1. Andersson, D., Liu, J.J., Nilsson, A., Duan, R.D., 2003. Ursolic acid inhibits proliferation and stimulates apoptosis in HT29 cells following activation of alkaline sphingomyelinase. Anticancer Res., 23(4):3317–3322.
2. Andersson, D., Cheng, Y., Duan, R.D., 2008. Ursolic acid inhibits the formation of aberrant crypt foci and affects colonic sphingomyelin hydrolyzing enzymes in azoxymethane-treated rats. J. Cancer Res. Clin. Oncol., 134(1):101–107. [doi:10.1007/s00432-007-0255-4]
3. Cao, K.J., Fan, Q.Y., Liu, Y.L., Huang, R., Yin, C.Z., Ma, G.S., Liu, Z.Q., Wan, D.S., Zeng, Y.X., 2008. Cancer incidence and mortality in Guangzhou City from 2000 to 2002. Chin. J. Cancer, 27(3):225–230 (in Chinese).
4. Cha, H.J., Bae, S.K., Lee, H.Y., Lee, O.H., Sato, H., Seiki, M., Park, B.C., Kim, K.W., 1996. Anti-invasive activity of ursolic acid correlates with the reduced expression of matrix metalloproteinase-9 (MMP-9) in HT1080 human fibrosarcoma cells. Cancer Res., 56(10):2281–2284.
5. Denizot, F., Lang, R., 1986. Rapid colorimetric assay for cell growth and survival. Modifications to the tetrazolium dye procedure giving improved sensitivity and reliability. J. Immunol. Methods., 89(2):271–277. [doi:10.1016/0022-1759(86)90368-6]