TLR9 and gastric cancer: Increasing expression of TLR2, TLR4, TLR5, and TLR9 in gastric epithelia of children' gastritis [64]; TLR4, TLR5, and TLR9 in adults' gastritis [60]; TLR2, TLR4, and TLR5 in gastric dysplasia [65]; and TLR4, TLR5, and TLR9 in gastric cancer (GC) [61] is found.