TNFAIP8 and gastric cancer: In order to examine the biological role of TNFAIP8 in gastric cancer cells, the present study knocked down the TNFAIP8 gene in SGC-7901 and MKN-28 cell lines, which exhibited higher protein expression levels of TNFAIP8, and performed qRT-PCR and western blot analyses to confirm the knockdown efficiency.