Surgery for stage IIB-IIIB small cell lung cancer.

"Declarations Ethics approval and consent to participateThe study was conducted in accordance with the Declaration of Helsinki (as revised in 2013) and the Harmonized Tripartite Guideline for Good Clinical Practice from the International Conference on Harmonization. The ethical approval and individual patient consent was exempt from the institutional review board of Medical Graduate School, Nanchang University, because SEER is a public database and the data are de-identified. The authors confirm that they are accountable for all aspects of the work (including full data access, integrity of the data and the accuracy of the data analysis) in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This study was funded by Clinical Research Plan of SHDC (Grant No. SHDC2020CR2020B) and Shanghai Pulmonary Hospital (Grant No.FKCX1904, No.FKLY20004, No.Lung Cancer Diagnosis and Treatment Center)."