TGM2 and gastric cancer: Using the previously analyzed microarray data for 80 gastric cancer samples from the GEO database (GSE27342), we selected the ten samples with the highest expression levels of TGM2 (TGM2_H) and ten samples with the lowest expression levels of TGM2 (TGM2_L) and performed GSEA15 comparing these two groups (Fig. S4).