This is a phase 1b open-label study evaluating the preliminary safety and maximum tolerated dose of a new formulation of INNO-206 administered at doses of 230 mg/m2, 350 mg/m2 and 450 mg/m2 (165, 260, 325 mg/m2 doxorubicin equivalents, respectively) through intravenous infusion on Day 1 every 21 days for up to 6 cycles.