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I am a little nervous about treating something without proof of looking at the cells. An aspirate will give a diagnosis about 25% of the time, but a biopsy would give a diagnosis nearly 100% of the time even though it is more invasive. There is minimal risk about spreading the cancer with an aspirate technique, and if it is cancer, then you will be treating with chemotherapy anyway. So any cells that are seeded from the aspirate or incision for biopsy will be treated by chemotherapy. These are seldom treated by surgery.
Peroxicam is a good choice for treatment and it is commonly used for bladder cancer. Palladia is not approved for this treatment. It is used for treatment of mast cell tumors. Chemotherapy with chlorambucil can achieve remission in 3% of cases.
Does that help to answer your question?
The feldene will work great for her hips, just as well as rimadyl. You would not want to use both medications together. Only the feldene works with bladder cancer treatment however. Rimadyl has not been shown to help with that.
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It will not hurt anything to test this theory. The worst case scenario would be that her incontinence returns. You could start up the Proin at that time if it should come back. I can not think of a reason why the feldene would cause her not to want to take the Proin tablets, but it is possible.