Hi Perry and welcome,
Yes, a Gleason 4+3 needs treatment, unfortunately. I think it's a good idea to get a second opinion on those 4 biopsy cores from Epstein's lab at Johns Hopkins, just to make sure.
SBRT, brachytherapy and surgery are all curative options for you. With low dose rate brachytherapy (seeds) they would probably want to add external beam radiation with that. With high dose rate brachytherapy (temporary implants) they may or may not add external beam. In general, monotherapies have lower rates of side effects.
Why would you get in trouble for talking about
a clinical trial? They usually want to publicize it. If you want to know more about
SIB, you may be interested in this:
Dose Painting: simultaneous integrated boost (SIB) to the dominant intraprostatic lesion (DIL)I had SBRT myself, so if you have any questions, please just ask.
(BTW - how strange that the doctor asked you how many cores. If you had a nerve block it wouldn't matter, and imho, they should always take random cores from other areas as well as targeted cores)