Melanie,
I am NOT a physician!
I'm a man who had early-stage PCa in 2001 at age 65 and chose to have surgery performed at Johns Hopkins in Baltimore by Dr. Alan Partin.
I'm very happy with my choice.
Radiation would have caused great difficulty for me because I had a "very low-calibre urine stream" before my diagnosis.
For men who don't have a problem urinating, radiation is often greatly preferable to surgery performed by a typical "pretty good" urological surgeon. A prostatectomy is a tricky operation, usually not done well. Brachytherapy is a good treatment for early-stage PCa. CTCA is a reputable institution that has cured many men. Their brachytherapy is usually HDR, high-dose temporary seeds, plus XRT, external radiation therapy.
One branch of CTCA is located in Tulsa, Oklahoma. Where are you? (I'm in Stillwater, OK.)
Unless your father is able and willing to seek out a top-notch urological surgeon, I recommend against surgery.
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Good luck and best wishes!
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John C.