Oh No! So many bad news!My kitty has cancer
The vet called back with the bloodwork results from her vet visit. Her liver numbers are sky high. The vet suspects lymphoma. She said we could either try an aggressive treatment tactic, or try steroids until it's time for her to go.
She's 21, so aggressive treatment like surgery or chemo isn't fair to her. So we're just gonna do steroids to see if that helps her, and then when she's not doing well any more, we'll put her to sleep.
21 is a good long life for a cat, though. Doesn't mean I'm not sad about it, of course.

I wouldn't go forward with an aggressive cancer treatment for a 21 year old cat. As sad as it is, but 21 years is a long life for a cat.