Received: 18 September 2020
Accepted: 12 March 2021
First Online: 7 April 2021
: The study was approved by the Ethics Committee of the Tumour Hospital of Harbin Medical University. According to the raw data management rules and regulations of the Tumour Hospital of Harbin Medical University, the researcher (Zhao Wenhui) needed to submit an application to access the cases, the undergraduate room director (Zhang Qingyuan) to sign, and then the medical record room director (Li Xiang) to agree to sign. After ZWH’s application, ZQY and LX agreed to conduct research and granted permission to view raw data. This study is a retrospective study, and it would not increase additional risks to patients due to the enrollment of the study; the study samples were de-identified information collection, which completely protected the information and privacy of the subjects, and did not involve the specific situation of any patient; All patients in this study signed an informed consent form in their previous medical records: the informed consent form was used for the second use of medical raw data. When the data was collected in this study, verbal confirmation was performed again, and the patient’s medical record data was included after the patient’s consent was obtained. The Ethics Committee fully discussed, and after fully weighing the risk-benefit ratio, made an opinion to waive the signing of informed consent.
: Not applicable.
: This study is no potential conflicts of interest.