miR-567 suppresses the PI3K/AKT-c-Myc pathway via targeting PIK3AP1. CCK-8 assay (A), colony formation assay (B), FACS assays (C) and EdU incorporation assays (D) showed miR-567-inhibited cell proliferation was counteracted after administration of PIK3AP1, Student's t-test, mean ± SD, *P < .05; **P < .01; ***P < .001. (E) The miR-567-induced downregulation of relevant proteins in cell cycle marker (CDK4, CDK6 and CyclinD1) as well as upregulation of pro-apoptosis proteins and cell cycle marker p21 were abrogated after administration of PIK3AP1 in MGC803 and BGC823 cells. (F) PIK3AP1 overexpression reversed miR-567-induced cell sensitivity to 5-FU compared to control cells. Student's t-test, mean ± SD, ***P < .001.