Mary Luise, what do you mean by “biopsy test”? How was this done? Where is your dad being treated? If the doctor is recommending surgery, why are you concerned about doing that? Sorry for the questions, but it’s hard to give advice. My PET scan showed no cancer beyond the original lung node, yet I had a surgical biopsy of the lymph node in the center of my chest. It was negative and I had surgery a week later. Sounds like you already have a second opinion. Where did you get it? Many cancers are treatable now. Stay hopeful.