MMP7 and cancer: For instance, Cao et al. (2019) demonstrated the use of a smart drug carrier based on a surfactant-like peptide, Nap-FFGPLGLARKRK, for enzyme-triggered cancer-targeted drug delivery.130 This peptide, designed with three functional motifs—an aromatic motif for self-assembly, an enzyme-cleavable segment for responsiveness to cancer-overexpressed matrix metalloproteinase-7 (MMP7), and a positively charged segment for cell membrane interaction—showcases how nanostructures can encapsulate high amounts of anticancer drugs such as doxorubicin (DOX).