Docetaxel (DOX) is usually one of drugs used for breast cancer treatment. The key of targeted drug delivery therapy is to deliver effective drugs directly and safely to the tumor focus via an efficient targeting drug carrier with immunogenicity. In this study, Long-circulating targeted drug carrying microspheres (DOX-PEG-EpCAM-MNs) entrapping DOX were constructed. In addition, both cytotoxicity and magnetic resonance imaging (MRI) analyses were performed to establish a mouse model and further complete corresponding performance analysis.The results showed that the average particle size of DOX-PEG-EpCAM-MNs was 139.3 ± 1.6 nm. Morphological analysis proves that they are spherical and uniformly dispersed. The Corresponding entrapment rate and drug carrying capacity are 82.43% and 7.16% respectively. Additionally, MRI shows that they have the capability to track tumor cells within 5 days. This study established a safe and efficient breast cancer cells targeted long-circulating drug delivery system.
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