 After you complete 6 treatment cycles of cisplatin and pemetrexed, you will continue to take imatinib mesylate tablets every day up to 1 month after the 6 treatment cycles. If you develop any intolerable side effects or if your disease gets worse, your treatment on this study may be delayed; the dose of the study drugs decreased until your side effects are gone; or you may be taken completely off this study. Your doctor will talk with you about any changes in your dosing schedule or in the doses of your medication after you been evaluated in the clinic. 