Secondary objectives are to assess the value of PET in predicting pathological response and eventfree survival in stage IIIA NSCLC, and a health economic analysis of the two regimens. Further to compare the amount of serum DNA in patients with stage IIIA, pN2 NSCLC before chemotherapy, before surgery and at the second follow-up visit (i.e. four months after surgery or treatment failure for patients who can not be operated) in patients randomized into the trial SAKK 16/00 and to correlate the DNA variation with tumor response, remission duration and overall survival.