I am very sorry to hear about your beloved pet going through so much. Before I give you information on Fibrocarcinoma, I would like you to think about a few things first. This is an invasive cancer and radiation treatment will be a followup. Do you want to put your cat through that? Would you rather work closely with your vet and be sure your cat is comfortable and any pain is rectified while you have quality of time with your dear cat? I had a 10 year Cairn named Daisy. She had Cushing's Disease (a form of cancer.) Of course the vet immediately wanted to put her on a form of radiation and chemo. We asked our vet many questions and then my husband and I came home to think things over. It wasn't a matter of money, but the quality of what life our dear little girl had. The day we went in to see the vet and tell her our decision a lady came in with a terrier and was complaining her pet was very ill on the medications and treatment. The dog did not look well at all. We told the vet we would work closely with her re managing any pain (there was none) but we decided to slow our own pace of life down and just enjoy what time we had with our dear Daisy. That we did. We had a blast together and to look at her you'd never know she was ill. We had over a year with her and we've never looked back with any regrets at all. I am not trying to push you into this direction, but just giving you something to think about. The treatment following your cat's surgery is not pleasant and you should really talk this out with your vets. Here is the information re Fibrocarcinoma: Fibrosarcomas of the mandible are tumors with a high rate for local invasion and destruction of tissue. (Mandibular fibrsarcomas) also tend to metastasize. If your pet is not old then an aggressive approach to therapy such as mandibulectomy and even adjuvant therapy with radiation and/or chemotherapy. Wide surgical excision is required to reduce risk of recurrence. If the pet is older then surgery of this nature may compromise her further without necessarily providing any benefits of increasing survival time (primarily because of the possibility of occult metastasis). Radiation therapy alone has provided a palliative approach for fibrosarcoma in dogs who are not candidates for surgery and in some cases remission of the disease. Radiation therapy alone has provided an average of about one year in terms of survival compared to no treatment. Surgery combined with radiation has provided longer survival times in some cases. Results of any therapy, however, will depend on whether or not metastasis has already occurred (which may or may not be detectable at this time). NOTE: Radiation/Chemotherapy therapy is the same for animals as in humans and it's not pleasant. This is something to discuss with your vet. A quality of time with your pet and not the effects of Radiation/Chemotherapy, or aggressive treatment that will leave your pet quite ill and no guarantee your pet will have added months or years by receiving such treatment.