Chemotherapy Plus Radiation Therapy in Treating Patients With Limited-Stage Small Cell Lung Cancer

RATIONALE: Drugs used in chemotherapy use different ways to stop tumor cells from dividing so they stop growing or die. Radiation therapy uses high-energy x-rays to damage tumor cells. Combining more than one drug and giving them before and with radiation therapy may be an effective treatment for limited-stage small cell lung cancer. PURPOSE: Phase II trial to study the effectiveness of chemotherapy plus radiation therapy in treating patients who have limited-stage small cell lung cancer.