COL4A2 and gastric cancer: 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).