Retraction Note: RGD peptide-pegylated PLLA nanoparticles containing epirubicin hydrochloride exhibit receptor-dependent tumor trafficking in vitro and in vivo

Purpose A novel hydrophilic conjugate of arginine-glycine-aspartic acid (RGD) and polyethylene glycol (PEG), i.e., RGD-PEGMw (MW = 300, 600, 1000 or 4000), was synthesized and employed in epirubicin (EPI) loaded poly L-lactic acid (PLLA) nanoparticles (NPs) to improve its tumor targeting effect.