Gefitinib and Celecoxib in Treating Patients With Refractory Non-Small Cell Lung Cancer

RATIONALE: Gefitinib may stop the growth of tumor cells by blocking the enzymes necessary for tumor cell growth. Celecoxib may slow the growth of cancer by stopping blood flow to the tumor. Combining gefitinib with celecoxib may kill more tumor cells. PURPOSE: Phase II trial to study the effectiveness of combining gefitinib with celecoxib in treating patients who have non-small cell lung cancer that is refractory to platinum-based chemotherapy (such as cisplatin or carboplatin).