**5. Summary**

Clinical proof of concept for polymer conjugates has already been achieved over the last three decades, with a family of polymer-protein conjugates reaching the market and a growing list of polymer-drug conjugates currently in clinical studies. The application of polymer-anticancer drug conjugates in anticancer treatment is a promising field with growing opportunities to achieve medical treatments with highly improved therapeutic value (Vicent et al., 2008). PG-PTX conjugate can improve the anticancer activity, enhance the safety and efficacy, ameliorate the pharmacokinetic properties and so on. Therefore, the application of PG-PTX facilitates the clinical therapy of a variety of human cancers.

However, many challenges still exist, providing opportunities to improve this platform technology further. The clinical development of anticancer agents utilizing various delivery systems is actively undergoing. New technologies and multidisciplinary approaches to develop advanced drug delivery systems, applicable to a wide range of anticancer agents, may eventually lead to an effective cancer therapy in the future.
