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MIAMI (CBSMiami/CNN) — Former Republican presidential nominee Mitt Romney was treated for prostate cancer, sources close to Romney said Monday.

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The sources say he was treated over the summer.

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“He was treated surgically by Dr. Thomas Ahlering at UC Irvine Hospital in California,” the source told CNN. “His prognosis is good; he was successfully treated.”

The source did not provide additional details.

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Romney, the 70-year-old former governor of Massachusetts, is being widely encouraged to run for Utah Sen. Orrin Hatch’s seat in 2018.