Funding for this research was provided by:
National Natural Science Foundation of China (81760531, 31760330, 31860321)
Received: 20 November 2019
Accepted: 19 March 2020
First Online: 19 May 2020
Ethics approval and consent to participate
: This research complied with the Helsinki Declaration and was approved by the Human Ethics Committee and the Research Ethics Committee of Yanbian University Medical College in China. All patients provided written informed consent according to institutional guidelines. Patients were informed that the resected specimens were stored by the hospital and might potentially be used for scientific research, and that their privacy would be maintained. Follow-up survival data were collected retrospectively through medical-record analyses.
: Not applicable.
: The authors declare that they have no competing interests.