HERTHENA-Breast-01: A Phase 1b/2, Multicenter, Open-label, Dose-Finding Study to Evaluate the Safety and Antitumor Activity of Patritumab Deruxtecan in Participants With HER2 Positive Unresectable Locally Advanced Breast Cancer or Metastatic Breast Cancer
Researchers want to learn if patritumab deruxtecan (MK-1022) can treat certain breast cancers. The breast cancers being studied are HER2 positive unresectable locally advanced or metastatic (the cancer has spread to other parts of the body). The goals of this study are to learn: * About the safety and how well people tolerate of patritumab deruxtecan * How many people have the cancer respond (get smaller or go away) to treatment
‣ The main inclusion criteria include but are not limited to the following:
⁃ Has histologically confirmed HER2+ locally advanced unresectable breast cancer or metastatic breast cancer
⁃ Human immunodeficiency virus (HIV)-infected participants must have well-controlled HIV on antiretroviral therapy (ART)
⁃ Participants who are hepatitis B surface antigen (HBsAg) positive are eligible if they have received HBV antiviral therapy for at least 4 weeks, and have undetectable hepatitis B virus (HBV) viral load before allocation
⁃ Participants with history of hepatitis C virus (HCV) infection are eligible if HCV viral load is undetectable
⁃ Eastern Cooperative Oncology Group (ECOG) performance status 0 to 1 within 7 days before start of study intervention
‣ Part 1 Arm 1:
⁃ Has received at least a minimum of 2 and a maximum of 5 prior lines of anti-HER2 therapy in the locally advanced or metastatic setting
⁃ Had disease progression on or after any previous trastuzumab deruxtecan (T-DXd) treatment
‣ Part 1 Arm 2:
• Has received no more than 5 prior lines of anti-HER2 therapy in the locally advanced or metastatic setting
‣ Part 1 Arm 3:
• Has received and had disease progression from T-DXd treatment in any setting and a maximum of 3 prior lines of anti-HER2 therapy in the locally advanced or metastatic setting. T-DXd must be the most recent therapy received before enrollment.
‣ Part 2 : Has not received prior systemic therapy (including T-DXd) for recurrent locally advanced or metastatic breast cancer (mBC).