SIOUX FALLS, S.D. — South Dakota U.S. Sen. Mike Rounds says his wife is resting at home after undergoing successful cancer surgery.

Rounds says the couple returned home to Fort Pierre on Wednesday after Jean Rounds underwent surgery at Mayo Clinic in Rochester, Minnesota. Rounds says his wife will now heal before undergoing five weeks of radiation treatment.

The Argus Leader reports Rounds said Thursday the "big part" of the cancer treatment is now done, and the couple is thankful about how it turned out.

Sen. Rounds says the family wants to say thanks for all the prayers and support they've received across South Dakota.

Jean Rounds was diagnosed in June with a malignant tumor near her sciatic nerve. She completed chemotherapy earlier this month.

The Republican senator is up for re-election in 2020.