Is a cat cancer diagnosis a death sentence?

Definitely not. I have had many cats that we've cured of cancer and have gone on to live a quality life. Quality of life is hugely important in pets. We're not trying to extend the life of a cat that's going to be suffering. Quality of life's vital to this discussion. That, and, if we can get a good quality of life and extend it, that's just great if we can do both those things.