I can imagine how devastating this news must be to you, it's happened to me several times and it never gets easier.

While the news is bad, is it truly immediately hopeless? I ask because I had a cat, Simka, who stopped eating and became nauseous, and was diagnosed with both liver cancer (the results from her aspirate said it was a very aggresive type of cancer, but that must have been wrong) and chronic renal failure. I thought I would lose her very quickly and it was hopeless. However, like Nipo, Simka was still full of life and so, with the vet's approval, I decided to try treating her for a while. She was on anti-nausea medication and I force fed her for two weeks. After a few days, she kept most of her meals down and became stronger. I treated the CRT with daily sub-q fluids. After two weeks, she began eating by herself though it was always difficult to find out what she wanted to eat each day. She remained on the anti-nausea medications and I offered her a wide range of foods, both wet and dry, cat and human, each morning and evening. She lived for 2 years and 3 months past that terrible diagnosis. Good years, playing with her toys, demanding attention, lolling around in the sun on the deck. The mass did become larger and larger, but apart from making it harder for her to get up on the bed, didn't seem to bother her. When it did bother her, she was euthanized.

It was a great deal of work to take care of her. But when I remember how much she loved walking around talking to her felt mice, laying them in turn in front of the heat vent until there were three in a row when she would like down next to them, I'm very glad I was able to give her that time. I tucked three of the mice into the blanket I wrapped her in when I handed her body over for private cremation.

I've no desire to encourage you to prolong a life that has become painful and miserable, only to suggest you query your vet.