Received: 23 February 2021
Accepted: 11 March 2022
First Online: 8 April 2022
: All studies in TCGA database and GEO database have received ethical approvals from ethics committees of their respective research institutes. These studies obtained informed consent from patients before admission. Details of all patients in public datasets have been anonymously processed and therefore the current research does not involve patients' privacy information. The current study was a second study based on public datasets from TCGA database and GEO database. The current study was performed according to public database policy and declaration of Helsinki. Therefore, ethical approval and informed consent were not applicable according to above reasons.
: All authors reviewed the manuscript and consented for publication. The current manuscript did not contain information or images that could lead to identification of a study participant and therefore it is not applicable for the specific consent to publish the information/image(s) in an online open-access publication.
: The authors declare no potential conflicts of interest.