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. Author manuscript; available in PMC: 2011 Feb 17.
Published in final edited form as: Adv Drug Deliv Rev. 2009 Nov 14;62(2):122–149. doi: 10.1016/j.addr.2009.10.004

Fig. 6.

Fig. 6

Structures of PK1 and PK2, first HPMA copolymers evaluated in clinical trials [68]. Conjugate PK1 contains doxorubicin bound to HPMA copolymer via a tetrapeptide sequence stable in the blood stream but susceptible to enzymatically catalyzed hydrolysis in the lysosomes. Conjugate PK2 contains in addition side-chains terminated in N-acylated galactosamine complementary to the asialoglycoprotein receptor on hepatocytes.