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Objective: To evaluate the frequency and risk of postoperative complications and mortality in patients with IIIa-N2 non small cell lung cancer after induction chemotherapy and surgery., Methods: In a surgical database records from ninety two patients, operated between January 1, 2000 and December 31, 2006 were reviewed. Univariate analysis was used to identify predictors of postoperative complications and in-hospital mortality., Results: All cases were histologically confirmed stage IIIa-N2. All patients received preoperative platinum based chemotherapy without radiotherapy. Pneumonectomy was performed in 20 cases (23.5%), from which 9 right sided. (Bi)lobectomy was performed in 53 cases (62.4%) and sleeve lobectomy in 11 cases (17.2%). One wedge resection was performed (1.2%). In 7 cases (7.6%) only an exploration was done. Complications developed in 35 patients (38%). Major complications in 15 patients (16%). No bronchopleural fistulae were observed. Analysis identified increased age and high physiological and operative severity score for the enumeration of mortality and morbidity (POSSUM) as a risk factor to develop complications, and a high simplified comorbidity score as a risk factor to develop a major complication. Higher age, Charlson comorbidity index, simplified comorbidity score and POSSUM were a risk factor for developing pneumonia., Conclusion: Although surgery after induction therapy for IIIa-N2 NSCLC can be done with a morbidity and mortality comparable to surgery alone, it remains a high risk operation. It should therefore be performed in a center with experience. Bronchial stump protection should be used whenever there is an increased risk for developing a bronchopleural fistula. In deciding whether to do surgery or radiotherapy one should keep in mind the feasibility of performing a complete resection together with a preoperative assessment to predict complications and mortality. For the preoperative assessment several scoring systems can be used from which we find the simplified comorbidity score most useful.