I'll just back up Jeff here by mentioning that I did choose to get my prostrate radiated (with a high so-called "curative" dose) despite the fact that the cancer had already escaped to my spine. I also had the spine itself radiated, after most of the metastasised tumour was removed there surgically.

In his prostate-cancer book, Dr. Walsh (using simple terms for laypeople like me) explains that there's a belief among some oncologists that individual dormant cancer cells and micro-tumours don't survive as well if they don't have a larger tumour to support them — a "mothership," as he calls it, or the perhaps a "Death Star" if you're a Star Wars fan.

I had both of my "motherships" effectively destroyed, and while it's likely there are still individual cancer cells in my blood and bones that are too small to detect, they've kindly obliged by staying dormant since 2021. That doesn't prove anything, of course (it might be just the Orgovyx and Erleada doing the work), but one oncology resident told me he thought that might be helping that I had the surgery and extra radiation to my spine.