The trial was designed to compare the effectiveness of radical resections of lung cancer plus adjuvant chemotherapies and perioperative chemotherapies in the patients with N2 non-small cell lung cancer

The trial is a multi-centre real-world non-interventional observational study. The Chinese patients with N2 non-small cell lung cancer enrolled from 2014 to 2017 who received radical resections of lung cancer and adjuvant chemotherapies will be included in the study and the study data on patient demographic/tumor biological characteristics and clinical treatment will be collected to evaluate compare effectiveness of radical resection of lung cancer plus adjuvant chemotherapies and perioperative chemotherapies after surgeries.

Inclusion Criteria:

• Patients with radical resection of lung cancer enrolled from 2014 to 2019;
• Pathologically diagnosed patients with non-small cell lung cancer;
• Patients with age > 18 years old;
• Patients who did not receive chest surgeries before hospitalization;
• Patients with N2 lymph nodes (+) after surgeries;
• Patients who received lymphadenectomy for one group or more groups of lymph nodes;

Exclusion Criteria:

• Patients with second primary tumors or multiple primary tumors;

Pathologically diagnosed Chinese patients with N2 non-small cell lung cancer who received radical resection of lung cancer plus adjuvant chemotherapies and perioperative chemotherapies