BCL2 and gastric cancer: When investigating the anticancer activity of oleanolane triterpenes extracted from Nansheteng (Celastrus orbiculatus) in the gastric cancer BGC‐823 cell line, it was found that it could significantly reduce the mitochondrial membrane potential of BGC‐823 cells, induce cell apoptosis, and at the same time, down regulate Bcl‐2 protein expression and up regulate cleaved‐caspase‐3 protein expression.