A Study of U3-1402 in Subjects With Metastatic Breast Cancer

• Status: Recruiting
• Trial end date: 2023-11-30
• Target enrollment: 0
• Participant gender: All

Summary

This study is to evaluate safety and efficacy of an antibody drug conjugate U3-1402 in patients with metastatic breast cancer (MBC) who have received no prior anti-HER2 therapy.

• Phase: Phase 2
• Accepts Healthy Volunteers?: No

Details

• Lead Sponsor: SCRI Development Innovations, LLC
• Collaborator: Daiichi Sankyo, Inc.
• Treatments: Patritumab deruxtecan

Criteria

Inclusion Criteria:

Patients must meet the following criteria in order to be included in the research study:

1. Written informed consent, according to local guidelines, signed and dated by the patient or by a legal guardian prior to the performance of any study-specific procedures, sampling, or analyses

2. Women and men at least 18 years-of-age at the time of signature of the informed consent form (ICF)

3. Histologically documented locally advanced or metastatic breast cancer

4. Triple-negative breast cancer patients should have received at least 1 but no more than 3 prior lines of chemotherapy in the metastatic setting

5. HR+ breast cancer patients should have received prior treatment with endocrine therapy +CDK 4/6 inhibitor. No limit to prior endocrine therapy regimens but no more than 2 prior chemotherapy regimens in the metastatic setting

6. Measurable disease per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 (bone-only disease excluded)

7. Patients who have received radiation or surgery for brain metastases are eligible if therapy was completed ≥4 weeks prior to initiation of study treatment (2 weeks for patients who received palliative radiation therapy), there is no evidence of central nervous system disease progression on a scan or mild neurologic symptoms, and there is no requirement for chronic corticosteroid therapy for the treatment of brain metastases

8. Willingness to undergo pre-treatment biopsy and on-treatment biopsies. Must have a tumor amenable to pre-treatment biopsy (unless archived tissue is available and was obtained within 2 months prior to starting treatment) and on-treatment biopsy (excludes bone lesions and previously irradiated lesions).

9. Eastern Cooperative Oncology Group (ECOG) Performance Status score of 0 or 1

10. Has adequate organ function within 7 days before the start of study treatment, defined as:

• Platelet count ≥100 × 109/L

• Hemoglobin (Hb) ≥9 g/dL (transfusion and/or growth factor support allowed)

• Absolute neutrophil count ≥1.5 × 109/L

• Prothrombin time (PT) and partial thromboplastin time (PTT) ≤1.5 × the upper limit of normal (ULN), except for patients on coumadin-derivative anticoagulants or other similar anticoagulant therapy, who must have PT-international normalized ratio (INR) within therapeutic range as deemed appropriate by the Investigator.

• Serum creatinine ≤1.5 × ULN, or creatinine clearance ≥ 50 mL/min as calculated using the modified Cockcroft-Gault equation; confirmation of creatinine clearance is only required when creatinine is >1.5 × ULN.

• AST/ALT ≤3 × ULN (if liver metastases are present, ≤5 × ULN)

• Total bilirubin ≤1.5 × ULN if no liver metastases or < 3 × ULN in the presence of documented Gilbert's syndrome or liver metastases

• Serum albumin ≥ 2.5 g/dL

11. Male patients with female partners of childbearing potential and female patients of childbearing potential are required to use two forms of acceptable contraception, including one barrier method, during their participation in the study and for at least 7 months following last dose. Male patients must also refrain from donating sperm during their participation in the study.

Exclusion Criteria:

Patients who meet any of the following criteria will be excluded from study entry:

1. Treatment with any of the following:

• Any systemic anti-cancer chemotherapy, small molecule, biologic, hormonal agent, or immune checkpoint inhibitor therapy from a previous treatment regimen or clinical study within 21 days prior to the first dose of U3-1402.

• Prior treatment with any HER3 targeting agent

• Prior treatment with an ADC that consists of an exatecan derivative that is a topoisomerase I inhibitor (e.g. DS-8201a, DS-1062a, and DS-7300a)

• Major surgery (excluding placement of vascular access) within 4 weeks of the first dose of study drug treatment

• Radiotherapy treatment to more than 30% of the bone marrow or with a wide field of radiation within 4 weeks of the first dose of study drug treatment, or palliative radiation therapy within 2 weeks of the first dose of study drug treatment

• Chloroquine /hydroxychloroquine ≤14 days prior to the first dose of study drug treatment.

2. Patients with HER2-positive breast cancer per ASCO-CAP guidelines

3. Has any hypersensitivity to drug substances or inactive ingredients in drug product.

4. Has any history of ILD (including pulmonary fibrosis or radiation pneumonitis), has clinically significant ILD, or is suspected to have such disease by imaging during screening. If imaging findings are unlikely to indicate a history of pneumonitis, then the Investigator should discuss the considerations with the Medical Monitor about potential enrollment and record the reasoning in the source documentation.

5. Clinically severe pulmonary compromise (based on Investigator's assessment) resulting from intercurrent pulmonary illnesses including, but not limited to:

1. any underlying pulmonary disorder (e.g., pulmonary emboli, severe asthma, severe chronic obstructive pulmonary disease, restrictive lung disease, pleural effusion)

2. any autoimmune, connective tissue or inflammatory disorder with pulmonary involvement (e.g., rheumatoid arthritis, Sjögren's syndrome, sarcoidosis)

OR prior pneumonectomy

6. With the exception of alopecia, any unresolved toxicities from prior therapy greater than Common Terminology Criteria for Adverse Events (CTCAE) Grade 1 or baseline at the time of starting study treatment. Note: patients with chronic Grade 2 toxicities who are asymptomatic or adequately managed with stable medication may be eligible with approval by the Medical Monitor.

7. Leptomeningeal metastases or spinal cord compression due to disease

8. Women who are pregnant, nursing, or plan to become pregnant while in the study and for at least 7 months after the last administration of study treatment

9. Men who plan to father a child while in the study and for at least 7 months after the last administration of study treatment

10. Any of the following cardiac criteria currently or within the last 6 months:

• Mean resting corrected QT interval using Fridericia's formula (QTcF) prolongation to >470 ms for females and >450 ms for males in three successive screening measurements

• Any clinically important abnormalities (as assessed by the Investigator) in rhythm, conduction, or morphology of resting electrocardiograms (ECGs), e.g., complete left bundle branch block, third-degree heart block

• Congestive heart failure (New York Heart Association ≥ Grade 2 [Appendix D])

• Any factors that increase the risk of QTc prolongation or risk of arrhythmic events such as heart failure, hypokalemia, congenital long QT syndrome, family history of long QT syndrome or unexplained sudden death under 40 years-of-age, or any concomitant medication known to prolong the QT interval

• Patients with a left ventricular ejection fraction (LVEF) <50%

11. Has known clinically significant corneal disease from prior therapies such as drug-induced keratitis

12. As judged by the Investigator, any evidence of severe or uncontrolled systemic diseases, including uncontrolled hypertension, uncontrolled diabetes mellitus, active bleeding diatheses, or active infection, including hepatitis B, hepatitis C, and human immunodeficiency virus. Screening for chronic conditions is not required.

13. Presence of other active invasive cancers other than the one treated in this study within 3 years prior to screening, except appropriately treated basal cell carcinoma of the skin, in situ carcinoma of uterine cervix, or other local tumors considered cured by local treatment

14. Psychological, familial, sociological, or geographical conditions that do not permit compliance with the protocol and/or follow-up procedures outlined in the protocol.