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Metastatic Breast CancerPhase 1/2SUMIT-ELANCT05963997

A Study of Samuraciclib and Elacestrant in Participants With Metastatic or Locally Advanced HR+/HER2-negative Breast Cancer

A Phase 1/2 study testing Samuraciclib and Elacestrant Dihydrochloride in people with Metastatic Breast Cancer and Locally Advanced Breast Cancer, run by Carrick Therapeutics Limited at 23 sites in 4 countries.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

This is an international, multisite, open-label, Phase 1b/2 study, to confirm safety and efficacy of samuraciclib in combination with elacestrant in adult participants with metastatic or locally advanced Hormone Receptor (HR) positive and Human Epidermal Growth Factor Receptor (HER)2-negative breast cancer. Read more about this study

Who is it for?
Ages 18 years and older
What is being tested?
Samuraciclib and Elacestrant Dihydrochloride
Type of treatment
Pill or oral medicine
Could I receive a placebo?
No, everyone receives an active treatment
How many people
49 participants
Where
23 sitesin 4 countries
Study dates
9 Oct 2023to 6 Mar 2026
Phase
Phase 1/2
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Histologically confirmed diagnosis of ER-positive, HER2-negative locally advanced or metastatic breast cancer.
  • Documented objective disease progression while on or within 6 months after the end of the most recent therapy.
  • Received prior AI in combination with a CDK4/6i as the last therapy
  • Known TP53 and ESR1 mutation status.
  • Participants must have measurable disease or bone only disease as defined by Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1.
  • Pre/peri-menopausal participants must have commenced treatment with a luteinizing hormone-releasing hormone (LHRH) agonist at least 4 weeks prior to first dose of study intervention.
  • Eastern Cooperative Oncology Group (ECOG) performance status ≤1 with no deterioration over the past 2 weeks.
  • Expected life expectancy of >12 weeks in the judgement of the treating investigator.

Who cannot join

  • Inflammatory breast cancer.
  • Participants with any other active malignancy within 3 years prior to enrollment, except for adequately treated basal cell or squamous cell skin cancer, or carcinoma in situ of the cervix.
  • More than 1 line of endocrine treatment for locally advanced or metastatic disease treatment.
  • Inadequate hepatic, renal, and bone marrow function.
  • Clinically significant cardiovascular disease.
  • Any current or prior central nervous system metastases, carcinomatous meningitis, or leptomeningeal disease.
  • Pregnant or breastfeeding women.

Trial locations and contacts

23 sites in 4 countries.

23 sites in 4 countries

Spain10 sites
  • Site 65 - Complexo Hospitalario Universitario A Coruña

    A Coruña

  • Site 64 - Hospital Clinic de Barcelona (Hospital Clinic i Provincial)

    Barcelona

  • Site 68 -Hospital Universitario Vall d'Hebron

    Barcelona

  • Site 61 - Institut Catala d'Oncologia (ICO), Hospital Duran i Reynals Location

    L'Hospitalet de Llobregat

  • Site 62 - Universidad de Navarra, Clinica Universidad de Navarra (CUN)

    Madrid

  • Site 63 - South Texas Accelerated Research Therapeutics, CIOCC, Hospital Madrid Norte-Sanchinarro

    Madrid

  • Site 66 - Hospital Clinico San Carlos

    Madrid

  • Site 69 - Universidad de Navarra - Clinica Universidad de Navarra (CUN)

    Pamplona

  • Site 60 - NEXT Oncology EU Hospital Universitario Quiron Salud Madrid

    Pozuelo de Alarcón

  • Site 67 - Universidad de Sevilla, Hospital Universitario Virgen Macarena

    Seville

Other trials in Spain

United States5 sites
  • Site 42 - Dana-Farber Cancer Institute, EDDC

    Boston, Massachusetts, 02215

  • Site 38 - Northwestern University, Feinberg School of Medicine, Northwestern University

    Chicago, Illinois, 60611

  • Site 35 - Cleveland Clinic, Taussig Cancer Institute

    Cleveland, Ohio, 44106

  • Site 41 - The START Center for Cancer Care, South Texas Oncology and Hematology

    San Antonio, Texas, 78229

  • Site 32 - Swedish Medical Center, Swedish Cancer Institute (SCI),Cherry Hill Campus

    Seattle, Washington, 98122

Other trials in United States

France5 sites
  • Site 81 - Bergonie unicancer, Nouvelle-Aquitaine, L'Institut Bergonie

    Bordeaux

  • Site 80 - Centre Jean Bernard, Clinique Victor Hugo

    Le Mans

  • Site 83 - Institut Paoli Calmettes (IPC)

    Marseille

  • Site 85 - Institut Curie

    Paris

  • Site 82 - Institut de Cancerologie de Ouest (ICO)

    Saint-Herblain

Other trials in France

United Kingdom3 sites
  • Site 12 - Belfast City Hospital

    Belfast

  • Site 4 - The Christie NHS Foundation Trust

    Manchester

  • Site 2 - Oxford University Hospitals NHS Trust - Churchill Hospital

    Oxford, OX3 7LE

Other trials in United Kingdom

About this study

Official title: A Phase 1b/2 Open-label Study of Samuraciclib in Combination With Elacestrant in Participants With Metastatic or Locally Advanced Hormone Receptor-positive and Human Epidermal Growth Factor Receptor 2-negative Breast Cancer

This is an international, multisite, open-label, Phase 1b/2 study, to confirm safety and efficacy of samuraciclib in combination with elacestrant in adult participants with metastatic or locally advanced Hormone Receptor (HR) positive and Human Epidermal Growth Factor Receptor (HER)2-negative breast cancer.

Read the detailed description

This is a multiple cohort study, an initial dose escalation phase is designed to confirm the safe dose of samuraciclib in combination with elacestrant. A Safety Review Committee (SRC) will monitor the safety, tolerability, and PK data during this phase. Once ascertained, an expansion cohort will be opened to explore the efficacy of samuraciclib in combination with elacestrant.

Being tested
Samuraciclib, Elacestrant Dihydrochloride
Keywords
Metastatic Breast Cancer, Advanced Breast Cancer, Breast Cancer, HR Positive, HER2-Negative
Medical subject headings
Breast Neoplasms

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • SamuraciclibDrug

    Samuraciclib capsules by mouth once a day

  • Elacestrant DihydrochlorideDrug

    Also called ORSERDU

    Elacestrant tablets by mouth once a day

Study groups in NCT05963997
Study groupRoleWhat they receive
Cohort 1ExperimentalUp to 6 evaluable participants will receive samuraciclib 240 mg in combination with elacestrant 300 mg in cycles of 28 days (Cycle 1 to 6), 56 days (Cycle 7 to 9) and up to 84 days (Cycles 10 onwards).
Receives: Drug: Samuraciclib; Drug: Elacestrant Dihydrochloride
Cohort 2ExperimentalUp to 6 evaluable participants will receive samuraciclib in combination with elacestrant at the SRC recommended dose (anticipated 360mg samuraciclib, 300 mg elacestrant) in cycles of 28 days (Cycle 1 to 6), 56 days (Cycle 7 to 9) and up to 84 days (Cycles 10 onward).
Receives: Drug: Samuraciclib; Drug: Elacestrant Dihydrochloride
Cohort 3ExperimentalUp to 6 evaluable participants will receive samuraciclib in combination with elacestrant at the SRC recommended dose (anticipated 360mg samuraciclib, 400 mg elacestrant) in cycles of 28 days (Cycle 1 to 6), 56 days (Cycle 7 to 9) and up to 84 days (Cycles 10 onward).
Receives: Drug: Samuraciclib; Drug: Elacestrant Dihydrochloride
Cohort 4 ExpansionExperimentalUp to 30 evaluable participants will receive samuraciclib in combination with elacestrant at the SRC recommended dose (anticipated 360mg samuraciclib, 400 mg elacestrant) in cycles of 28 days (Cycle 1 to 6), 56 days (Cycle 7 to 9) and up to 84 days (Cycles 10 onward).
Receives: Drug: Samuraciclib; Drug: Elacestrant Dihydrochloride

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Phase 1b (Dose-finding)

    Identification of Samuraciclib + Elacestrant combination, Phase 2, expansion dose level.

    Incidence and severity of adverse events as graded by the National Cancer Institute Common Terminology Criteria for Adverse events (NCI-CTCAE) v5.0. Safety will be assessed by monitoring treatment - emerged severe and dose limiting adverse events and clinically relevant changes in vital signs and clinical laboratory results

    Measured: From the date of first dose of any study intervention (Day 1 Cycle 1) and through 28 days after the last dose of any study intervention

  2. Phase 2 (Expansion)

    Progression Free Survival (PFS) is defined as the time from the date of first dose of IMP (Cycle 1 Day 1) to the date of the first documentation of objective progressive disease (PD) or death due to any cause, whichever occurs first.

    Measured: From the date of first dose of any study intervention (Cycle 1 Day 1) until the first documentation of disease progression, death, withdrawal of consent, or start of new anticancer therapy (assessed up to week 48)

Secondary outcomes (10)
  1. Treatment-Emergent Adverse Events and Laboratory Abnormalities (Safety and Tolerability)

    Type, incidence, severity (as graded by CTCAE v5.0), seriousness and relationship to study medications of AEs and any laboratory abnormalities. Safety will be assessed by monitoring adverse events and clinically relevant changes in vital signs and clinical laboratory results.

    Measured: From the date of first dose of any study intervention through 28 days after the last dose of any study intervention

  2. Clinical Benefit Response (CBR)

    CBR is defined as the overall complete response (CR), partial response (PR), or stable disease (SD) ≥ 24 weeks according to RECIST version 1.1 recorded from enrolment until disease progression, or death due to any cause.

    Measured: From the date of first dose of any study intervention (Cycle 1 Day 1) to ≥ 24 weeks or until disease progression or death to any cause (assessed up to week 24)

  3. Overall response rate (ORR)

    ORR is defined as the proportion of participants with a reduction in tumor burden with CR or PR according to RECIST version 1.1.

    ORR will be estimated for participants who received at least 1 dose of IMP, had measurable disease at baseline and had a postbaseline tumor assessment.

    Measured: the date of first dose of study intervention (Cycle 1 Day 1) until the first documentation of disease progression, death, withdrawal of consent, or start of new anticancer therapy (assessed up to week 48)

  4. Duration of Response (DOR)

    DOR is defined as the time from the date of first documentation of objective tumor response (CR or PR) to the earliest documented disease progression per RECIST version 1.1

    Measured: From the date of first dose of study intervention (Cycle 1 Day 1) until the first documentation of disease progression, death, withdrawal of consent, or start of new anticancer therapy (assessed up to week 48)

  5. Best percent change in tumor size.

    Best percent change in tumor size is defined as the percentage change in the sum of the longest diameters of target lesions

    Measured: From the date of first dose of study intervention (Cycle 1 Day 1) until the first documentation of disease progression, death, withdrawal of consent, or start of new anticancer therapy (assessed up to week 48)

  6. Samuraciclib plasma exposure: Cmax

    Plasma concentration for Samuraciclib

    Measured: Day 1 of Cycles 1 and Cycle 2 (each cycle is 28 days)

  7. Elacestrant exposure: Cmax

    Plasma concentrations for Elacestrant

    Measured: Day 1 of Cycles 1 and Cycle 2 (each cycle is 28 days)

  8. Samuraciclib plasma exposure: Ctrough

    Measured: Cycle 1 Day 2 and 15; Day 2 of Cycle 2; Day 1 of Cycles 3-6 and end of treatment within 28 days of last dose of IMP and prior to the initiation of a new anticancer therapy (each cycle is 28 days)]

  9. Elacestrant exposure: Ctrough

    Measured: Cycle 1 Day 2 and Day 15; Cycle 2 Day 2 of Cycle 2 and Day 1 of Cycles 3-6 and at end of treatment within 28 days of the last dose of IMP and prior to the initiation of a new anticancer therapy (each cycle is 28 days)

  10. Genotyping for ESR1 and TP53 mutations

    Genotyping for ESR1 and TP53 mutations to evaluate correlations between ESR1 and TP53 mutations and efficacy/safety findings

    Measured: Screening

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted27 Jul 2023
  2. Study start9 Oct 2023
  3. Primary completion6 Mar 2026
  4. Study completion6 Mar 2026

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1/2
Primary purpose
Treatment
Allocation
Non-randomised
Intervention model
Sequential
Masking
None (open label)
Enrolment
49 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05963997
Sponsor's protocol ID
CT7001_003
Other IDs
2023-503846-30-00, 2023-000072-35, 2023
Acronym
SUMIT-ELA
Status last verified
Mar 2026
First submitted
30 Jun 2023
Last updated
23 Mar 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A Phase 1/2 study testing Samuraciclib and Elacestrant Dihydrochloride in people with Metastatic Breast Cancer and Locally Advanced Breast Cancer, run by Carrick Therapeutics Limited at 23 sites in 4 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 8 inclusion and 7 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 23 Mar 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 23 sites in Spain, United States, France, United Kingdom. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this combined phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Phase 1b (Dose-finding) (time frame: From the date of first dose of any study intervention (Day 1 Cycle 1) and through 28 days after the last dose of any study intervention). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 23 Mar 2026.

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