Funding for this research was provided by:
National Natural Science Foundation of China (81874143, 31971192)
Natural Science Foundation of Beijing Municipality (7192035)
National Key Basic Research Development Program of China (2014CBA02001)
Received: 4 August 2020
Accepted: 15 October 2020
First Online: 24 October 2020
Ethics approval and consent to participate
: The Ethics Committee of Beijing Cancer Hospital approved the study protocol (reference No. 2015KT32), which was performed in compliance with the Helsinki Declaration.
: We just extracted data and did not involve the private information of patients.
: There are no conflicts of interest to declare.