Goodness, what a story and what a brave furkid and parents! FWIW, I would've done the same thing as you. I've had friends w/cancer who couldn't stand the harsh radiation and chemo treatments, so if I ever had to make that decision for any of my cats, I would follow the same course of treatment as you've chosen for Darby. Having had up to 8 cats at one time, the diseases have varied but we've been fortunate to not have experienced cancer, thankfully. Best wishes to you and Darby and please keep us posted on his progress. Oh, and welcome to Pet Talk.