TULSA - An aide for US Senator Tom Coburn confirms the Oklahoma Republican has again begun treatment for prostate cancer.
The Senator has battled cancer several times.
The 65-year-old underwent surgery in Tulsa for prostate cancer in 2011.
He was diagnosed with a malignant melanoma in 1975, and also colon cancer in 2003, a year before he first ran for the Senate.
Coburn first ran for the U.S. House of Representatives in 1992, part of the "Republican Revolution" that claimed the majority in that body.
He stepped down after two terms, but returned to politics in 2004 with his successful bid for a Senate seat.
Coburn is one of three practicing physicians in the US Senate.
His spokesman says the Senator hopes to return to work as early as next week.