The participants of this study will have advanced malignancies (also known as advanced cancer). The main aim of this trial will be to study the blood levels (known as pharmacokinetics) of the tazemtostat (the study drug) when administered in combination with another drug. Part 1 of the study will evaluate the interaction between the drugs tazemetostat and itraconazole. Part 2 of the study will evaluate the interaction between the drugs tazemetostat and rifampin For both Parts 1 and 2, safety and the level that effects of the study drug can be tolerated (known as tolerability) will be assessed throughout.
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Part 1: Area Under the Plasma Concentration-Time Curve From Time 0 to 12 Hours of Quantifiable Concentration (AUC0-12h) of Tazemetostat
Timeframe: Pre-dose (0 hour), 0.5, 1, 1.5, 2, 4, 6, 8, and 12 hours post-dose on Cycle 1 Day 1 and Cycle 1 Day 15
Part 1: Maximum Observed Plasma Concentration (Cmax) of Tazemetostat
Timeframe: Pre-dose (0 hour), 0.5, 1, 1.5, 2, 4, 6, 8, 12, 36, 48, and 72 hours post-dose on Cycle 1 Day 1 and Cycle 1 Day 15
Part 2: AUC0-12h of Tazemetostat
Timeframe: Pre-dose (0 hour), 0.5, 1, 1.5, 2, 4, 6, 8, 12 hours post-dose on Cycle 1 Day 1 and Cycle 1 Day 15
Part 2: Cmax of Tazemetostat
Timeframe: Pre-dose (0 hour), 0.5, 1, 1.5, 2, 4, 6, 8, 12, 24, 36, and 48 hours post-dose on Cycle 1 Day 1 and Cycle 1 Day 15