JAG1 and gastric cancer: Detecting by qRT-PCR, the relative mRNA expression of FGF18 was upregulated in seven out of eleven (63.6%) GC cell lines (AGS, MKN1, MKN28, MKN45, MGC-803, SGC-7901, and KATOIII; *, P < 0.05; **, P < 0.001) (Fig. 1b).