How very frustrating that the injection seemed to work on the diarrhoea and then stopped. Does he cope okay with getting the Pancrenzyme? Does your vet think there is any link between the diarrhoea and the tumors? I remember my vet telling me about the toxic wastes that tumors throw out that make both humans and cats sick in uncomfortable ways. I think T&PM could be right about it not bothering Lucas as much as you, the way he poops, or does he look distressed?

It's good that your vet was very clear about the way she feels on chemotherapy for Lucas. I trust my vets pretty well and when they both say (one's a pessimist and the other is an optimist) they wouldn't suggest it, then the case is closed.