@liz8716- Welcome to Mayo Connect Liz. It must have been devastating to receive the news about Keytruda. why was your Chemo stopped if your tumors shrunk? You are so young to hear this news, even if you smoked, it's young. How are you feeling on Keytruda?
I have a type of cancer that is does not respond well to chemo, although I did have it about 10 years ago. I have what is called, multifocal adenocarcinoma of the lung. I have several cancers at a time in one or both lung. I have had cancer since 1997, although that was a different NSCLC. The 10 years later the multifocal adenocarcinoma started up.
Have you tried any trials?