PPP1R15A and gastric cancer: The lentivirus packaged with PPP1R15A overexpression vector was constructed to investigate the protumor role of PPP1R15A in GC in vivo, and HGC-27 with stable overexpressed PPP1R15A (OE group) was selected to develop the transplantation tumor model in nude mice, and the empty vector was established as control (EV group).