@tango32652
BAT is where you give people testosterone in order to try to reverse their becoming Resistant to ARPI drugs. When that happens, the PSA starts rising, even though they are on the drugs. In some cases, giving injections of testosterone for a few months can allow people to be able to use the ARPI drugs again. (Zytiga and the lutamides)

Here’s some further information though they claim this is new. This procedure has been around for a few decades.. I was offered it maybe five or six years ago as an option.
https://pmc.ncbi.nlm.nih.gov/articles/PMC9313844/
Here is a link to a magazine that discusses BAT as well as a number of other issues prostate cancer patient would be quite interested in. First brought up by @vancouverislandhiker
https://online.flippingbook.com/view/150884930/