The anticancer activity of non-alkaloid components in Uncaria macrophylla Wall. was studied. The results indicated that ursolic acid showed the strongest activity of inhibiting the proliferation of tumor cells; 3β-6β-23-trihydroxyurs-12-en-28-oic acid, β-sitosterol and 3β-6β-19α-trihydroxyurs-12-en-28-oic acid possessed the same activity, too.
