I have now been stage IV for almost three years (Sep. 2011). I have read many posts here that have helped me through some tough times, hopefully my news will help some of you.
I started PD-1 (nivo) in December. I just had my final scans and, thankfully, I responded. The target met (right lung) shrunk from 4.6 sq. cm to 0.42 sq. cm (90%) and the smaller met (left lung) is gone.
Furthermore, today I had my brain MRI and my brain is clear. I had craniotomy #2 one year ago today (June 25) and my brain has been clear since.
Good luck to you.
I also posted this on MIF.