J Thorac Cardiovasc Surg 2011 Mar
Randomized trial of mediastinal lymph node sampling versus complete lymphadenectomy during pulmonary resection in the patient with N0 or N1 (less than hilar) non-small cell carcinoma: results of the American College of Surgery Oncology Group Z0030 Trial.   

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The NCCN guidelines call for pathological mediastinal lymph node staging for all NSCLC except in solid tumors <1cm and non-solid lesions < ...