Prognostic factors of resected node-positive lung cancer: location, extent of nodal metastases, and multimodal treatment.

[ 22 ], in fact, reported that 41% of 94 patients with a single involved mediastinal level were 5-year survivors, and the difference between the ratio for these patients and that in the patients with 2 or more involved levels (13%) was highly significant ( P =0.001) [ 22 ].

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