As a retrospective study, 586 NSCLC patients are included, where patients have received 18F-FDG PET/CT one month prior to treatment at the First Hospital of Chongqing Medical University from January 2015 to December 2020. The retrospective study is approved by the Ethics Committee of the Centre and waives the requirement of informed consent. CT/PET scanning can be an important tool for preoperative diagnosis, treatment guidance and efficacy assessment in lung cancer patients.