The purpose of this study is to find out what effects (good and/or bad) Pirfenidone combined with standard first-line chemotherapy will have on you and non-small cell lung cancer (NSCLC). The investigational drug Pirfenidone is being combined with standard chemotherapy in participants with advanced non-small cell lung cancer. Pirfenidone is approved to treat idiopathic pulmonary fibrosis (IPF) but it isn't currently approved to treat non-small cell lung cancer.