Clinical trial Recruiting at 33 sites Phase1; Phase2 Interventional Ages 18 to 100

Treatment for advanced HR+/HER2- breast cancer and other solid tumors

Official title: An Open-label, Multi-center, Phase I/II Study of ECI830 as a Single Agent and in Combination With Ribociclib and Endocrine Therapy in Patients With Advanced Hormone Receptor Positive, HER2-negative Breast Cancer and Advanced Solid Tumors

Run by Novartis · NCT06726148 · Data updated 2026-11-12

This study is testing a new treatment called ECI830, alone and with other medications, to see if it helps people with advanced hormone receptor-positive breast cancer and certain other solid tumors.

Quick facts

PhasePhase1; Phase2
Study typeInterventional
Ages18 Years to 100 Years
SexAll
Enrollment280 (estimated)
SponsorNovartis
Industry-sponsored
Locations33 sites (Los Angeles, California and 32 other locations)
StatusRecruiting
StartedApril 3, 2025
Main results expectedSeptember 25, 2028
Study endsSeptember 25, 2028
Registry record updatedAugust 27, 2026
Trial IDNCT06726148 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates include adults aged 18 and older with advanced HR+/HER2- breast cancer or solid tumors with CCNE1 amplification who have experienced disease progression after prior therapies.

Probably not a fit

Patients who have not progressed on prior hormone-based therapies or those with other types of breast cancer not meeting the eligibility criteria may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This clinical trial evaluates the safety and effectiveness of ECI830, both as a standalone treatment and in combination with ribociclib and fulvestrant, for patients with advanced hormone receptor-positive and HER2-negative breast cancer, as well as other solid tumors with CCNE1 amplification. The study is divided into two phases: the first phase focuses on determining the optimal dosage and safety profile of ECI830, while the second phase assesses its anti-tumor activity in combination with other therapies. The trial is open-label and multi-center, allowing for a diverse patient population.

Why it matters

Potential benefit: If successful, this treatment could provide a new therapeutic option for patients with advanced breast cancer and other solid tumors, potentially improving outcomes.

How similar studies have gone: Other studies have shown promise with similar combination therapies in advanced breast cancer, suggesting potential for success in this approach.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

Age ≥ 18 years old.

Patients with one of the following indications:

Phase I:

HR+/HER2- aBC with disease progression on or following at least one line of hormone-based therapy in combination with a CDK4/6i and at least one additional line of systemic therapy for metastatic disease.

Histologically and/or cytologically confirmed diagnosis of locally advanced or metastatic cancer with a CCNE1 amplification. For dose expansion only: no more than 3 prior lines of therapy for advanced or metastatic disease.

Patients with ES-SCLC and disease progression on or after standard of care (SoC). For dose expansion only: no more than 2 prior lines of therapy for advanced or metastatic disease are allowed.

Phase II:

HR+/HER2- aBC with disease progression on an aromatase inhibitor or tamoxifen in combination with a CDK4/6 inhibitor for unresectable/metastatic disease with no more than 2 lines of endocrine therapy.

Measurable disease as determined by RECIST v1.1.

BC only: If no measurable disease is present, then at least one predominantly lytic bone lesion must be present that can be accurately assessed at baseline and is suitable for repeated assessment.

Exclusion Criteria:

Previous treatment with a CDK2 inhibitor at any time.

Patients with inadequate bone marrow and/or organ functions with out-of-range laboratory values.

Clinically significant, uncontrolled heart disease and/or cardiac repolarization abnormality including MI, CABG, long QT syndrome, or risk factors for TdP.

Presence of symptomatic CNS metastases or CNS metastases that require local therapy or increasing doses of corticosteroids within 2 weeks prior to study entry.

For the combination treatment:

Patients with symptomatic visceral disease or any disease burden that makes the patient ineligible for endocrine-based therapy.

Patients who could not tolerate the prescribed dose of ribociclib during a previous course of treatment, requiring dose reduction or permanent discontinuation due to adverse events.

For patients with BC: Patient is concurrently using hormone replacement therapy.

WOCBP who are unwilling to use highly effective contraception methods, pregnant or nursing women.

Other protocol-defined inclusion/exclusion criteria may apply.

Where it's running

  • University of California LA
    Los Angeles, California, United States
    Recruiting
  • Florida Cancer Specialists
    Fort Myers, Florida, United States
    Recruiting
  • Dana Farber Cancer Institute
    Boston, Massachusetts, United States
    Recruiting
  • WA Uni School Of Med
    St Louis, Missouri, United States
    Recruiting
  • Memorial Sloan Kettering
    New York, New York, United States
    Recruiting
  • SCRI Oncology Partners
    Nashville, Tennessee, United States
    Recruiting
Show 27 more locations
  • MD Anderson Cancer Center Uni of Te
    Houston, Texas, United States
    Recruiting
  • Fred Hutch Cancer Research
    Seattle, Washington, United States
    Recruiting
  • Novartis Investigative Site
    Clayton, Victoria, Australia
    Recruiting
  • Novartis Investigative Site
    Melbourne, Victoria, Australia
    Recruiting
  • Novartis Investigative Site
    Toronto, Ontario, Canada
    Recruiting
  • Novartis Investigative Site
    Montreal, Quebec, Canada
    Recruiting
  • Novartis Investigative Site
    Nanjing, Jiangsu, China
    Recruiting
  • Novartis Investigative Site
    Xian, Shanxi, China
    Recruiting
  • Novartis Investigative Site
    Brno, Czechia
    Recruiting
  • Novartis Investigative Site
    Copenhagen, Denmark
    Recruiting
  • Novartis Investigative Site
    Odense C, Denmark
    Recruiting
  • Novartis Investigative Site
    Bordeaux, France
    Recruiting
  • Novartis Investigative Site
    Saint-Herblain, France
    Recruiting
  • Novartis Investigative Site
    Freiburg im Breisgau, Baden-Wurttemberg, Germany
    Recruiting
  • Novartis Investigative Site
    Heidelberg, Germany
    Recruiting
  • Novartis Investigative Site
    Ulm, Germany
    Recruiting
  • Novartis Investigative Site
    Haifa, Israel
    Recruiting
  • Novartis Investigative Site
    Tel Aviv, Israel
    Recruiting
  • Novartis Investigative Site
    Milan, Mi, Italy
    Recruiting
  • Novartis Investigative Site
    Modena, Mo, Italy
    Recruiting
  • Novartis Investigative Site
    Chuo Ku, Tokyo, Japan
    Recruiting
  • Novartis Investigative Site
    Singapore, Singapore
    Recruiting
  • Novartis Investigative Site
    Seoul, Seoul, South Korea
    Recruiting
  • Novartis Investigative Site
    Barcelona, Spain
    Recruiting
  • Novartis Investigative Site
    Barcelona, Spain
    Recruiting
  • Novartis Investigative Site
    Tainan, Taiwan
    Recruiting
  • Novartis Investigative Site
    London, Oxford, United Kingdom
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.