This study was undertaken to determine the survival of patients with unresectable and refractory non small cell lung cancer (NSCLC) submitted to thoracic stop-flow perfusion (TSP). Forty-five patients with NSCLC confined to thoracic region entered the study. All 45 patients had been pretreated with some form of chemotherapy and had progression of disease. The cytostatic regimen was mitomycin 10 mg/m2, navelbine 25 mg/m2 and cisplatin 60 mg/m2. In 39/45 patients, immediately after TSP, hemofiltration was performed to reduce systemic side effects There were 16/45 responses to the first TSP (CR 0; PR 16): a response rate of 35.6%. Median time to progression was 4 months. Median survival was 7.5 months.1-year survival rate was 36.4%, 2-year survival rate was 14%, and 3-year survival rate was 5.7%.