Thanks so much for the replies.
I was apparently misinformed by a family member about the "two types of cells." He has stage 3 adenocarcinoma according to the oncologist. Today the oncologist recommended a six-week regimen of chemo (carboplatin and taxol) with radiation therapy. My father was originally told in the hospital that a "head-to-toe" PET scan would be performed. However, the oncologist only mentioned a MRI scan of the brain today. Should I ask for an explanation as to why the PET scan is not being scheduled?
I asked about targeted therapy and was told that it was limited to stage 4 at this point. In my reading I haven't found any contradiction to that assertion, though I have read that some phase III trials are being performed where immunotherapy is being explored for stage 3. I was wondering whether I should take my father for a second opinion on treatment. World-renowned Emory University Hospital is not too far away. However, based on my reading chemoradiation is fairly standard and the most aggressive approved treatment at this point. Hence, I don't know if it would be worth the effort. The surgery took a lot out of my father this weekend. I don't know that he would too enthused about a day trip in a car to another doctor that is likely to give the same answer.