Thanks for pointing out that article. I had googled on the topic and got a bunch of hits on medical papers, but none of them really addressed my question.
Carcinoid is an uncommon cancer that is famous for being very slow growing. I had a tumor in my lung removed in 1979 but around 1992 found it had spread before the removal - pretty much everywhere. HOWEVER, I've been living with it without effective treatment ever since then. (Radiation therapy...