Ethics approval and consent to participate
Cancer
CANCER
The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Ethics Committee of Jiangsu Cancer Hospital (Nanjing, China). Approval number: R-2020-039; Approval date: 5 November, 2020. This article is a retrospective study; therefore, the Ethics Committee of Jiangsu Cancer Hospital & Jiangsu Institute of Cancer Research & The Affiliated Cancer Hospital of Nanjing Medical University waived the requirement to obtain written informed consent from the patients. The authors did not obtain any information identifying individual participants during or after data collection.