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PURPOSE: Feasibility trial to test the toxicity and outcome of three cycles of induction chemotherapy followed by limited surgery in medically inoperable early stage NSCLC patients. PATIENTS AND METHODS: Thirteen patients with NSCLC (stages I-IIIB) with insufficient cardio-respiratory reserves for the oncologically required lung resection, received three cycles of induction chemotherapy with cisplatin (100mg/m(2)) and docetaxel (85mg/m(2)) followed by parenchyma-sparing lung surgery. Operability was evaluated with pulmonary function tests, perfusion scintigraphy and cardiopulmonary exercise testing. In selected patients coronary angiography or myocardial perfusion scintigraphy was performed. Rate of R0-resections was taken as primary outcome. RESULTS: Twelve of 13 patients received the three cycles of chemotherapy as planned. The main grade 3/4 hematological toxicity was neutropenia (62%), non-hematological toxicity was neutropenic fever (23%) and cough/dyspnea (31%). Complete, partial and stable responses to chemotherapy were seen in 1, 10 and 2 patients, respectively-the overall response rate was 85%. No patient had tumor progression. Eleven/13 (85% (CI 95% 54, 97) %) patients underwent surgery (4 lobectomies, 2 segmentectomies, and 5 wedge resections), all had a pathologically complete resection of the tumor. There was one postoperative death due to myocardial infarction. The median disease-free and overall survivals were 57(CI 95% 36-78) months and 66(CI 95% 40-92) months, with a median follow up time of 58 months. The 1-, 2- and 4-year OS was 85%, 85% and 67%, respectively. There were no significant changes in any lung function parameter compared to the preoperative assessment. The FEV(1) showed a trend for improved values after surgery. CONCLUSION: Induction chemotherapy in medically inoperable patients followed by parenchyma-sparing surgery is feasible and yields very promising results.