Last Sept or thereabouts I received some radiotherapy to halt any further breast enlargement. It seems to have worked so far. Very easy to tolerate, there were only 3 sessions not counting the simulation they used to develop a fixture. This was using electron beam, so not the usual photon beams. Because of that the depth of penetration was very shallow so no worries about secondary SEs.

What I had was very mild enlargement, just noticeable enough for my MO to agree that there was some gynocomastia. He explained the two main options, one taking a hormone pill, the other radiation.

I figure if when I get off the ADT in about a year if the tissue that had developed there bothers me I can always get surgery. That would be out of my own pocket though. I'm guessing less than $5k since only local anethesia is used.