TP53 and gastric cancer: To evaluate whether miR‐769‐5p is involved in p53‐mediated apoptosis of GC cells, miR‐769‐5p expression in BGC823 and SGC7901 cells was overexpressed and knocked down by miR‐769‐5p mimics and inhibitors, respectively, after which the expressions of p53 mRNA and protein were analysed.