Text and Data Mining valid from 2019-11-11
Received: 13 April 2019
Accepted: 29 August 2019
First Online: 11 November 2019
Ethics approval and consent to participate
: This study was conducted according to the regulations defined by the Ethics Committee of SYSUCC. The official approval by the committee was waived, as this is a retrospective study using archived tissue samples.
: Not applicable
: The authors declare that they have no competing interests.