ZFAS1 and gastric cancer: To investigated the biological function of ZFAS1 in gastric cancer cells, ZFAS1 expression was knockdown in BGC823 and SGC7901 cells by transfection with siRNAs or shRNA vector, and over-expressed by transfected with pCDNA-ZFAS1 vector (Supplementary Figure S1B–S1D).