Cisplatin and Docetaxel With or Without Radiation Therapy in Treating Patients Who Are Undergoing Surgery for Newly Diagnosed Stage III Non-Small Cell Lung Cancer

RATIONALE: Drugs used in chemotherapy, such as cisplatin and docetaxel, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Radiation therapy uses high-energy x-rays to kill tumor cells. Cisplatin and docetaxel may make tumor cells more sensitive to radiation therapy. Giving more than one drug (combination chemotherapy) together with radiation therapy before surgery may shrink the tumor so it can be removed. Giving chemotherapy after surgery may kill any tumor cells that remain after surgery. It is not yet known whether giving cisplatin and docetaxel together with radiation therapy is more effective than giving cisplatin together with docetaxel in treating non-small cell lung cancer. PURPOSE: This randomized phase III trial is studying cisplatin, docetaxel, and radiation therapy to see how well they work compared to cisplatin and docetaxel in treating patients who are undergoing surgery for newly diagnosed stage III non-small cell lung cancer.