My cat has cancer...need feedback/opinions

Our 13 year old female cat was just discovered to have a tumor (an adenocarcinoma) in her abdomen...believed to be attached to her small intestine. We took her in to the vet after she wasnâ€[emoji]8482[/emoji]t eating for a few days. We did a biopsy and blood work. While no sign of cancer was found in her blood work, the vet is 99% sure the tumor is cancerous but doesn't know if its spread. In the mean time weâ€[emoji]8482[/emoji]ve been giving her 2 mLâ€[emoji]8482[/emoji]s of prednisone daily to help with the inflammation and it seems to be helping. We also gave her a shot of antibiotics. Sheâ€[emoji]8482[/emoji]s eating and acting quite normal.
Our primary vet told us that if we chose to have surgery, the life expectancy of our cat would still average 3 – 6 months after surgery. Though she said some cases have shown that cats have lived longer…up to 18 months. Of course, cases have shown that some cats her age donâ€[emoji]8482[/emoji]t survive surgery or donâ€[emoji]8482[/emoji]t live within a week of surgery.
Another vet suggested we remove the tumor, which is about the size of my fist, and proceed with chemo. He stated that typically cats do “quite well†with the surgery and are usually back home in about 2 days and up on their feet again in about a week. My family and I already know we wouldn't want to put our cat through the chemotherapy…we have family members whoâ€[emoji]8482[/emoji]ve been through it and to put a pet through it isnâ€[emoji]8482[/emoji]t something weâ€[emoji]8482[/emoji]d want. But we're really unsure if we still want to get the tumor surgically removed to make her more comfortable and possibly give her a good chance to live longer. Would putting her through the pain/recovery time of surgery be practical? And would doing surgery and then not doing chemo be practical?
If anyone out there has been in similar situation Iâ€[emoji]8482[/emoji]d love some help/feedback on this.

We recently lost our 12 yr old cat to breast cancer.
She had three surgeries for tumor removal in the past three years. The tumors would return about 6 months after surgery. We did not have any other treatments.
Her tumors were pretty small-peas sized but after the third one returning in about the smal area the vets warned up about possible nerve damage and loss of use of one of her legs due to tissue removal.
Have you had a lung xray? Bobber's metasized to her lungs about 6 months after her final surgery and she lived about 10 months after that xray.
Bobs recovered well after surgery but hated all the vet checks and the antibiotics.
Its a tough call to make. Hope this info helped.

Thanks for your reply GailC, and sorry for your loss. We haven't had a lung scan done. I think our first call to make is this surgery...whether we are going to go through with it or not. If we do and the tumor comes out, the docs will know exactly what it is and how to proceed. It is a tough call...

I'm so sorry you're going through this. I would suggest you talk to the vet regarding the difference in reactions to chemo between humans and cats. Apparently cats can tolerate chemo far better than humans. It's just something I would ask about before ruling it out altogether.