SLC30A2 and gastric cancer: ROC analysis of the predictive efficiency of SLC30A family genes suggested that most of these genes had high diagnostic value for distinguishing GC patients from healthy individuals, including SLC30A1 (0.672), SLC30A2 (0.612), SLC30A4 (0.762), SLC30A5 (0.698), SLC30A6 (0.817), SLC30A7 (0.857), and SLC30A8 (0.765).