Objective:To investigate the effects of betulinic acid(BEA)on the proliferation,apoptosis, migration and invasion of gastric cancer MGC-803 cells,and to elucidate their mechanisms. Methods:The MGC-803 cells were divided into control group and different doses of BEA groups,and the cells were cultured with DMEH high sugar medium containing 0,2.5,5.0,10.0,20.0,40.0,and 80.0 μmol·L~(-1) BEA. The proliferation rates,apoptotic rates,migration rates and the number of invasion MGC-803 cells were detected by CCK-8 method,flow cytometry,scratch test an...