I did it once and realized after I had put him thru it, I was better off not to have done it. The chemo was very hard on him, and it only extended his life by a few weeks. I felt it was not worth the hardship that I put him thru to keep him in my world for that short time. I did it more for me than for him.
If given the option again, I would do it, but only if it would truly add to the quality of their life, not detract from it. I would spend a lot more time researching the prognosis to see if it was worth putting them thru it.
I watched my mom, dad and father-in-law all pass from cancer, and do not wish that suffering on any of my babies.
Now, when any of my babies become terminally ill and I am making that dreaded decision, I ask myself: am I doing this for them or for me? An honest answer will guide you in the right direction.