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(A) Antitumor activity of Taxol, POEG-b-PFTS prodrug micelles and PTX-loaded POEG-b-PFTS micelles in a syngeneic murine breast cancer model (4T1.2). Five injections were given on days 1, 2, 5, 8 and 11 and each point represents the mean of tumor size (n = 5). *P < 0.05; **P < 0.01. (B) Changes of body weight in mice receiving different treatments.
