



Although not a great result, you now have answers and can start thinking about treatments.
Recent research (2015) shows about 25% of diabetic cats have acromegaly and not all of them are higher doses. I've seen suggestions that if a cat is still unregulated after six months, the acro testing should be done. Did by any chance the vet ask for IAA (insulin auto antibody) testing at MSU too? It's a non uncommon second condition kitties can have, Neko had both.
Our acro kitties are still very loveable and with help can still live a good life for several years. The first thing I would do is talk to your vet about cabergoline treatment. There are other options (stereostatic radiation therapy which Neko had) and pituitary removal surgery but they are quite expensive in comparison and involve travel. New York is the closest place to you that does the surgery, not sure about the SRT. Cabergoline is a medication that most people get compounded into liquid and give daily. You might want to look at the copy of the paper attached to this thread, and possibly pass it onto your vet:
New paper on: Cabergoline treatment in cats with diabetes mellitus and hypersomatotropism
We have several kitties here on cabergoline now. It usually reduces the amount of insulin needed and helps with any acro side effects too. We've had 4-5 cats actually go into remission on it. Cats with smaller tumours tend to do better. With Theo's relatively small insulin dose, that could be in his favour.
Acromegaly is caused by a benign pituitary tumour and side effects are caused by it putting out excess growth hormone that it turn causes excess IGF-1 to be output. Results of excess growth hormone include growth in soft tissue, bony structures and organs. Side effects can include proteinuria as a not uncommon acro symptom. Do keep a close eye on how his kidneys are doing. Symptoms often include changes in breathing sounds, some cats snore more. Neko did not have those. She did have soft tissue growth in her gums and tear duct being blocked, she also had quite bad arthritis from the bony growths.
You probably have a million questions, I know I did at this point. Let us know how we can help.