CD44 and cancer: The chondroitin-sulfate modified CD44 receptor is able to bind to triple helical sequence from collagen Type IV (Rezler et al., 2007); Fields and co-workers thus developed CD44-binding, collagen-mimetic peptides [(GPO)4GVKGDKGNPGWPGAP(GPO)4] and used them to modify liposomes as a DDS to cancer cells with highly expressed CD44 cell receptor (Table 2).