To further investigate whether HOXD-AS1 enhanced the response of gastric cancer cells to DDP via regulating PDCD4 expression, si-con, si-HOXD-AS1 or si-HOXD-AS1 + si-PDCD4 were transfected into BGC823/DDP and SGC7901/DDP cells. Here, HAGLR is linked to gastric cancer.