 - Arm I: Patients receive pemetrexed disodium IV over 10 minutes followed by carboplatin IV over 30 minutes on days 1, 22, 43, and 64. Patients also undergo thoracic radiotherapy once daily on days 1-5, 8-12, 15-19, 22-26, 29-33, 36-40, and 43-47. 