Safety, Pharmacodynamics, Pharmacokinetics, and Efficacy of Tomivosertib Combined With Paclitaxel in Advanced Breast Cancer

This is a multicenter, open-label trial to evaluate the safety, pharmacodynamics (PD), pharmacokinetics (PK), and efficacy of tomivosertib in combination with paclitaxel in patients with advanced breast cancer (ABC) of any subtype. The trial will enroll up to 45 patients with an Eastern Cooperative Oncology Group (ECOG) performance status (PS) of 0, 1, or 2 with any breast cancer (BC) subtype and at least one measurable lesion, for whom standard-of-care treatments are ineffective, not tolerated or were refused. All patients will be initially treated with tomivosertib for 14 days (referred as the run-in period). Once treatment samples are obtained, weekly paclitaxel will be added to the treatment regimen. Tumor assessments will be done at screening and then periodically throughout trial treatment. Patients will continue to receive trial treatment until progressive disease, as defined according to the Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1, intolerable trial-treatment-related toxicity, consent withdrawal, or other criteria is met (defined within the trial protocol).