Selective Lymph Node Resection for Invasive Non-small Cell Lung Cancer With the CTR of 0.5-1 and the Diameter of ≤ 2 cm

For 0.5 \< CTR \< 1 and ≤ 2 cm diameter cT1N0M0 invasive non-small cell lung cancer patient sex for selective lymph node (lower mediastinal lymph nodes are not required to be cleared for upper lobe tumors and upper mediastinal lymph nodes are not required to be cleared for lower lobe tumors)