Hi Rebecca,
I am so sorry about your loved one and this awful cancer. To answer your question ascities is never a good sign, even if they test the fluid for cells and there are none it doesn't mean the cancer has not spread. Most cause for ascities is bc cancer has spread to the lining of the abdomen and it irritates it causing the fluid build up. The important thing to remember is is can be dangerous, it can build up to the point where it can affect his heart and it must be continually aspirated. It also can affect his appetite causing a false sense of fullness, my Dad never had irtotnib, I don't know what that is, hoping it will help.