Inhibitory effects of lanostane-type triterpene acids, the components of Poria cocos, on tumor promotion by 12-O-tetradecanoylphorbol-13-acetate in two-stage carcinogenesis in mouse skin. - Kaminaga,T.; Yasukawa,K.; Kanno,T.; Nunoura,Y.; Takido,M. (Oncology, 1996)