Other DE genes, such as COL1A2 [26], OLFM4 [27], THBS2 [28], CEACAM6 [29], CTSE [30], AKR1B10 [31], and KCNE2 [32], also have been reported to be differentially expressed in GC patients comparing to controls. Here, COL1A2 is linked to gastric cancer.