The present invention relates to compositions comprising a combination of 10-propargyl-10-deazaaminopterin and an EGFR Kinase inhibitor, including erlotinib, for treatment of non-small cell lung cancer, and methods of treatment for non-small cell lung cancer in a patient in need thereof comprising administering for combination of 10-propargyl-10-deazaaminopterin and an EGFR Kinase inhibitor, including erlotinib, for treatment of non-small cell lung cancer.