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

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Novartis

Status and phase

Enrolling
Phase 1

Conditions

Advanced HR+/HER2- Breast Cancer

Treatments

Drug: Letrozole
Drug: IEV407
Drug: Fulvestrant

Study type

Interventional

Funder types

Industry

Identifiers

NCT07604571
2025-522707-26 (Registry Identifier)
CIEV407A12101
2025

Details and patient eligibility

About

The purpose of this study is to evaluate the safety, tolerability and preliminary activity of IEV407 as a single agent and in combination with endocrine therapy (fulvestrant or letrozole) in patients with advanced hormone receptor positive (HR+), human epidermal growth factor receptor 2 negative (HER2-negative) breast cancer.

Full description

This is a first-in-human, open-label, phase I/Ib, multi-center study consisting of a dose escalation part of IEV407 as a single agent (SA) and in combination with endocrine therapy (fulvestrant or letrozole) followed by a dose expansion part in patients with advanced breast cancer (aBC). The study will start with the evaluation of IEV407 as a SA.

Following evaluation of IEV407 in combination with fulvestrant through dose escalation and establishment of a recommended dose and/or dose ranges for optimization (RD/DRO), the study may proceed to the Phase Ib expansion part to evaluate the combination treatment of IEV407 with fulvestrant. If more than one treatment arm is open concurrently in the dose expansion part, a randomization schedule will be employed for patient allocation.

Enrollment

194 estimated patients

Sex

All

Ages

18 to 100 years old

Volunteers

No Healthy Volunteers

Inclusion criteria

  • Age ≥ 18 years old

  • Patients with one of the following indications:

    • Dose escalation (IEV407 single agent and in combination with fulvestrant or letrozole):

HR+/HER2- aBC with disease progression on or following, or have been intolerant to, at least one line of endocrine-based therapy in combination with a CDK4/6 inhibitor and at least one additional line of systemic therapy in the unresectable/metastatic setting and not be a candidate for any available standard therapy, in the investigator's judgement.

- Dose expansion of IEV407 in combination with fulvestrant: HR+/HER2- aBC with disease progression on or following, or have been intolerant to, endocrine-based therapy in combination with a CDK4/6 inhibitor. They must not have received more than two prior lines of endocrine-based therapy in the unresectable/metastatic setting. Prior cytotoxic chemotherapy and/or antibody-drug conjugate therapies in the unresectable/metastatic setting are not allowed.

Exclusion criteria

  • 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.

Other protocol-defined inclusion/exclusion criteria may apply.

Trial design

Primary purpose

Treatment

Allocation

Randomized

Interventional model

Sequential Assignment

Masking

None (Open label)

194 participants in 5 patient groups

Dose escalation: IEV407 single agent
Experimental group
Description:
IEV407 single agent
Treatment:
Drug: IEV407
Dose escalation: IEV407 + fulvestrant
Experimental group
Description:
IEV407 in combination with fulvestrant
Treatment:
Drug: Fulvestrant
Drug: IEV407
Dose escalation: IEV407 + letrozole
Experimental group
Description:
IEV407 in combination with letrozole
Treatment:
Drug: IEV407
Drug: Letrozole
Dose expansion, recommended dose (RD)-1: IEV407 + fulvestrant
Experimental group
Description:
IEV407 in combination with fulvestrant
Treatment:
Drug: Fulvestrant
Drug: IEV407
Dose expansion, RD-2 (optional dose optimization): IEV407 + fulvestrant
Experimental group
Description:
IEV407 in combination with fulvestrant
Treatment:
Drug: Fulvestrant
Drug: IEV407

Trial contacts and locations

5

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Central trial contact

Novartis Pharmaceuticals; Novartis Pharmaceuticals

Data sourced from clinicaltrials.gov

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