I believe it is.
Some stop responding and they run out of TKI options. Some experience side effects severe enough to stop a particular TKI and does not respond to others.
And the accumulation of something so toxic into our bodies poses its own dangers. This is why I use the sauna on a regular basis - and I encourage those without contra-indications to explore the subject.
This is why I suspect TKI pairing or TKI cycling should be given serious thought.
SCT is not without it's potential dangers. The GVHD (graft vs host disease) sounds terrifying and my limited research indicates cataracts is a very real possibilty for those who undergo the procedure.