I am so sorry to hear that it isnt' good news - it is one of those situations where you want to be proved wrong. I totally understand and agree with your decision, there would have to be a very very good chance of a lot of good quality time for me to put a cat through chemo, especially an elderly one, as they simply don't know why they will feel bad, nor can they tell us truly how bad they are feeling, so I would do the same, and cherish the time I had, even if it is shorter.