DISEASE CHARACTERISTICS: Histologically confirmed stage IIIB with metastatic pleural effusion or metastatic stage IV non-small cell lung cancer Large cell Adenocarcinoma Squamous cell Bronchioalveolar carcinoma Undifferentiated No small cell or carcinoid histologies At least 1 bidimensionally measurable or evaluable indicator lesion Measurable or evaluable indicator lesion(s) must be completely outside the radiation portal or there must be proof of disease progression No current CNS metastases at study entry No meningeal carcinomatosis

PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Zubrod 0-2 Life expectancy: Greater than 12 weeks Hematopoietic: Neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than upper limit of normal (ULN) SGOT and/or SGPT no greater than 2.5 times ULN if alkaline phosphatase less than ULN, OR alkaline phosphatase no greater than 4 times ULN if SGOT and/or SGPT less than ULN Renal: Creatinine clearance at least 50 mL/min Other: No concurrent illness that would effect assessment of this study Not pregnant or nursing Effective contraception required of all fertile patients

PRIOR CONCURRENT THERAPY: Biologic therapy: Not specified Chemotherapy: No prior systemic chemotherapy No other concurrent chemotherapy Endocrine therapy: Not specified Radiotherapy: See Disease Characteristics Prior radiotherapy for non-small cell lung cancer allowed Radiotherapy for new brain metastases (other than leptomeningeal disease) is allowed during study, but chemotherapy is stopped during and for 2 weeks following radiotherapy Concurrent radiotherapy to other sites allowed if there is no objective criteria for disease progression Surgery: Not specified Other: No other concurrent experimental drug