Figure 9 shows the remarkable difference in overall survival between the low- and high-expression groups. GC patients with high COL1A1, COL1A2, COL3A1, COL5A2, COL4A1, FN1, COL5A1, COL4A2, and COL6A3 expression levels showed worse overall survival (Fig. 9). This evidence concerns the gene COL4A1 and gastric cancer.