Former US president Jimmy Carter says recent liver surgery revealed that he has cancer that has spread to other parts of his body.
"Recent liver surgery revealed that I have cancer that now is in other parts of my body," Carter said in a statement released by the Carter Center on Wednesday.
"I will be rearranging my schedule as necessary so I can undergo treatment by physicians at Emory Healthcare," he added.
The 90-year-old statesman, who travels around the world to support humanitarian causes, underwent surgery to remove a small mass in his liver on August 3.
The Carter statement revealed that the cancer is widely spread but not where it originated, but it said more information will be released when more facts are known, "possibly next week."
Following Carter's announcement, President Barack Obama expressed his good wishes, saying he and his wife Michelle Obama wish Carter a fast and full recovery.
"Jimmy, you're as resilient as they come, and along with the rest of America, we are rooting for you," Obama said in a statement released on Wednesday.

Meanwhile, Bernice King, daughter of Martin Luther King Jr., posted a message on her Twitter page: "President #JimmyCarter is in my thoughts & prayers. May the Lord heal, comfort & encourage this extraordinary servant-leader to the world."
Carter, a Democrat from Georgia, was the 39th president of the United States. He was in office from 1977 to 1981.
A year after leaving the White House, he founded the Carter Center in Atlanta to promote healthcare, democracy and other issues.
Carter was awarded the Nobel Peace prize in 2002 for his commitment to finding peaceful solutions to international conflicts and his work for human rights and the promotion of democracy.
Carter is a member of The Elders group of retired prominent world figures "working together for peace and human rights". He published his latest book last month, titled "A Full Life: Reflections at Ninety."
Carter has also emerged in recent years as an outspoken critic of Israel for its oppression and brutality against the Palestinian people.

In his book Palestine: Peace Not Apartheid, published in November 2006, Carter states that Israel's continued control and colonization of Palestinian lands have been the primary obstacles to a comprehensive peace agreement.
He declared that Israel's current policies in the occupied Palestinian territories constitute "a system of apartheid, with two peoples occupying the same land, but completely separated from each other, with Israelis totally dominant and suppressing violence by depriving Palestinians of their basic human rights."