Thirty-one patients with stage IB (> 4 cm), II or IIIA non-squamous NSCLC were enrolled, from which 24 were assigned treatment. The vinorelbine-sensitive tumors group received Vinorelbine 25 mg/m2 days 1 and 8, followed by cisplatin 75 mg/m2 day 1, every 21 days for 4 cycles. The pemetrexed-sensitive tumors group received pemetrexed 500 mg/m2 day 1 followed by cisplatin 75 mg/m2 day 1, every 21 days for 4 cycles. Standard pre-medication regimens included dexamethasone, vitamin B12 and folate supplementation in the pemetrexed group. Patients in both groups will receive up to a maximum of 4 cycles of therapy.