“…The detailed selection procedure was presented in Figure . Finally, a total of 26 articles (Absenger et al, ; Chen et al, ; Colloca, Venturino, & Guarneri, ; Conroy et al, ; Cox et al, ; Deng et al, ; Dirican et al, ; Du & Lu, ; Gao et al, ; Grenader et al, ; Grenader et al, ; Hala & Ahmed, ; Inoue et al, ; Jin et al, ; B. S. Lee et al, ; Liu et al, ; Lu et al, ; Neal et al, ; Park et al, ; Song et al, ; Suzuki et al, ; Szkandera et al, ; Wood et al, ; Ying et al, ; Zhou et al, , ) with 13,945 GI tumor patients were enrolled, and these cases were diagnosed with eight different kinds of digestive cancers, including three GI tract tumors, and five malignant neoplasms of the hepatobiliary pancreatic system. All these 26 research were evaluated in 9 different countries, including China (11 studies), UK (5 studies), Austria (2 studies), Japan (2 studies), South Korea (2 studies), Italy (1 study), France (1 study), Egypt (1 study), and Turkey (1 study).…”