Phase 1 multicenter, open-label study to establish the maximum tolerated dose (MTD) of two administration schedules of E7389 (eribulin) liposomal formulation in patients (pts) with solid tumors.

2524Background: Eribulin, a microtubule dynamics inhibitor, is approved in the US for the treatment of pts with metastatic breast cancer who have previously received ≥ 2 chemotherapeutic regimens for metastatic disease including an anthracycline and a taxane in the adjuvant/metastatic setting. Preclinical evidence suggested improved efficacy and lower toxicity with a liposomal formulation of eribulin (eribulin-LF). The primary objective of this study was to determine the MTD and dosing schedule for eribulin-LF. Secondary objectives included determining safety, pharmacokinetics (PK), and efficacy. Methods: Using a conventional 3 + 3 study design, eligible pts received escalating doses (1.0 to 3.5 mg/m2) of eribulin-LF (60-min, i.v. infusion) on day (D) 1 of a 21-day cycle (schedule [S] 1) or on D1 and D15 of a 28-day cycle (S2). An expansion phase confirmed the safety of eribulin-LF in pts with endometrial, ovarian, or HER2-negative breast cancer. Results: Of 58 pts (S1: n = 20; S2: n = 38): 65% were femal...