Study of IEV407 for Advanced HR+/HER2- Breast Cancer

This study is testing a new medication called IEV407, given by mouth, for people with advanced hormone receptor-positive (HR+), HER2-negative (HER2-) breast cancer. Researchers want to see how safe IEV407 is, how well people tolerate it, and if it shows early signs of helping to treat the cancer. IEV407 will be given alone or in combination with approved medications, fulvestrant (an injection) or letrozole (a pill). You may be eligible if you are at least 18 years old and your cancer has progressed after certain previous treatments. The study will measure side effects and how often doses need to be changed or stopped to understand the safety of the treatment.

Study design
This is a first-in-human, open-label study, meaning both you and your doctors will know which treatment you are receiving. It will involve approximately 194 participants and includes a dose escalation and expansion part.
What's involved
Not specified in the trial record.
Compensation
Not stated in the trial record.
Follow-up
Your safety will be monitored for up to approximately 2 years after starting the study.

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NCT07604571

Study of IEV407 as Single Agent or in Combination in Patients With Advanced HR+/HER2- Breast Cancer

Recruiting
PHASE1Ages 18+InterventionalTreatment
Novartis Pharmaceuticals
~194 participants
Updated 2026-08-27 on ClinicalTrials.gov
What's tested:IEV407FulvestrantLetrozole

At a glance

Recruiting sites
5 of 5 listed sites are recruiting right now
RecruitingSuspended, closed, or not yet open
What they're measuring
Incidence and severity of dose-limiting toxicities (DLTs)
Measured over 28 days
+3 more outcomes measured
Advanced HR+/HER2- Breast Cancer
5 sites across 5 states
Connecticut1
Texas1
Ontario1
Osaka1
Singapore1

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Eligibility criteria

Inclusion

Age ≥ 18 years old
Patients with one of the following indications:
Dose escalation (IEV407 single agent and in combination with fulvestrant or letrozole):

Exclusion

Patients with inadequate bone marrow and/or organ functions with out-of-range laboratory values.
Impaired cardiac function or clinically significant cardiac disease.
Concurrent use of hormone replacement therapy.
Women of childbearing potential who are unwilling to use highly effective contraception methods, pregnant or nursing women.
For the combination treatment of IEV407 with fulvestrant or letrozole: Patients with symptomatic visceral disease or any disease burden that makes the patient ineligible for endocrine-based therapy.
  • Incidence and severity of dose-limiting toxicities (DLTs)28 days

    Number of participants with DLTs. A DLT is defined as an adverse event or abnormal laboratory value of Common Terminology Criteria for Adverse Events (CTCAE) grade 3 or higher, including death, unless clearly and incontrovertibly assessed as due to disease, disease progression, inter-current illness/injury, concomitant medications, or extraneous causes, that occurs within the first 28 days of treatment with IEV407 in the dose escalation parts or in the expansion part of IEV407 in combination with fulvestrant with the exceptions described in the study protocol.

  • Incidence and severity of Adverse Events (AEs) and Serious Adverse Events (SAEs)Up to approximately 2 years

    Number of participants with AEs and SAEs, including changes in laboratory values, vital signs and echocardiograms (ECGs) qualifying and reported as AEs.

  • Frequency of dose interruptions, reductions and discontinuationsUp to approximately 2 years

    Number of participants with dose adjustments (interruptions, reductions, or permanent discontinuation) as a measure of tolerability.

  • Dose intensityUp to approximately 2 years

    Dose intensity defined as the ratio of actual cumulative dose received and actual duration of exposure.