Hello- Having multifocal adenocarcinoma of the lung in both lungs, I am considered a stage 4 lung cancer. However I do not always have an active cancer. Sometimes all my little nodules are very indolent or not active at all. That is considered stable. When I had my first lobectomy on my lower right lobe I was cancer free for 10 years. I was the big NED! I thought that I was cured. He “got it all out” End of story. But 10 years later I not only had cancer but it was comprised of 3 tumors. They were all considered primary adenocarcinomas – they had a different cell make up and size. What! That’s when my life changed to unstable. I went from NED to Chronic.
Here is an excellent article about advanced lung cancers: