ANPEP and cancer: Taken together, the biological assays described in this study show that APN and its pyrimidinethylcarbamate analogues Me-APN, Cbz-APN and Bzn-APN all exhibited moderate cytotoxicity to all the cancer cell types tested in this study (breast, cervical and ovarian) when used in the low micromolar concentration range as determined using a range of functional assays.