Received: 10 November 2020
Accepted: 13 May 2021
First Online: 22 May 2021
: All the Tumor specimens and paratumor specimens were collected with written informed consent in accordance with the Declaration of Helsinki and with the approval of the Ethical Committee of Yantai Affiliated Hospital of Binzhou Medical University.
: Not applicable.
: The authors declare that they have no financial conflicts of interest.