This review covers water-soluble polymer-drug conjugates and macromolecules that possess biological activity without attached low molecular weight drugs. The main design principles of traditional and backbone degradable polymer-drug conjugates as well as the development of a new paradigm in nanomedicines - (low molecular weight) drug-free macromolecular therapeutics are discussed. To address the biological features of cancer, macromolecular therapeutics directed to stem/progenitor cells and the tumor microenvironment are deliberated. Finally, the future perspectives of the field are briefly debated.
Keywords: Cancer; Degradable polymeric carriers; Drug-free macromolecular therapeutics; Macromolecular therapeutics; N-(2-hydroxypropyl)methacrylamide; Water-soluble polymers.
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