Dolastatin 10 is a unique pentapeptide that isolated from the sea hare Dolabella auricularia . These in vitro data are quite comparable to those of Dolastatin 10 and Auristatin PE, each of which has GI 50 values of 10 −5 -10 −6 μg/mL (10 −2 -10 −3 nM) against a similar minipanel of human cell lines. The antibody-drug conjugate (ADC) comprises the anti-CD30 monoclonal antibody cAC10 conjugated to the cytotoxic agent monomethyl auristatin E (MMAE), a synthetic analog of the tubulin polymerization inhibitor Dolastatin 10.