Tirapazamine Combined With Chemo and RT in Limited-Stage Small Cell Lung Cancer

This phase II trial is studying how well giving tirapazamine together with cisplatin, etoposide, and radiation therapy works in treating patients with limited-stage small cell lung cancer. Drugs used in chemotherapy, such as cisplatin and etoposide, work in 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 chemotherapy and radiation therapy. Combining chemotherapy and radiation therapy with tirapazamine may kill more tumor cells.