Nonsynonymous mutations in the MET gene have been described in non-small cell lung cancer (NSCLC) and (small cell lung cancer) SCLC. Increased expression of MET protein was associated with improved progression free survival and overall survival in patients who received MetMAb (an anti-MET antibody) and erlotinib. The activity of MET inhibitors in NSCLC or SCLC tumors with non-kinase domain MET mutations is not yet known.