 Nab-paclitaxel interchangeable with ABRAXANE and ABI-007 is a unique protein formulation of a noncrystalline, amorphous form of paclitaxel in an insoluble particle state. Nab-paclitaxel was designed to improve the chemotherapeutic effects of paclitaxel by exploiting endogenous transport pathways to deliver higher doses of paclitaxel to the tumor and to reduce the solvent-related hypersensitivity and other toxicities associated with Taxol paclitaxel injections, the solvent Cremophor EL, and ethanol vehicle. Nab-paclitaxel provides more rapid tissue distribution and increased tumor accumulation compared to cremophor-EL paclitaxel. Mechanistically, albumin receptor-mediated transport across the endothelium, binding to interstitial proteins, and macropinocytic or receptor-mediated uptake into tumor cells as well as sequestration of paclitaxel by cremophor-EL may contribute to the observed differences. Furthermore, nab-paclitaxel synergizes with gemcitabine in preclinical models. The Cremophor EL-free medium enables nab-paclitaxel to be given at a higher dose and in a shorter duration without the need for premedication to prevent solvent-related hypersensitivity reactions. As of March 2014, nab-paclitaxel is approved under the trade name of ABRAXANE in over 45 countriesregions, including the US, Canada, India, European UnionEuropean Economic Area, South Korea, China, Australia, Bhutan, United Arab Emirates, Nepal, New Zealand, Japan, Russia, Sri Lanka, Argentina, Hong Kong, and Lebanon for the treatment of patients with metastatic breast cancer. ABRAXANE is also approved for the first-line treatment of locally advanced or metastatic non small cell lung cancer NSCLC in the US, Japan, Argentina, Australia, and New Zealand, for treatment of advanced gastric cancer in Japan, and for first-line treatment of metastatic adenocarcinoma of the pancreas in the US, EUEEA, Australia, New Zealand and Argentina. 