Chemotherapy, Tirapazamine, and Radiation Therapy in Treating Patients With Non-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. Tirapazamine may make the tumor cells more sensitive to radiation therapy. Combining chemotherapy, radiation therapy, and tirapazamine may kill more tumor cells. PURPOSE: Phase I trial to study the effectiveness of combining chemotherapy with tirapazamine and radiation therapy in treating patients who have stage II or stage III non-small cell lung cancer.