Polymers havebeen crucial to the development of drug deliverytechnology because they provide cyclic dosage, adjustable releaseof both hydrophilic and hydrophobic medicines, and controlled releaseof nanomedicines in constant doses over long periods of time.241 In one study, Beclin-1 siRNA and DOX were deliveredto cancer cells simultaneously using 1,3-diol-rich hyperbranched polyglycerol(HBPO) and phenylboronic acid-tethered hyperbranched oligoethylenimine(OEI600-PBA). Here, BECN1 is linked to cancer.