[Stage III NSCLC. The surgeon's role in exploration and treatment].

The role of surgery in stage IIIA non-small cell lung cancer (NSCLC) remains controversial. Different restaging techniques exist to evaluate response after induction therapy and these are subdivided into non-invasive, invasive and alternative or minimally invasive techniques. Remediastinoscopy provides pathological evidence of response after induction therapy. Stage IIIA-N2 NSCLC represents a heterogeneous spectrum of locally advanced disease and different subsets exist. When N2 disease is discovered during thoracotomy a resection should be performed if this can be complete. Most patients with pathologically proven N2 disease detected during preoperative work-up will be treated by induction therapy followed by surgery or radiotherapy. In two large, recently completed, phase III trials there was no difference in overall survival between the surgical and radiotherapy arm. Surgical resection may be recommended in those patients with proven mediastinal downstaging after induction therapy who can preferentially be treated by lobectomy. Patients with bulky N2 disease are mostly treated with combined chemoradiotherapy although the precise treatment scheme has not been determined yet. Also, stage IIIB is mostly treated by concurrent or sequential chemoradiotherapy. Surgery is rarely indicated in T4N0-1 disease unless a complete resection can be obtained, in some selected cases after induction therapy.