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If this is a transitional cell carcinoma and it is big enough for your vet to palpate then it is in an advanced stage. If it is this large it is not likely treatable surgically. Piroxicam is the best medication, but it is variable in it's effectiveness. It should help shrink the tumor some, but will not cure it. Average survival after diagnosis is 6 months, however it can be much more or much less. I would give her a 70% chance of getting better on the piroxicam. It will give her some quality of life, but not a cure.
I hope that answers your question, but if you have more questions please let me know.
You can have bleeding with TCC. Usually the bleeding is mostly when they urinate or when they strain to urinatate.