Tubulin inhibitor 8 is an inhibitor of tubulin and various cancer cell lines and inhibits tubulin polymerisation and K562 cell growth with an IC50 of 0.73 μM and 14 nM respectively.

This peptide is a scrambled sequence of NADPH oxidase assembly peptide inhibitor gp91 ds-tat. It is used as a control peptide. It is two amino acid residues shorter at the N-terminus compared to the scrambled gp91 ds-tat.

PGP-4008 is a selective and potent P-glycoprotein (Pgp) inhibitor that inhibits tumor growth by co-administration with Doxorubicin.