4.6 Article

Small-sized polymeric micelles incorporating docetaxel suppress distant metastases in the clinically-relevant 4T1 mouse breast cancer model

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BMC CANCER
卷 14, 期 -, 页码 -

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BMC
DOI: 10.1186/1471-2407-14-329

关键词

Small-sized polymeric micelles; Docetaxel; Metastasis; 4T1 Mammary carcinoma; Malignant breast cancer; Primary tumor resected

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资金

  1. National Natural Science Foundation of China [81373342]
  2. Beijing Natural Science Foundation [2141004, 7142114]
  3. Youth Foundation of Peking Union Medical College [2012G07]

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Background: The small size of ultra-small nanoparticles makes them suitable for lymphatic delivery, and many recent studies have examined their role in anti-metastasis therapy. However, the anti-metastatic efficacy of small-sized nanocarriers loaded with taxanes such as docetaxel has not yet been investigated in malignant breast cancer. Methods: We encapsulated docetaxel using poly(D, L-lactide) 1300-b-(polyethylene glycol-methoxy) 2000 (mPEG(2000)-b-PDLLA(1300)) to construct polymeric micelles with a mean diameter of 16.76 nm (SPM). Patient-like 4T1/ 4T1(luc) breast cancer models in Balb/c mice, with resected and unresected primary tumors, were used to compare the therapeutic efficacies of SPM and free docetaxel (Duopafei) against breast cancer metastasis using bioluminescent imaging, lung nodule examination, and histological examination. Result: SPM showed similar efficacy to Duopafei in terms of growth suppression of primary tumors, but greater chemotherapeutic efficacy against breast cancer metastasis. In addition, lung tissue inflammation was decreased in the SPM-treated group, while many tumor cells and neutrophils were found in the Duopafei-treated group. Conclusion: Small-sized mPEG(2000)-b-PDLLA(1300) micelles could provide an enhanced method of docetaxel delivery in breast cancer metastasis, and may represent a valid chemotherapeutic strategy in breast cancer patients with resected primary tumors.

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