These genes include HMGA1 in glioma [42], AKT1 in glioma [9], PTC [13], GC [17], and HCC [18, 20], HEMGN in PTC [12], APLN [15] and MMP19 [16] in GC, WNT1 in CRC[56], NUPR1 in CRC [22] and OSCC [35], LY6E [36] and CTSB [24] in CHOL, KLK4 [28] and PLXNB2 [27] in OC, and HDAC4 [32] and STAT3 [31] in SaOS. The gene discussed is KLK4; the disease is gastric cancer.