We had a cat that had cancer in his jaw or mouth, can't remember which. I think we started him out on I want to say metacam and then we switched to interferon. While it didn't stop the cancer, it did slow it's growth and give us more time with him. I strongly encourage you to utilize the internet to research the cats condition and what treatments are out there. What you find may help prolong your cats life. I will keep you and your cat in my prayers.
hi I'm so sorry to read about your kitty....I know very little about this but will send you to a site that has some reading on it perhaps that will help you.
I wish you both the very best of wishes I do hope something will help to keep your dear kitty with you as long as possible...♥
http://www.vetinfo.com/csqucell.html