Worried,
I'm fairly new to the site and have only one additional comment to add to the other posts. Get your Dad to spend some time on this forum as soon as you can. It has been a tremendous help to me in choosing a treatment option and to understand the nature of PC, it's treatment options and side effects. It has helped me calm down and to manage my expectations. I encourage him (and you) to explore some of the other "strings" that are available. As the other guys (and a few gals) will all tell you, in the end nobody has "the answer". You and the family will have to do what you think is best after processing all this valuable informaton. And it does help to have a smart daughter....I have one of those too!
Best Wishes,
Joe67
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Age 67 - PSA - 4.3 Gleason - 3+3=6 Biopsy - positive in 5 of 8 sections. CT and Bone scans negative. Meeting with Urologist and Radiologist next week to schedule BT with corresponding Image Guided Radiation Treatment(IGRT)