I read your email with regret. I lost my cat to oral cancer the end of January, but I had had her for 19 years. Your cat is still so young, so that is especially hard to hear about. I guess I was lucky to have mine for so long, but geez, I miss her terribly. Life is not the same without her. I hope the prednisone will keep your kitty "well" for the next little bit until it's time to go. Love it and pamper it, though I am sure you will. Just be kind and don't let kitty linger on and be in pain. If I had known my cat had cancer I would have put her down much sooner (I thought she had an abcessed tooth that only needed pulling).
You are in my thoughts and keep strong through this sad time. KIitty will know it's been well loved and that is an important memory to keep.
Joyce