SEMA3B and gastric cancer: Next, we verified the SEMA3B-AS1 mRNA expression level in five gastric cancer cell lines (AGS, HGC-27, MGC-803, MKN-45, and SGC-7901) and a normal stomach mucosal cell line (GES-1) through qRT-PCR assay, and it was also demonstrated that SEMA3B-AS1 expression was decreased in GC cells compared to GES-1 cells (Figure 1(b)).