Phase 2 Study of HER3-DXd Drug for Adults With Locally Advanced or Metastatic Solid Tumors Including Melanoma, Head and Neck, Gastric, Ovarian, Cervical, Endometrial, Bladder, Esophageal, Pancreatic, Prostate, Lung, and Breast Cancers

What this Trial Is About

This research aims to evaluate HER3-DXd monotherapy in adults with locally advanced unresectable or metastatic solid tumors who have previously received at least one systemic anticancer therapy. The study includes participants with various cancers such as melanoma, head and neck squamous cell carcinoma, HER2-negative gastric cancer, ovarian carcinoma, cervical cancer, endometrial cancer, bladder cancer, esophageal carcinoma, pancreatic carcinoma, prostate cancer, lung cancer, and breast cancer. The focus is to assess the treatments safety, tolerability, efficacy, and pharmacokinetics, along with exploring the relationship between HER3 protein expression and treatment response. Participants will receive intravenous infusions of HER3-DXd at a dose of 5.6 mgkg every three weeks Q3W. The trial is designed as a phase 2, multicenter, multicohort, open-label study involving a single treatment group receiving HER3-DXd monotherapy. Treatment continues until disease progression, unacceptable side effects, or withdrawal. The study will also collect tumor tissue samples before treatment to analyze HER3 protein expression. During the study, participants will undergo regular assessments including imaging scans to evaluate tumor response, safety evaluations, laboratory tests, and pharmacokinetic sampling at specified cycles. The primary outcomes include measuring objective response rates and, for prostate cancer participants, the proportion achieving significant decreases in PSA levels. Secondary outcomes cover treatment-emergent adverse events, duration of response, clinical benefit, disease control, progression-free survival, overall survival, and pharmacokinetic parameters. Participants will be followed for up to approximately 27 months to monitor these outcomes.

A Study of HER3-DXd in Subjects With Locally Advanced or Metastatic Solid Tumors