Cancer Treatment for 6 Year Old Cat

I have had this cat since she was a 2 week year old kitten. I had to bottle feed her and spent many sleepless nights making sure she was getting the proper care since she technically was supposed to be with her mother still. I found her outside alone abandoned. She is now 6 years old and couldn’t imagine life without her. She recently was hospitalized for a tumor that ruptured and after a biopsy, it was determined she has cancer. I was able to do payments plans and insurance will help with some but I will be really struggling for future treatments. Anything helps.