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Ann Thorac Surg 2005;80:268-275
© 2005 The Society of Thoracic Surgeons
a Division of Thoracic Surgery, University Hospital, Zurich
b Division of Thoracic Surgery, University Hospital, Bern
c Department of Oncology, University Hospital, Bern
d Department of Biostatistics, University of Zurich, Zurich
e Department of Thoracic and Vascular Surgery, CHUV, University Hospital, Lausanne, Switzerland
Accepted for publication February 1, 2005.
* Address reprint requests to Dr Lardinois, Division of Thoracic Surgery, University Hospital Zurich, Raemistrasse. 100 8091 Zurich, Switzerland (Email: didier.lardinois{at}usz.ch).
Presented at the Forty-first Annual Meeting of The Society of Thoracic Surgeons, Tampa, FL, Jan 24–26, 2005.
BACKGROUND: Mediastinal lymph-node dissection was compared to systematic mediastinal lymph-node sampling in patients undergoing complete resection for non-small cell lung cancer with respect to morbidity, duration of chest tube drainage and hospitalization, survival, disease-free survival, and site of recurrence.
METHODS: A consecutive series of one hundred patients with non-small-cell lung cancer, clinical stage T1-3 N0-1 after standardized staging, was divided into two groups of 50 patients each, according to the technique of intraoperative mediastinal lymph-node assessment (dissection versus sampling). Mediastinal lymph-node dissection consisted of removal of all lymphatic tissues within defined anatomic landmarks of stations 2–4 and 7–9 on the right side, and stations 4–9 on the left side according to the classification of the American Thoracic Society. Systematic mediastinal lymph-node sampling consisted of harvesting of one or more representative lymph nodes from stations 2–4 and 7–9 on the right side, and stations 4–9 on the left side.
RESULTS: All patients had complete resection. A mean follow-up time of 89 months was achieved in 92 patients. The two groups of patients were comparable with respect to age, gender, performance status, tumor stage, histology, extent of lung resection, and follow-up time. No significant difference was found between both groups regarding the duration of chest tube drainage, hospitalization, and morbidity. However, dissection required a longer operation time than sampling (179 ± 38 min versus 149 ± 37 min, p < 0.001). There was no significant difference in overall survival between the two groups; however, patients with stage I disease had a significantly longer disease-free survival after dissection than after sampling (60.2 ± 7 versus 44.8 ± 8 months, p < 0.03). Local recurrence was significantly higher after sampling than after dissection in patients with stage I tumor (12.5% versus 45%, p = 0.02) and in patients with nodal tumor negative mediastinum (N0/N1 disease) (46% versus 13%, p = 0.004).
CONCLUSION: Our results suggest that mediastinal lymph-node dissection may provide a longer disease-free survival in stage I non-small cell lung cancer and, most importantly, a better local tumor control than mediastinal lymph-node sampling after complete resection for N0/N1 disease without leading to increased morbidity.
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