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- Prodrug Systems (II): a perspective of Polymer-based Doxorubicin Prodrug systems towards chemotherapyPublication . Wang, Zhao; Olim, Filipe; Sun, Jingjing; Neves, Ana Rute; Mendes, Fátima; Tomás, Helena; Sheng, RuilongUtilizing biocompatible polymers as platforms to covalently conjugate with chemotherapeutics to construct polymer-based prodrugs and their nano drug delivery systems has attracted great attention in recent years. This perspective reviewed state-of-the-arts for polymer-based doxorubicin prodrugs and the related nanodelivery systems, including: (1) pH-responsive polymer-doxorubicin prodrugs/conjugates; (2) pH/redox dual responsive prodrugs/conjugates; (3) reactive oxygen species/hypoxia-responsive polymer-doxorubicin prodrugs; (4) tumor receptor targeting polymer prodrugs; (5) enzyme-responsive polymer-doxorubicin prodrugs. Finally, possible future perspectives were also stated and discussed.