Vaccine Therapy in Patients With Stages IIIB/IV Non-Small Cell Lung Cancer Who Have Finished First-Line Chemotherapy

RATIONALE: Vaccines made from gene-modified tumor cells may help the body build an immune response to kill tumor cells. PURPOSE: This randomized phase I/II trial is studying the side effects of vaccine therapy and to see how well it works in treating patients with stage IIIB or stage IV non-small cell lung cancer who have finished first-line chemotherapy.