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Due to its high structural similarity to folic acid (FA) and the high expression of folate receptor in most solid tumors, MTX not only serves as a cytotoxic agent but also a homing ligand.In this work, the therapeutic effect of methotrexate (MTX)-conjugated Pluronic-based polymeric mixed micelles (F127/P105-MTX) on the folate receptor over-expressing tumors treatment and safety evaluation were investigated.