2-Methoxycinnamaldehyde (2-MCA) is a natural compound of Cinnamomum cassiahas been widely studied with regard to its antitumor activity.

8-epi-Helenalin is a semitterpene lactone with anti-tumor activity that can be isolated from Inula britannicaL. var. chinensis (Rupr.) Reg. and the ED50 values of 8-epi-Helenalin for HL-60, A549, MCF7, HCT-15, SK-OV-3 and Malme-3M are 12.2 μM, 53.8 μM, 9.1 μM, 8.7 μM, 18.7 μM and 8.3 μM, respectively. 8-epi-Helenalin can be used for anti-tumor studies.

PIN1 inhibitor API-1 is a specific Pin1 inhibitor (IC50: 72.3 nM). PIN1 inhibitor API-1 retains the active conformation of pXPO5 and restores the ability of pXPO5 to transport pre-miRNAs from the nucleus to cytoplasm, thus up-regulating the anticancer miRNA biogenesis to suppress both in vitro and in vivo hepatocellular carcinoma development.