Cohort 1:
Cohort 1 is a 2-period, 2-sequence, crossover study designed to assess the effect of food on the PK of tesetaxel and tesetaxel metabolites. Patients were randomized in a 1:2 ratio to receive tesetaxel on Day 1 of two 21-day cycles under fed and fasting conditions in one of two opposing sequences (Sequence 1A and Sequence 1B).
Cohort 2:
Cohort 2 is a 2-period, single-sequence, crossover study designed to assess the potential PK drug-drug interaction (DDI) of a strong CYP3A inhibitor (itraconazole) on tesetaxel and tesetaxel metabolites. Patients receive tesetaxel during Cycle 1 followed by a reduced dose of tesetaxel plus itraconazole during Cycle 2.
Cohort 3:
Cohort 3 is a 2-period, single-sequence, crossover study designed to assess the potential PK DDI of a strong CYP3A inducer (rifampin) on tesetaxel and tesetaxel metabolites. Patients receive tesetaxel during Cycle 1 followed by tesetaxel plus rifampin during Cycle 2.
Patients in all cohorts also participate in a study designed to assess the effect of tesetaxel and tesetaxel metabolites on cardiac repolarization as measured by the change from baseline in the QTc interval over the first cycle of treatment. Patients who are tolerating and benefitting from treatment with tesetaxel have the opportunity to continue onto an optional treatment extension.
