The results indicate that proteins MMP-2 zymogen, MMP-2 active form, the catalytic domain of MMP-2 [33], MMP-3, MMP-9/lipocalin, MMP-9 zymogen, MMP-9 active form, TIMP-1/MMP-1, TIMP-1 monomer, and TIMP-3 dimer are not associated with the development of GC. Here, MMP9 is linked to gastric cancer.