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Cytotoxicity of free PTX, PTX/PEG5K-FTS2(L) and PTX/PEG5K-FTS2(S) against a mouse breast cancer cell line 4T1.2 (A), two androgen-independent human prostate cancer cell lines DU145 (B) and PC-3 (D), and a human colon carcinoma cell line HCT-116 (C). Cells were treated for 72 h and cytotoxicity was determined by MTT assay. Values are reported as the means ± SD for triplicate samples.
