TMEM139 and gastric cancer: Except for the presented DEGs, there are other genes in the list of the DEGs, such as KLK7, KLK10, COL4A1, TGM2, PDGFRB, etc. in GC-NAG; and CDX2, MUC2, TMEM139, TRIM36, SLC7A9, etc. in GC-IM.