Chemo is a very personal decision for you and your ferret. The sooner it is started the better the odds that it will help however if she was diagnosed in Feburary you will likely need to do multiple tests to stage her lymphoma and decide how progressive it is.
Pred can be used when you opt out of chemo to help keep her comfortable. However, if pred has already been used or is being used it can decrease the benefits of the chemo (pred conditions cells to kick chemo out of the tumor cells and therefore the chemo is less effective).
In addition, one of the more effective chemo agents in the ferret lymphoma protocol, L-spar, is becoming increasingly difficult to obtain. There are other protocols and modified protocols that can be used.
As I mentioned above, if you go down the road of chemo you will likely need to start with tests to stage her lymphoma to determine how far it has spread and if she is a candidate for chemo or not. It is also important to keep all of your appointments for drug administration and rechecks and bloodwork. This helps to ensure that the infection fighting cells (white blood cells) are not dropping too low and that she is responding to the treatment. These appointments can get very expensive throughout the course of treatment so you need to be prepared for that. As UncleJoe mentioned, chemo is given in cycles to allow the body time to rebound in-between.
Overall chemo for animals tends to not have quite the severe side effects that it has in humans but it will still have side effects. It is difficult to say if it will work for any particular animal. If it does work, it is difficult to say how long it might keep the cancer at bay.
Good luck with your decision.
<message edited by lnsybean44 on Wednesday, August 13, 2014 12:26 PM>