Congratulations on making the decision. I know all the work you did that went into it, and you should feel really good about
that.
To my knowledge, chemo has never been used with brachy boost therapy. The results are too good without it. I don't really understand why you would even consider it outside of a clinical trial, since there is no evidence to support such a thing.
Optimum timing for adjuvant hormone therapy after brachy boost is very much a judgment call. Most seem to use 6 months or a year. Demanes believed that adjuvant ADT conferred no additional advantage when used with HDR-BT (see link below), and the study with the lowest utilization of adjuvant ADT in high-risk patients (Zamboglou et al., at 60 percent) actually had the best oncological outcomes (see below).
Similarly, Alan Katz found that adjuvant ADT did not improve outcomes among high-risk patients treated with SBRT (which also has a high biologically effective dose), and Chris King makes 9 months of ADT optional in his SBRT high-risk protocol. It’s possible that there is an as yet undiscovered quality about
extreme hypofractionation that obviates the need for adjuvant ADT, or it may just be the higher biologically effective dose. Men to be treated with LDR-BT are sometimes given a longer duration of ADT pre-treatment in order to shrink their prostates — we do know that seeds are more effective on smaller prostates.
Until we have data from a randomized clinical trial, adjuvant ADT duration is a matter of judgment.
Excellent Results From High Dose Rate Brachytherapy and External Beam for Prostate Cancer are Not Improved by Androgen Deprivation/pcnrv.blogspot.com/2016/08/hdr-brachy-boost-and-monotherapy-for.html