Department of Oncology;
the Second Affiliated Hospital of Xi’an Jiaotong University;
Center for Translational Medicine;
Frontier Institute of Science and Technology;
Xi’an Jiaotong University;
School of Chemistry and Chemical Engineering;
Shaanxi Normal University;
Apurinic; endonuclease; 1; Single; nucleotidepolymorphism; Gastrointestinal; cancers; Cancer; risk; Meta-analysis;