DISEASE CHARACTERISTICS: Histologically confirmed advanced non-small cell lung cancer that is progressive within 2 months prior to study entry Stage IIIB due to malignant pleural effusion or supraclavicular lymph node involvement only Stage IV At least 1 bidimensionally or unidimensionally measurable target lesion Brain metastases or leptomeningeal disease that have been treated with radiotherapy, is stable without medications (e.g., steroids), and asymptomatic are allowed