Gov. Jerry Brown's office says the California governor is undergoing radiation treatment for prostate cancer.

In an announcement Wednesday, his office said the 74-year-old is being treated for "localized prostate cancer."

University of California San Francisco oncologist Eric Small said in a statement released by the governor's office that the cancer was in its early stages.

He said it is being treated with a short course of conventional radiotherapy. He called the governor's prognosis excellent.