Funding for this research was provided by:
PUMC Youth Fund (2016-XHQN03)
the Fundamental Research Funds for the Central Universities, Innovation Fund for Medical Sciences (CIFMS, 2016-I2M-1-015)
National Natural Science Foundation of China (81670376)
Received: 7 May 2019
Accepted: 19 November 2019
First Online: 6 January 2020
Ethics approval and consent to participate
: The collection of tissue samples and the clinical and pathological information was approved by Fuwai Hospital. All patients provided written informed consent to participate in the study, and the research conformed with the principles of the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.