HER2-positive cancer is a cancer that tests positive for a protein called human epidermal growth factor receptor 2 (HER2). HER2 promotes the growth of certain cancer cells. This study will test an experimental drug called DS-8201a that has not been approved by the health authorities yet. DS-8201a will be tested for safety in patients with advanced solid malignant tumors that test positive for HER2. It also will test how DS-8201a moves within the body (pharmacokinetics).
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Pharmacokinetic Parameter of Maximum (Peak) Observed Serum Concentration (Cmax) Following Treatment With DS-8201a and Ritonavir - Cohort 1
Timeframe: Cycle 1: Day 1, pre-dose and end of infusion (EOI); Cycles 2 and 3: Day 1, pre-dose, EOI, 2 hours, 4 hours, 7 hours; Day 2, 4, 8, 12, 17, and 22; Cycles 4, 6 and 8: Day 1, pre-dose and EOI (each cycle is 22 days)
Pharmacokinetic Parameter of Maximum (Peak) Observed Serum Concentration (Cmax) For MAAA-1181a Following Treatment With DS-8201a and Ritonavir - Cohort 1
Timeframe: Cycle 1: Day 1, pre-dose and end of infusion (EOI); Cycles 2 and 3: Day 1, pre-dose, EOI, 2 hours, 4 hours, 7 hours; Day 2, 4, 8, 12, 17, and 22; Cycles 4, 6 and 8: Day 1, pre-dose and EOI (each cycle is 22 days)
Pharmacokinetic Parameter of Area Under the Serum Concentration-time Curve Following Treatment With DS-8201a and Ritonavir - Cohort 1
Timeframe: Cycle 1: Day 1, pre-dose and end of infusion (EOI); Cycles 2 and 3: Day 1, pre-dose, EOI, 2 hours, 4 hours, 7 hours; Day 2, 4, 8, 12, 17, and 22; Cycles 4, 6 and 8: Day 1, pre-dose and EOI (each cycle is 22 days)
Pharmacokinetic Parameter of Area Under the Serum Concentration-time Curve of MAAA-1181a Following Treatment With DS-8201a and Ritonavir - Cohort 1
Timeframe: Cycle 1: Day 1, pre-dose and end of infusion (EOI); Cycles 2 and 3: Day 1, pre-dose, EOI, 2 hours, 4 hours, 7 hours; Day 2, 4, 8, 12, 17, and 22; Cycles 4, 6 and 8: Day 1, pre-dose and EOI (each cycle is 22 days)
Pharmacokinetic Parameter of Maximum (Peak) Observed Serum Concentration (Cmax) Following Treatment With DS-8201a and Itraconazole - Cohort 2
Timeframe: Cycle 1: Day 1, pre-dose and end of infusion (EOI); Cycles 2 and 3: Day 1, pre-dose, EOI, 2 hours, 4 hours, 7 hours; Day 2, 4, 8, 12, 17, and 22; Cycles 4, 6 and 8: Day 1, pre-dose and EOI (each cycle is 22 days)
Pharmacokinetic Parameter of Maximum (Peak) Observed Serum Concentration (Cmax) of MAAA-1181a Following Treatment With DS-8201a and Itraconazole - Cohort 2
Timeframe: Cycle 1: Day 1, pre-dose and end of infusion (EOI); Cycles 2 and 3: Day 1, pre-dose, EOI, 2 hours, 4 hours, 7 hours; Day 2, 4, 8, 12, 17, and 22; Cycles 4, 6 and 8: Day 1, pre-dose and EOI (each cycle is 22 days)
Pharmacokinetic Parameter of Area Under the Serum Concentration-time Curve Following Treatment With DS-8201a and Itraconazole - Cohort 2
Timeframe: Cycle 1: Day 1, pre-dose and end of infusion (EOI); Cycles 2 and 3: Day 1, pre-dose, EOI, 2 hours, 4 hours, 7 hours; Day 2, 4, 8, 12, 17, and 22; Cycles 4, 6 and 8: Day 1, pre-dose and EOI (each cycle is 22 days)
Pharmacokinetic Parameter of Area Under the Serum Concentration-time Curve of MAAA-1181a Following Treatment With DS-8201a and Itraconazole - Cohort 2
Timeframe: Cycle 1: Day 1, pre-dose and end of infusion (EOI); Cycles 2 and 3: Day 1, pre-dose, EOI, 2 hours, 4 hours, 7 hours; Day 2, 4, 8, 12, 17, and 22; Cycles 4, 6 and 8: Day 1, pre-dose and EOI (each cycle is 22 days)