@paul28 It's my first time hearing about the use of radiation within the prostate ported to various locations with tubes. Googling, I see a few descriptions including this one on the Mayo Clinic site https://www.mayoclinic.org/tests-procedures/prostate-brachytherapy/about/pac-20384949
Given your complicated history, I can see why this approach might be particularly attractive for your treatment plan. Here's hoping for meaningful outcomes!
So traditional brachytherapy is now LDR (low dose radiation, I think) and this approach, apparently also used with some other cancers, is HDR (high dose radiation, but maybe we should add VT--very temporary?!) What an interesting approach to ablation--killing the cancer in place.