Conventional chemotherapy will be selected at discretion of the treating physicians except on those cases in which pathologic diagnosis indicates non squamous NSCLC. Those patients will be treated with pemetrexed. Patients will receive a total of 4 cycles of adjuvant chemotherapy (each cycle given every 21 days). Pegfilgrastim, a granulocyte-colony stimulating factor (G-CSF), will be allowed on day 2 at discretion of the clinician.