The study investigated the efficacy and safety of a selective lymph node strategy (no lower mediastinal lymph node dissection for upper lobe tumors and no upper mediastinal lymph node dissection for lower lobe tumors) in patients with 0.5 \< CTR \< 1 and ≤ 2 cm in diameter cT1N0M0 infiltrating NSCLC, aiming to more accurately assess the prognosis of the selective lymph node dissection strategy for nodes with 0.5 \< CTR \< 1 and ≤ 2 cm in diameter.
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