Purpose

This is an open-label, three-part, multiple-dose study to evaluate safety, tolerability, and efficacy of U3-1402 in patients with HER3-positive metastatic breast cancer. HER3 is a unique member of the human epidermal growth factor receptor, which defines a certain type of cancer. The number of patients and treatment cycles are not fixed in this study. Subjects who continue to derive clinical benefit from the study treatment in the absence of withdrawal of consent, progressive disease (PD), or unacceptable toxicity may continue the study treatment until the end of the trial.

Condition

Eligibility

Eligible Ages
Over 18 Years
Eligible Genders
All
Accepts Healthy Volunteers
No

Inclusion Criteria

  1. Is 18 Years and older in the United States or 20 Years and older in Japan
  2. Has a pathologically documented advanced/unresectable or metastatic breast cancer
  3. Documented HER3-positive disease measured by immunohistochemistry (IHC)
  4. Has disease that is refractory to or intolerable with standard treatment, or for which standard treatment no longer is available
  5. Has an Eastern Cooperative Oncology Group Performance Status 0-1
  6. Has Left Ventricular Ejection Fraction ≥ 50%
  7. Has measurable disease based on Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1

Additional Inclusion Criteria for Dose Finding Part and Dose Expansion Part:

8. Has received 2-6 prior chemotherapy regimens for breast cancer, at least 2 of which were administered for treatment of advanced/unresectable or metastatic disease. At least 1 prior chemotherapeutic regimen must have included a taxane, administered in the neoadjuvant, adjuvant, or advanced setting.

Additional Inclusion Criteria for Dose Expansion Part Only:

9. Is able to submit a fresh tumor biopsy sample prior to starting study treatment if not already submitted for HER3 expression

10. Has documented HER2 negative expression according to American Society of Clinical Oncology - College of American Pathologists (ASCO-CAP) guidelines

11. Has documented hormone (estrogen and/or progesterone) receptor (HR)-positive disease

Exclusion Criteria

  1. Prior treatment with a HER3 antibody
  2. Prior treatment with an antibody-drug conjugate (ADC) which consists of an exatecan derivative that is a topoisomerase I inhibitor (eg, DS-8201)
  3. Has a medical history of symptomatic congestive heart failure (New York Heart Association classes II-IV) or serious cardiac arrhythmia requiring treatment
  4. Has a medical history of myocardial infarction or unstable angina
  5. Has a corrected QT prolongation to > 450 millisecond (ms) in males and > 470 ms in females
  6. Has a medical history of clinically significant lung diseases (eg, interstitial pneumonia, pneumonitis, pulmonary fibrosis, and severe radiation pneumonitis) or who are suspected to have these diseases by imaging at screening period
  7. Has clinically significant corneal disease

Study Design

Phase
Phase 1/Phase 2
Study Type
Interventional
Allocation
Randomized
Intervention Model
Single Group Assignment
Primary Purpose
Treatment
Masking
None (Open Label)

Arm Groups

ArmDescriptionAssigned Intervention
Experimental
Dose Escalation Part
Participants receive U3-1402 from 1.6 mg/kg to 9.6 mg/kg, administered via intravenous (IV) solution at 3-week intervals.
  • Drug: U3-1402
    U3-1402 consists of an antibody component (patritumab, U3-1287) covalently conjugated to a drug-linker (MAAA-1162a) containing a drug component (MAAA-1181a)
Experimental
Dose Finding Part
Participants receive 1 of 5 different U3-1402 dosing regimens, administered via IV solution at 2 or 3-week intervals at doses at or lower than those studied in the Dose Escalation Part.
  • Drug: U3-1402
    U3-1402 consists of an antibody component (patritumab, U3-1287) covalently conjugated to a drug-linker (MAAA-1162a) containing a drug component (MAAA-1181a)
Experimental
Dose Expansion Part
Participants with HER3 high status receive 4.8 mg/kg or 6.4 mg/kg of U3-1402 administered via intravenous (IV) solution at 3-week intervals. Participants with HER3 low status receive 6.4 mg/kg of U3-1402 administered via intravenous (IV) solution at 3-week intervals.
  • Drug: U3-1402
    U3-1402 consists of an antibody component (patritumab, U3-1287) covalently conjugated to a drug-linker (MAAA-1162a) containing a drug component (MAAA-1181a)

Recruiting Locations

Mays Cancer Center
San Antonio, Texas 78229
Contact:
Study Coordinator
210-450-5816
meekins@uthscsa.edu

More Details

NCT ID
NCT02980341
Status
Recruiting
Sponsor
Daiichi Sankyo Co., Ltd.

Study Contact

Daiichi Sankyo Contact for Clinical Trial Information
+81-3-6225-1111(M-F 9-5 JST)
dsclinicaltrial@daiichisankyo.co.jp

Notice

Study information shown on this site is derived from ClinicalTrials.gov (a public registry operated by the National Institutes of Health). The listing of studies provided is not certain to be all studies for which you might be eligible. Furthermore, study eligibility requirements can be difficult to understand and may change over time, so it is wise to speak with your medical care provider and individual research study teams when making decisions related to participation.