Funding for this research was provided by:
National Natural Science Foundation of China (81801895, 81672407, 81872001)
Guangdong Natural Science Funds for Distinguished Young Scholar (2015A030306001)
Received: 14 November 2019
Accepted: 22 June 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: The approval of the current study was granted by the Institute Research Medical Ethics Committee of Sun Yat-sen University Cancer Center. All of the samples were anonymized. No written or verbal informed consent was obtained for use of the retrospective data from the patients in the current work, since most of them were deceased and it was not deemed necessary by the Ethics Committee, who waived the need for consent.
: Not applicable.
: The authors declare that they have no competing interests.