underwent surgery to remove a small mass in his liver. At that point, the disease had spread to other parts of his body, including four "very small" spots in his brain.

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He underwent both chemotherapy and radiation treatment targeting the four, 2-millimeter melanomas.

Then, in December, the Nobel Peace Prize winner told his church that his latest scan revealed no signs of cancer.

“My most recent MRI brain scan did not reveal any signs of the original cancer spots nor any new ones,” Carter said in a statement to PEOPLE at the time. “I will continue to receive regular 3-week immunotherapy treatments of pembrolizumab.”