Open Label Study of DS-5573a

"Step 1 of this study will use a starting intravenous (IV) dose of 0.1 mg/kg. Eight dose levels are planned, level 1: 0.1 mg/kg, level 1.5: 0.1 mg/kg, 0.3 mg/kg, level 2: 0.3 mg/kg, level 3: 1 mg/kg, level 4: 3 mg/kg, level 5: 10 mg/kg, level 6: 20 mg/kg, level 7: 30 mg/kg.~Step 2: 30 subjects will use the dose determined in Step 1."