Funding for this research was provided by:
National Natural Science Foundation of China (81972860)
National Key Projects of Research and Development of China (2016YFC0904600)
Beijing Clinical Application Research Project (Z171100001017116)
Received: 12 June 2020
Accepted: 17 November 2020
First Online: 26 November 2020
Ethics approval and consent to participate
: This study was approved by Institutional Review Board of Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College (approval number 15-057/984) and informed consent is waived from Institutional Review Board as its retrospective nature.
: Not applicable.
: The authors declare that they have no competing interests.