KIAA1363 is a recently characterized 2-acetyl monoacylglyceryl ether hydrolase that is critical to the survival and proliferation of many cancer cell lines. 2-thioacetyl MAGE is a colorimetric substrate for KIAA1363. It can readily be adapted to perform activity/inhibition studies of this new enzyme, using standard DTNB detection of the free thiol as a readout for enzymatic activity.