EXCLUSIVE: Former President Jimmy Carter says he's not cancer-free: 'I'm still taking treatments'

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EXCLUSIVE: Former President Jimmy Carter Reveals He Is Not Cancer-Free: 'Sometimes The Cancer Spots'

Jimmy Carter says his body is responding well to treatments, but the former U.S. President says he's not entirely free from cancer.

Speaking exclusively with ET's Brooke Anderson in Plains, Georgia, Carter opened up about the struggle he still faces.

"They haven't detected any cancer, but sometimes the cancer spots [return]," Carter said, "including in my brain."

READ MORE: Former President Jimmy Carter Adorably Caught on Kiss Cam With Wife Rosalyn

So while Carter is doing well in his fight against the illness, he's still "taking treatments regularly."

"I'll continue that until the doctors tell me I don't have to anymore," said the 91-year retired politician, adding, "My immune system seems to be responding positively."

See photos of the former president through the years:

19 PHOTOS
Jimmy Carter through the years
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EXCLUSIVE: Former President Jimmy Carter says he's not cancer-free: 'I'm still taking treatments'
Jimmy(James Earl) Carter as Ensign, USN, circa World War II. (Photo by PhotoQuest/Getty Images)
American politician and US Presidential candidate Jimmy Carter holds a handful of peanuts (referencing his career as a peanut farmer) during a campaign event, Boston, Massachusetts, 1976. (Photo by Mikki Ansin/Getty Images)
American politician and US Presidential candidate Jimmy Carter (center) smiles after his victory in the Pennsylvania Primary election, Philadelphia, Pennsylvania, April 27, 1976. Among those on stage with him are politicians Samuel L Evans (left) and Senator Birch Bayh (second left). (Photo by Mikki Ansin/Getty Images)
U.S. president Jimmy Carter smiling at a podium in front of an American flag, 1970s. (Photo by Hulton Archive/Getty Images)
1976: A campaign button supporting the Democratic politician Jimmy Carter for President. (Photo by MPI/Getty Images)
Jimmy Carter on his peanut farm, Plains, Georgia, 1976. (Photo by PhotoQuest/Getty Images)
Jimmy Carter (left) and Sen. Walter Mondale at the 1976 Democratic National Convention at Madison Square Garden. (Photo by James Garrett/NY Daily News Archive via Getty Images)
Photograph of President Jimmy Carter and First Lady Rosalynn Carter dancing at a White House Congressional Ball. Photographed by Marion S. Trikosko. Dated 1977. (Photo by: Universal History Archive/UIG via Getty Images)
Jimmy Carter of Plains, GA, was the 39th President of the United States and a big fan of NASCAR racing. In 1978, Carter invited a number of NASCAR Cup stars to the White House for a big dinner and entertainment provided by country star Willie Nelson. Nelson was there and so were First Lady Rosalynn Carter and the President'€™s brother Billy Carter, but President Carter was nowhere to be found. The President had gone to Camp David to meet with the leaders of Israel and Egypt, Menachem Begin and Anwar Sadat, in what ultimately would lead to a huge Middle East peace agreement known later as the Camp David Accords. (Photo by ISC Images & Archives via Getty Images)
Jean-Paul II In Washington, United States On October 06, 1979)-John-Paul II, Jimmy Carter and Rosalyn at the White House. (Photo by Pool JEAN-PAUL II AUX USA/Gamma-Rapho via Getty Images)
Photograph of President Jimmy Carter announcing new sanctions against Iran following the taking American hostages. Photographed by Marion S. Trikosko. Dated 1980. (Photo by: Universal History Archive/UIG via Getty Images)
Gerald Ford and Jimmy Carter during Humanitarian Awards Dinner - November 23, 1987 at Waldorf Astoria Hotel in New York City, New York, United States. (Photo by Ron Galella/WireImage)
Gillian Sorenson and Jimmy Carter during Benefit Dinner Dance for the Homeless - November 18, 1988 at Plaza Hotel in New York City, New York, United States. (Photo by Ron Galella/WireImage)
Musician Willie Nelson and former President Jimmy Carter at the taping of 'CMT Homecoming: Jimmy Carter in Plains,' which will premiere on CMT in December 2004. (Photo by Rick Diamond/WireImage)
ATLANTA - APRIL 22: Former President Jimmy Carter watches the game between the Philiadelphia Phillies and the Atlanta Braves at Turner Field on April 22, 2010 in Atlanta, Georgia. (Photo by Kevin C. Cox/Getty Images)
CAIRO, EGYPT - MAY 24: Former U.S. President Jimmy Carter addresses the media on the second day of Egypt's presidential election on May 24, 2012 in Cairo, Egypt. Carter Center election monitors observed the presidential election, the first of the post-Mubarak era. If no candidate wins an outright majority of the vote, the election would go to a second round June 16-17. (Photo by John Moore/Getty Images)
Former US President Jimmy Carter signs his new Book 'A Full Life: Reflections at Ninety' at Barnes & Noble on 5th avenue in New York on July 7, 2015. Photo by KENA BETANCUR/AFP/Getty Images
PASADENA, CA - JULY 30: President Jimmy Carter photographed at Vroman's Bookstore on July 30, 2015 in Pasadena, California. (Photo by Paul Redmond / Getty Images)
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Carter, who has been a huge inspiration for others battling cancer, opened up about the inspiration he's gotten from his wife, Rosalynn Carter.

"Her support has helped me the last 69 years that we've been married, in everything I've tried," Carter shared. "Of course when I was ill, they thought I might die any time, and she was there for me. She grieved with me and was excited with me when I found out that my metabolism responded well to the treatment."

SEE MORE: The Adorable Way Jimmy Carter Says 'I Love You' to His Wife of 69 Years

In December, Carter announced that his brain cancer was gone, and that an MRI showed no signs of cancer at all. It seems that the announcement may have been premature, but the former president shows no signs of backing down in his battle against cancer.

For more on Carter's long fight against brain cancer, watch the video below.

President Jimmy Carter Reveals Cancer Has Spread to His Brain
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