Trial of Trastuzumab Deruxtecan in Previously Treated HER2

Recruiting now · Phase 2 · Has a placebo group

Conditions studied: Breast Cancer Metastatic

In brief

The purpose of this study is to test the good and bad effects of a drug called trastuzumab deruxtecan (T-DXd) in adult patients with metastatic HER2-negative breast cancer and which patients might benefit the most from T-DXd.

Key facts

Study ID

NCT06750484

Run by

Yale University

People needed

40

Starts

2025-06-20

Expected to finish

2028-12-31

Last updated by the study team

2026-06-29

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Must be competent and able to comprehend, sign, and date an Institutional Review Board (IRB) approved ICF before performance of any study-specific procedures or tests.
• Men or women ≥18 years old.
• Pathologically documented breast cancer that is unresectable or metastatic.
• 4.Tumor biopsies have always shown HER2-IHC 0 (<10% membrane staining, including 0 null and 0 ultralow) in all prior biopsies and never previously HER2-positive (IHC 3+ or ISH+) or HER2-low (1+, or 2+ ISH-) on prior pathology testing according to American Society of Clinical Oncology College of American Pathologists (ASCO-CAP) guidelines.
• Either HR-positive or HR-negative status of the tumor per ASCO-CAP guidelines are allowed.
• Patients with HR-positive disease must have progressed or be intolerant to CDK 4/6 inhibitors plus endocrine therapy, and patients with HR-negative disease must have received 1 line of therapy in the metastatic setting (progression on or within 6 months of neoadjuvant or adjuvant therapy will be accounted for as 1 line of prior therapy). There is no limit on number of subsequent lines of therapy for study entry. .
• Patients must have never been previously treated with any anti-HER2 therapy, including prior trastuzumab deruxtecan, other HER2-directed ADCs, HER2 antibodies or HER2 tyrosine kinase inhibitors
• Clinical or radiologic progression (during or after most recent treatment) or intolerance to therapy prior to enrollment in this trial
• Adequate archival tumor sample <3 years-old available for assessment of HER2 status by IHC and by HS-HER2 quantitative assay. If archival tissue is not available or inadequate for assessment (e.g. decalcified bone, cytology, or other), a newly obtained biopsy from a metastatic site (or breast tissue if locally advanced/unresectable disease as the only site of advanced disease) is required on enrolment.
• Presence of at least 1 measurable lesion based on Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1.
• ECOG PS ≤ 2.
• Left ventricular ejection fraction (LVEF) ≥50% within 28 days prior to C1D1.
• Adequate bone marrow function (Table 1) within 28 days before C1D1, defined as:
• Platelet count >≥100,000/mm3 (Platelet transfusion is not allowed within 1 week prior to Screening assessment).
• Hemoglobin level ≥9.0 g/dL (red blood cell transfusion is not allowed within 1 week prior to Screening assessment).
• Absolute neutrophil count ≥1500/mm3 (granulocyte colony-stimulating factor administration is not allowed within 1 week prior to Screening assessment).
• Adequate renal function (Table 1) within 28 days before C1D1, defined as:
• a. Creatinine clearance ≥30 mL/min, as calculated using the Cockcroft-Gault Equation.
• Adequate hepatic function (Table 1) within 28 days before C1D1, defined as:
• Aspartate aminotransferase (AST)/alanine aminotransferase (ALT) ≤ 3×ULN (< 5×ULN in participants with liver metastases).
• Total bilirubin ≤1.5 × ULN if no liver metastases or <3 × ULN in the presence of documented Gilbert's syndrome (unconjugated hyperbilirubinemia) or liver metastases at baseline.
• Adequate blood clotting function( defined below) within 28 days before C1D1, defined as International normalized ratio or Prothrombin time and either partial thromboplastin or activated partial thromboplastin time ≤ 1.5 × ULN.
• Platelet function greater than or equal to 100000/mm3 (Platelet transfusion is not allowed within 1 week prior to C1D1).
• Hemoglobin greater than or equal to 9.0 g/dL NOTE: Participants requiring ongoing transfusions or growth factor support to maintain haemoglobin ≥9.0 g/dL are not eligible. Red blood cell transfusion is not allowed within 1 week prior to C1D1.
• Absolute neutrophil count greater than or equal to 1500/mm3. (granulocyte-colony stimulating factor administration is not allowed within 1 week prior to C1D1).

You may not qualify if…

• Uncontrolled or significant cardiovascular disease, including any of the following:
• History of myocardial infarction within 6 months before enrolment.
• History of symptomatic congestive heart failure (New York Heart Association Class II to IV).
• Corrected QT interval (QTc) Fridericia prolongation to >470 ms (females) or >450 ms (male) based on average of Screening 12 lead ECG.
• Uncontrolled or significant respiratory disease criteria, including any of the following:
• Has a history of (noninfectious) ILD/pneumonitis that required steroids, has current ILD/pneumonitis, or where suspected ILD/pneumonitis cannot be ruled out by imaging at Screening.
• Lung-specific intercurrent clinically significant illnesses including, but not limited to, any underlying pulmonary disorder (e.g. severe asthma, severe chronic obstructive pulmonary disorder, restrictive lung disease, symptomatic, recurrent and uncontrolled pleural effusion etc.)
• Any autoimmune, connective tissue or inflammatory disorders, including Rheumatoid arthritis, Sjogren's, and sarcoidosis, where there is documented, or a suspicion of pulmonary involvement at the time of screening. Full details of the disorder should be recorded in the eCRF for participants who are included in the study.
• Prior pneumonectomy (complete)
• Has spinal cord compression or clinically active central nervous system metastases, defined as untreated and symptomatic, or requiring therapy with corticosteroids to control associated symptoms.
• Subjects with clinically inactive brain metastases may be included in the study.
• Subjects with treated brain metastases that are no longer symptomatic and who require no treatment with corticosteroids may be included in the study if they have recovered from the acute toxic effect of radiotherapy. A minimum of 2 weeks must have elapsed between the end of whole brain radiotherapy and study enrolment.
• Has history of another primary malignancy, except for:
• Malignancy treated with curative intent and with no known active disease ≥5 years before the first dose of IP and of low potential risk for recurrence.
• Adequately treated non-melanoma skin cancer or lentigo maligna without evidence of disease.
• Adequately treated carcinoma in situ without evidence of disease.
• Has a history of severe hypersensitivity reactions to either the drug substances or inactive ingredients in the drug product, or history of severe hypersensitivity reactions to monoclonal antibodies.
• Has an uncontrolled infection requiring ongoing IV antibiotics, IV antivirals, or IV antifungals.
• Has known history of human immunodeficiency virus (HIV) infection with detectable viral load or CD4 count < 200 cells per cubic millimeter or active hepatitis B ( HBsAg positive) or C (HCV positive RNA) infection.
• Substance abuse, medical conditions such as clinically significant cardiac or pulmonary diseases or psychological, social, familial, or geographical conditions, that would, in the opinion of the Investigators, increase the safety risk to the subject or interfere with the subject's participation in the clinical study or evaluation of the clinical study results.
• Has unresolved toxicities from previous anticancer therapy, defined as toxicities (other than alopecia) not yet resolved to Grade ≤1 or baseline. Subjects with chronic Grade 2 toxicities may be eligible per the discretion of the Investigator [e.g., Grade 2 chemotherapy-induced neuropathy, fatigue, residual endocrinopathies from use of immunotherapy such as hypothyroidism/hyperthyroidism, type 1 diabetes, hyperglycemia, adrenal insufficiency, adrenalitis, skin hypopigmentation (vitiligo)].
• Is pregnant or breastfeeding, or planning to become pregnant.
• Receipt of live, attenuated vaccine (mRNA and replication deficient adenoviral vaccines are not considered attenuated live vaccines) within 30 days prior to the first exposure to study intervention. Note: Participants, if enrolled, should not receive live vaccine during the study and up to 30 days after the last dose of study intervention.
• Otherwise considered inappropriate for the study by the Investigator.

Where it is running

• Yale University — New Haven, Connecticut, United States (enrolling)
• Emory Winship Cancer Institute — Atlanta, Georgia, United States (enrolling)
• University of Rochester Medical Center — Rochester, New York, United States (enrolling)

Full record on ClinicalTrials.gov

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