1,2-Dimyristoyl-rac-glycerol is a protein kinase C activator. 1,2-Dimyristoyl-rac-glycerol inhibits growth of lymphoblast solid tumors by enhancing endogenous glucocorticoid action, without increasing plasma corticosterone or ACTH levels. 1,2-Dimyristoyl-rac-glycerol can be used for the research of lymphoblast tumor.