Four- to six-week-old nude mice (BALB/c) were purchased from Jiangsu Jicui Yaokang Biotechnology Co. Ltd. (Nanjing, China) and then randomly divided into 3 groups (n = 5 per group). PO-BDNF-AS-HGC-27 cells, PONC-BDNF-AS-HGC-27 cells, or PO-BDNF-AS + PO-FBXW7-HGC-27 cells (5 x 10⁶) were suspended in 100 ul DMEM and subcutaneously injected into the flanks of the mice in each group. After 10 days, we measured the tumor size every week using digital Vernier calipers and calculated the tumor volume based on the formula: volume = 1/2 x (width2 x length). On the 30th day or when the tumor became larger than 1.5 cm in diameter, the mice were sacrificed. Subsequently, the subcutaneous graft tumors were removed for further experiments. For the intraabdominal tumor model, we randomly divided the mice into two groups (n = 6 per group). PO-BDNF-AS-HGC-27 cells or PONC-BDNF-AS-HGC-27 cells (8 x 10⁶) were suspended in 150 uL DMEM and intraperitoneally injected into the mice in each group (weight, approximately 18.0-19.0 g). Five weeks after injection, the mice were euthanized and necropsied to assess abdominal tumor burden and tumor location. Finally, we detected the mRNA and protein expression levels of relevant genes in the tumor tissues by RT-PCR and western blotting assays.