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Anatomic Stage III Breast Cancer AJCC v8Phase 1NCT05372640

Testing the Safety and Efficacy of the Combination of Two Anti-cancer Drugs, ZEN003694 and Abemaciclib, for Adult and Pediatric Patients (12-17 Years) With Metastatic or Unresectable NUT Carcinoma, Breast Cancer and Other Solid Tumors

A Phase 1 study testing Abemaciclib, BET Bromodomain Inhibitor ZEN-3694 and Biopsy Procedure in people with Anatomic Stage III Breast Cancer AJCC v8 and Anatomic Stage IV Breast Cancer AJCC v8, run by National Cancer Institute (NCI) at 7 sites in United States.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

This phase I trial tests the safety, side effects, and best dose of ZEN003694 when given together with abemaciclib in treating patients with NUT carcinoma, breast cancer or other solid tumors that have spread from where it first started (primary site) to other places in the body (metastatic) or cannot be removed by… Read more about this study

Who is it for?
Ages 12 years and older
What is being tested?
Abemaciclib, BET Bromodomain Inhibitor ZEN-3694 and Biopsy Procedure
Type of treatment
Surgery or procedure
Could I receive a placebo?
No, everyone receives an active treatment
How many people
45 participants
Where
7 sitesUnited States
Study dates
10 Aug 2023to 7 Jun 2027
Phase
Phase 1
Are there results?
Not yet: the study is under way

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 12 years and older
  • All sexes
  • No healthy volunteers
  • Child, Adult, Older adult

Who may be able to join

  • Participants must have histologically confirmed malignancy that is metastatic or unresectable and for which standard curative or palliative measures do not exist or are no longer effective
  • Dose Escalation Cohort Only: Participants must have evaluable disease or measurable disease per RECIST 1.1 criteria
  • Dose Expansion Cohort Only:
  • Participants must have a diagnosis of NUT carcinoma (NC) based on standard criteria for the disease, with diagnostic testing performed in a Clinical Laboratory Improvement Act (CLIA) certified laboratory:
  • Ectopic expression of NUT protein per World Health Organization (WHO) criteria as determined by immunohistochemistry (IHC) testing, OR
  • Detection of the NUT gene translocation as determined by fluorescence in situ hybridization (FISH) testing, OR
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  • Detection of the NUT gene translocation as determined by either deoxyribonucleic acid (DNA) next-generation sequencing (NGS) or ribonucleic acid (RNA) sequencing.
  • Participants must have measurable disease per RECIST 1.1 criteria
  • Any number of prior lines of therapy in the metastatic setting are allowed, including prior BET inhibitor therapy and prior CDK4/6 inhibitor therapy
  • Patients who received chemotherapy must have recovered (Common Terminology Criteria for Adverse Events [CTCAE] grade =< 1) from the acute effects of chemotherapy except for residual alopecia or grade 2 peripheral neuropathy
  • Patients who received radiotherapy must have completed and fully recovered from the acute effects of radiotherapy. A washout period of at least 14 days is required between end of radiotherapy
  • Participants may have previously undergone surgical resection
  • Age >= 12 years. Patients 12-17 years of age must be > 40 kg at enrollment. Patients 12-17 years of age will not participate in the mandatory tumor biopsies. Since there is no data on patients less than 18 years of age, this population may require lower doses and additional safety precautions and should be closely monitored. Because no dosing or adverse event data are currently available on the use of ZEN003694 in combination with abemaciclib in patients < 12 years of age, younger children are excluded from this study
  • Eastern Cooperative Oncology Group (ECOG) performance status =< 2 for participants >= 16 years of age, Lansky >= 50% if < 16 years of age
  • Hemoglobin >= 8 g/dL; Patients may receive erythrocyte transfusions to achieve this hemoglobin level at the discretion of the investigator. Initial treatment must not begin earlier than the day after the erythrocyte transfusion
  • Absolute neutrophil count >= 1.5 x 10^9/L
  • Platelets >= 1 x 10^11/L
  • Total bilirubin =< 1.5 x institutional upper limit of normal (ULN) for age. Patients with Gilbert's syndrome with a total bilirubin =< 2.0 times ULN and direct bilirubin within normal limits are permitted
  • Aspartate aminotransferase (AST) (serum glutamic-oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT]) =< 2.5 x institutional ULN for age
  • Serum or plasma creatinine =< 1.5 x institutional ULN OR calculated creatinine clearance >= 50 mL/min (via the chronic kidney disease epidemiology [CKD-EPI] glomerular filtration rate estimation) for participants >= 18 years old, or 60 mL/min/1.73m^2 for patients 12-17 years as calculated based on bedside Schwartz formula
  • Human immunodeficiency virus (HIV)-infected patients on effective anti-retroviral therapy with undetectable viral load within 6 months are eligible for this trial
  • For patients with evidence of chronic hepatitis B virus (HBV) infection, the HBV viral load must be undetectable on suppressive therapy, if indicated
  • Patients with a history of hepatitis C virus (HCV) infection must have been treated and cured. For patients with HCV infection who are currently on treatment, they are eligible if they have an undetectable HCV viral load. Hepatitis C (HepC antibody) testing is required. Hepatitis C RNA is optional; however, a confirmatory negative Hepatitis C RNA test must be obtained to be able to enroll participants with positive Hepatitis C antibody due to prior resolved disease
  • Patients with treated brain metastases are eligible if follow-up brain imaging after central nervous system (CNS)-directed therapy shows no evidence of progression and has been clinically stable for at least 1 month. Patients must meet the following criteria:
  • Disease outside the CNS is present
  • Recovery from acute toxicity associated with the treatment to =< CTCAE grade 1 or baseline (with the exception of alopecia), with no requirement for escalating doses of corticosteroids over the past 7 days
  • Patients with a prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational regimen are eligible for this trial
  • Patients should be New York Heart Association Functional Classification of class 2B or better
  • Ability to swallow and retain oral medications
  • The effects of ZEN00364 and abemaciclib on the developing human fetus are unknown. For this reason and because BETi and CDKi-inhibiting agents are known to be teratogenic, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation. Women of child-bearing potential must have a negative pregnancy test prior to study entry. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately. Men and women treated or enrolled on this protocol must also agree to use adequate contraception prior to the study, for the duration of study participation, and 3 weeks after completion of ZEN003694 and abemaciclib administration
  • For female subjects of child-bearing potentially receiving ZEN003694, hormonal means of birth control alone, such as oral, injectable, dermal, subdermal or topical contraceptives are NOT acceptable forms of birth control given that their efficacy has not been evaluated when given in combination with the investigational drugs. "Adequate contraception" is defined as the following:
  • Contraceptive methods with a failure rate of =< 1% used in combination with the barrier method. The following contraceptive methods are acceptable to use in combination with the barrier method: intrauterine device (IUD), intrauterine system (IUS), or oral contraceptive pills (OCPs) that meet the < 1% failure rate as stated in the product label. Note: Hormonal IUDs/OCPs may only be used if the following criteria are met: male condoms are required AND subjects are informed of the potential for reduced systemic hormone levels from the IUD/OCP when taking ZEN003694. Alternatively, male partner sterilization (vasectomy with documentation of azoospermia) prior to the female subject's entry into the study, and this male is the sole partner for that subject. For this definition, "documented" refers to the outcome of the investigator's/designee's medical examination of the subject or review of the subject's medical history for study eligibility, as obtained via a verbal interview with the subject or from the subject's medical records
  • Male subjects with female partners of child-bearing potential must use one of the following contraceptive methods:
  • Vasectomy with documentation of azoospermia OR
  • Condom use PLUS partner use of a highly effective contraceptive (=< 1% rate of failure per year) such as intrauterine device or system, or hormonal birth control such as contraceptive subdermal implant, combined estrogen and progestogen oral contraceptive, injectable progestogen, contraceptive vaginal ring, or percutaneous contraceptive patches
  • Male subjects should not donate sperm while on study and for 12 weeks after the last dose of study medication. Male subjects whose partners are or become pregnant must continue to use condoms for 12 weeks after the last dose of study medication
  • Women of childbearing potential must have a negative pregnancy test within 7 days of starting treatment
  • Ability to understand and the willingness to sign a written informed consent document. Participants with impaired decision-making capacity who have a legally-authorized representative (LAR) and/or family member available may be eligible after discussion with the Principal Investigator of this study. There will be a separate assent process for minors

Who cannot join

  • Participants who have had cytotoxic chemotherapy, immunotherapy, or other investigational therapy within 2 weeks prior to entering the study. There is a two-week required washout period for previous BET inhibitor therapy
  • Participants who have had radiotherapy within at least 2 weeks prior to entering the study. Stereotactic radiosurgery (SRS) within 1 week prior to entering the study will be allowed
  • Participants who have had major surgery within 3 weeks prior to entering the study
  • Participants who have received tyrosine kinase inhibitors (TKIs) or small molecules within 5 half-lives or 1 week (whichever is shorter) of study entry
  • Patients who are receiving any other investigational agents
  • History of allergic reactions attributed to compounds of similar chemical or biologic composition to ZEN003694 or abemaciclib
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  • Patients requiring medications or substances that are strong inhibitors or strong inducers of CYP3A4 or CYP3A enzymes are ineligible. Strong inhibitors or inducers of CYP3A4 must be discontinued at least 7 days prior to the first dose of ZEN003694 and abemaciclib. Because the lists of these agents are constantly changing, it is important to regularly consult a frequently-updated list such as http://medicine.iupui.edu/clinpharm/ddis/table.aspx; medical reference texts such as the Physicians' Desk Reference may also provide this information. As part of the enrollment/informed consent procedures, the patient will be counseled on the risk of interactions with other agents, and what to do if new medications need to be prescribed or if the patient is considering a new over-the-counter medicine or herbal product
  • Patients with uncontrolled intercurrent illness, including but not limited to: ongoing or active infection requiring systemic therapy, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, interstitial lung disease, severe dyspnea at rest or requiring oxygen therapy, severe renal impairment (e.g. estimated creatinine clearance < 30ml/min), history of major surgical resection involving the stomach or small bowel, or preexisting Crohn's disease or ulcerative colitis or a preexisting chronic condition resulting in baseline grade 2 or higher diarrhea that, in the judgment of the investigator, would preclude participation in this study
  • Patients receiving any medications or substances that are strong inhibitors or inducers of CYP3A4 or substrates of CYP1A2 with narrow therapeutic windows are ineligible. Strong inhibitors or inducers of CYP3A4 must be discontinued at least 7 days prior to the first dose of ZEN003694. As proton pump inhibitors (PPIs), H2 receptor antagonists, and antacids may alter the pharmacokinetics of ZEN003694 by reducing ZEN003694 exposure, patients receiving proton pump inhibitors are ineligible. If H2 blockers or other acid reducing agents are used concomitantly with ZEN003694, a staggered dosing schedule should be used. Because the lists of these agents are constantly changing, it is important to regularly consult a frequently-updated medical reference. As part of the enrollment/informed consent procedures, the patient will be counseled on the risk of interactions with other agents, and what to do if new medications need to be prescribed or if the patient is considering a new over-the-counter medicine or herbal product
  • Pregnant women are excluded from this study because ZEN003694 is a BETi agent with the potential for teratogenic or abortifacient effects. Because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with ZEN003694, breastfeeding should be discontinued if the mother is treated with ZEN003694. These potential risks may also apply to other agents used in this study
  • Fridericia's formula-corrected QT interval (QTcF) >= 450 msec on screening electrocardiogram (ECG) by Fredericia (machine or manual read allowed). Patients should avoid medications which prolong the QT
  • Patients receiving any medications or substances that are Factor Xa inhibitors (i.e., rivaroxaban, apixaban, betrixaban, edoxaban otamixaban, letaxaban, eribaxaban) or Factor IIa inhibitors (i.e., dabigatran). Low molecular weight heparin is allowed
  • Patients with radiation to > 25% of the bone marrow
  • Patients who have had a bone-targeted radionuclide within 6 weeks of the first dose of ZEN003694
  • Myocardial infarction or unstable angina within 6 months prior to the first dose of ZEN003694
  • Impairment of gastrointestinal function that may significantly alter the absorption of ZEN003694 and/or abemaciclib
  • The patient has a personal history of any of the following conditions: syncope of cardiovascular etiology, ventricular arrhythmia of pathological origin (including, but not limited to, ventricular tachycardia and ventricular fibrillation), or sudden cardiac arrest

Trial locations and contacts

7 sites in 1 country. Contact the study team or a site near you to ask about taking part.

7 sites in 1 country

United States7 sites, 7 recruiting

  • Dana-Farber Cancer Institute

    Boston, Massachusetts, 02215

    Site Public Contact, 877-442-3324

    Jia Luo

    Recruiting

  • UT MD Anderson Cancer Center

    Houston, Texas, 77030

    Site Public Contact, 866-632-6789, askmdanderson@mdanderson.org

    Sarina A. Piha-Paul

    Recruiting

  • Keck Medicine of USC Koreatown

    Los Angeles, California, 90020

    Site Public Contact, 213-388-0908

    Robert Hsu

    Recruiting

  • Los Angeles General Medical Center

    Los Angeles, California, 90033

    Site Public Contact, 323-865-0451, uscnorrisinfo@med.usc.edu

    Robert Hsu

    Recruiting

  • USC / Norris Comprehensive Cancer Center

    Los Angeles, California, 90033

    Site Public Contact, 323-865-0451

    Robert Hsu

    Recruiting

  • USC Norris Oncology/Hematology-Newport Beach

    Newport Beach, California, 92663

    Site Public Contact, 323-865-0451

    Robert Hsu

    Recruiting

  • UPMC Hillman Cancer Center

    Pittsburgh, Pennsylvania, 15232

    Site Public Contact, 412-647-8073

    Liza C. Villaruz

    Recruiting

Other trials in United States

About this study

Official title: A Phase 1 Study of BET Bromodomain Inhibitor ZEN003694 in Combination With the CDK4/6 Inhibitor Abemaciclib in Patients With NUT Carcinoma, Breast Cancer and Other Solid Tumors

This phase I trial tests the safety, side effects, and best dose of ZEN003694 when given together with abemaciclib in treating patients with NUT carcinoma, breast cancer or other solid tumors that have spread from where it first started (primary site) to other places in the body (metastatic) or cannot be removed by surgery (unresectable). ZEN003694 is an inhibitor of a family of proteins called the bromodomain and extra-terminal (BET). It may prevent the growth of tumor cells that overproduce BET protein. Abemaciclib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Giving ZEN003694 and abemaciclib may help shrink or stabilize cancer in patients with NUT carcinoma, breast cancer or other solid tumors.

Read the detailed description

PRIMARY OBJECTIVE:

  1. Determine the maximum tolerated dose (MTD) and recommended phase 2 dose (RP2D) of the combination of BET bromodomain inhibitor ZEN-3694 (ZEN003694) and abemaciclib.

SECONDARY OBJECTIVES:

  1. To observe and record anti-tumor activity. II. Determine the preliminary rates of progression-free survival (PFS), overall survival (OS), overall response rate (ORR), time to response (TTR) and duration of response (DoR) for the combination of ZEN003694 and abemaciclib in participants utilizing Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 criteria.

III. Evaluate the pharmacokinetic (PK) profile of the combination.

EXPLORATORY OBJECTIVE:

  1. Explore potential biomarker indicators of response and resistance in tumor tissue and blood samples.

OUTLINE: This is a dose-escalation study of BET bromodomain inhibitor ZEN-3694 followed by a dose expansion study.

Patients receive ZEN003694 orally (PO) once daily (QD) on days 1-28 or 5 days on and 2 days off of each cycle, and abemaciclib PO twice daily (BID) on days 1-28 of each cycle. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity. Patients undergo imaging evaluation, blood sample collection and tumor biopsy throughout the study.

After completion of study treatment, patients are followed up for 30 days, every 3 months for 2 years, and then every 6 months for 3 years.

Being tested
Abemaciclib, BET Bromodomain Inhibitor ZEN-3694, Biopsy Procedure, Biospecimen Collection, Diagnostic Imaging Testing
Medical subject headings
Breast Neoplasms, Neoplasm Metastasis

What participants receive

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

  • AbemaciclibDrug

    Also called LY 2835219, LY-2835219, LY2835219, Verzenio

    Given PO

  • BET Bromodomain Inhibitor ZEN-3694Drug

    Also called BETi ZEN-3694, ZEN 3694, ZEN-3694, ZEN003694

    Given PO

  • Biopsy ProcedureProcedure or surgery

    Also called Biopsy, BIOPSY_TYPE, Bx

    Undergo biopsy

  • Biospecimen CollectionProcedure or surgery

    Also called Biological Sample Collection, Biospecimen Collected, Sample Collection, Specimen Collection

    Undergo blood sample collection

  • Diagnostic Imaging TestingProcedure or surgery

    Also called Diagnostic Imaging, Medical Imaging

    Undergo imaging evaluation

Study groups in NCT05372640
Study groupRoleWhat they receive
Treatment (ZEN003694, abemaciclib)ExperimentalPatients receive ZEN003694 PO QD on days 1-28 or 5 days on and 2 days off of each cycle, and abemaciclib PO BID on days 1-28 of each cycle. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity. Patients undergo imaging evaluation, blood sample collection and tumor biopsy throughout the study.
Receives: Drug: Abemaciclib; Drug: BET Bromodomain Inhibitor ZEN-3694; Procedure: Biopsy Procedure; Procedure: Biospecimen Collection; Procedure: Diagnostic Imaging Testing

What is being measured

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

  1. Maximum tolerated dose or recommended phase 2 dose (Phase I dose escalation)

    The toxicity of the combination will be assessed using Common Terminology Criteria for Adverse Events (CTCAE) version (v). 5.0 criteria.

    Measured: During the first cycle of therapy (28 days)

  2. Incidence of adverse events (Phase I dose expansion)

    Safety will be reported with descriptive statistics. Toxicity will be graded according to National Cancer Institute CTCAE, v5.0. Toxicities will be summarized by maximum grade and by treatment arm. Incidence rate of each toxicity will be reported with 95% exact confidence intervals.

    Measured: Up to 5 years

  3. Overall response rate (Phase I dose expansion)

    Will be graded as complete response (CR), partial response (PR), stable disease (SD) and progressive disease.

    Measured: Up to 5 years

  4. Clinical benefit rate (CBR) (Phase I dose expansion)

    Clinical benefit is defined as CR, PR or SD >= 24 weeks according to Response Evaluation Criteria in Solid Tumors 1.1. CBR will be reported with 90% exact confidence intervals.

    Measured: Up to 5 years

  5. Duration of response (DoR) (Phase I dose expansion)

    Median DoR will be reported with ranges.

    Measured: From the time measurement criteria are met for CR or PR (whichever is first recorded) until the first date that recurrent or progressive disease is objectively documented, assessed up to 5 years

  6. Time to response (Phase I dose expansion)

    Measured: From the time initiation of therapy to the time measurement criteria are met for CR or PR (whichever is first recorded), assessed up to 5 years

  7. Overall survival (Phase I dose expansion)

    Measured: From study enrollment until death due to any cause, assessed up to 5 years

  8. Progression free survival (Phase I dose expansion)

    Measured: From study enrollment until the identification of disease progression or death, assessed up to 5 years

Secondary outcomes (2)

  1. Pharmacokinetics (PK)

    Designed the PK sampling to enable simultaneous estimation of individual pharmacokinetic parameters of abemaciclib, ZEN003694, and their respective metabolites using nonlinear mixed effects modeling. Will compare the ratio of observed/historical 90% confidence interval of abemaciclib exposure.

    Measured: Up to 5 years

  2. Thymidine kinase (TK)

    Will compare exposures of abemaciclib and abemaciclib metabolites to TK activity at cycle 1 day 15 and beyond and also change in TK activity versus clinical outcomes.

    Measured: Up to 5 years

Timeline

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

  1. First posted13 May 2022
  2. Study start10 Aug 2023
  3. Primary completion7 Jun 2027 (estimated)
  4. Study completion7 Jun 2027 (estimated)

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
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
45 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05372640
Sponsor's protocol ID
NCI-2022-04100
Other IDs
NCI-2022-04100, 10509, 10509, UM1CA186709
Status last verified
Jun 2026
First submitted
12 May 2022
Last updated
31 Jul 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
Yes: NCI is committed to sharing data in accordance with NIH policy. For more details on how clinical trial data is shared, access the link to the NIH data sharing policy page.

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing Abemaciclib, BET Bromodomain Inhibitor ZEN-3694 and Biopsy Procedure in people with Anatomic Stage III Breast Cancer AJCC v8 and Anatomic Stage IV Breast Cancer AJCC v8, run by National Cancer Institute (NCI) at 7 sites in United States.

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 38 inclusion and 17 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: looking for participants now, as of the sponsor's last update on 31 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 7 sites in United States. 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 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.

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

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

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

Each site lists its own contact: choose the nearest one under Trial locations. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Maximum tolerated dose or recommended phase 2 dose (Phase I dose escalation) (time frame: During the first cycle of therapy (28 days)). The study lists 8 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT05372640.

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 31 Jul 2026.

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