OBJECTIVES: I. Compare the duration of overall and disease-free survival in patients with completely resected non-small cell lung cancer (NSCLC) randomized to adjuvant chemotherapy with vinorelbine and cisplatin versus observation only. II. Confirm the prognostic significance of ras mutations when present in the primary tumor. III. Provide a comprehensive tumor bank linked to a clinical database for the further study of molecular markers in resected NSCLC. IV. Measure and compare the health-related quality of life of patients on both treatment arms. V. Evaluate any toxicity related to this treatment regimen.