Here's a brief video that explains my approach to a so-called "mixed response" to treatment for a lung cancer.  

[powerpress]

There isn't a formal teaching or "best answer" about how to approach this issue, but what I explain here is a common and I think very sensible strategy for a still controversial clinical setting (if I do say so myself).  I'd welcome your comments.

I hope you find it helpful if you or someone you care about faces this situation.