Clinical trial · Interventional
Study of Antibody Drug Conjugate in Patients With Advanced Breast Cancer Expressing HER2
A Phase 1b, First-in-Human, Dose Escalation and Expansion Study of XMT-1522 in Patients With Advanced Breast Cancer and Other Advanced Tumors Expressing HER2
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 8, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260908-000001
Summary
Brief summary (as posted)
This Phase 1b trial is an open label, multi-center study of XMT-1522 administered as an intravenous infusion once every three weeks. The dose escalation part of the study will establish the maximum tolerated dose or recommended Phase 2 dose for in patients with advanced breast cancer and either a HER2 immunohistochemistry (IHC) score of at least 1+ using a validated IHC assay or with evidence of HER2 amplification. Patients with HER2 positive (by IHC or amplification) gastric cancer or nonsmall cell lung cancer may also be eligible for participation in dose escalation. Upon completion of dose escalation, the cohort expansion segment of the study will consist of four parallel cohorts of different patients groups to confirm the maximum tolerated dose or the recommended Phase 2 dose and estimate the objective response in each of the patient populations.
Conditions
Conditions (3)
Free-text conditions as registered, with the CancerIndex entity they were reconciled to and the match type.
| Condition (as posted) | Mapped entity | Match | Confidence |
|---|---|---|---|
| Advanced Breast Cancer | Malignant Breast Neoplasm | CURATED_BROADER | 0.78 |
| Advanced Gastric Cancer | Malignant Gastric Neoplasm | CURATED_BROADER | 0.80 |
| Advanced Nonsmall Cell Lung Cancer | Lung Non-Small Cell Carcinoma | CURATED_BROADER | 0.78 |
Interventions
Interventions (1)
| Intervention | Type | Mapped drug | Match |
|---|---|---|---|
| XMT-1522 | Drug | — | UNRESOLVED |
Design
Arms and outcomes
Arms (1)
- type
- EXPERIMENTAL
- label
- Dose Escalation and Confirmation
- description
- XMT-1522 treatment will administered in groups of patients who will receive doses that increase over time. Once the maximum tolerated dose or recommended Phase 2 dose is achieved, new groups of patients will receive XMT-1522 at this fixed dose.
- interventionNames
- Drug: XMT-1522
Primary outcomes (1)
- measure
- Maximum tolerated dose or recommended Phase 2 dose
- timeFrame
- Up to 14 weeks, from the date of first dose until unacceptable side effects or a dose-limiting toxicity is met.
- description
- Evaluate adverse events and use of concomitant medication use after XMT-1522 doses
Secondary outcomes (5)
- measure
- Time of maximum observed concentration of XMT-1522
Eligibility
Eligibility (as posted)
- Sex
- All
- Minimum age
- 18 Years
Show eligibility criteria text
Inclusion Criteria: * Able and willing to give informed consent * Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 * Measurable disease via RECIST * Resolution of all toxic side effects from prior oncology treatments * Adequate organ function as measured by various blood parameters * Not pregnant or lactating, willing to prevent pregnancy while on study and for 6 months after the last dose of XMT-1522 * Histologically or cytologically confirmed adenocarcinoma of the breast with unresectable locally advanced disease, or metastatic disease and HER2 IHC 1+ or 2+ OR * Histologically or cytologically confirmed adenocarcinoma of the breast with unresectable locally advanced disease, or metastatic disease and HER2 IHC 3+ or positive for HER2 gene amplification * Progressed following all standard of care therapies for advanced breast cancer. OR * Histologically or cytologically confirmed locally advanced or metastatic gastric cancer and HER2 IHC 3+ or positive for HER2 gene amplification OR * Histologically or cytologically confirmed Stage IIIb or IV non-small cell lung cancer HER2 IHC 2+ or 3+ by local laboratory assessment. Exclusion Criteria: * Major surgery, radiation therapy, or systemic anti-cancer therapy within 28 days of starting study treatment. * Some types of brain metastases * Peripheral neuropathy of Grade 2 within 3 weeks prior to the first study therapy * History of exposure to cumulative doxorubicin dose ≥ 360 mg/meter squared. If another anthracycline or more than one anthracycline has been used, then the cumulative dose must not exceed the equivalent of 360 mg/meter squared of doxorubicin * History of clinically significant cardiac dysfunction * Current known active infection with HIV, hepatitis B virus, or hepatitis C virus * Current severe, uncontrolled systemic disease * Severe dyspnea at rest, due to complications of advanced malignancy, or requiring supplementary oxygen therapy. * History of other malignancy within the last 5 years, except for appropriately treated carcinoma in situ of the cervix, non-melanoma skin carcinoma, or other malignancy with a similar expected curative outcome Patients who participate in the dose escalation segment of the study cannot participate in the expansion segment of the study.
References
Publications (0)
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