a drug used to treat breast cancer that has spread or that has come back within 6 months after chemotherapy. it is also being studied in the treatment of newly diagnosed breast cancer and other types of cancer. abi-007 is a type of mitotic inhibitor. also called nanoparticle paclitaxel, protein-bound paclitaxel, paclitaxel albumin-stabilized nanoparticle formulation, and abraxane.