CCAT2 was able to positively regulate the expression of POU5F1B gene. Furthermore, silencing of CCAT2 gene inhibited the proliferation of BGC-823 cells, as well as induced apoptosis and autophagy in BGC-823 cells, by suppression of the PI3K/mTOR signaling pathways.Recent studies confirmed that the lncRNA CCAT2, located at the 8q24 amplicon of the cancer risk-associated rs6983267 SNP, regulated the cancer metabolism in vitro and in vivo by directly interacting in an allele-specific manner with a protein complex. The chromosomal region 8q24 emerged as an important region for genetic susceptibility in various cancer types, thus DNA methylation or SNPs at this locus may contribute to cancer risk. RT-qPCR results revealed that CCAT2 gene expression was effectively suppressed by the transfection, while POU domain class 5 transcription factor 1B (POU5F1B) gene expression was significantly decreased.