YAP1 and gastric cancer: The purposes of the present study were to detect the expression of YAP1 in GC specimens, and correlation with the prognosis of patients with GC, to investigate the effects of stable YAP1 silencing and overexpression on the biological characteristics of GC and human immortalized normal gastric mucosa cells in vitro and in vivo, and to delineate the role of YAP1 in gastric tumorigenesis and progression.