Recruiting
Phase 2

Abemaciclib

Sponsor:

University of Washington

Code:

NCT06179303

Conditions

Anatomic Stage III Breast Cancer AJCC v8

Anatomic Stage IV Breast Cancer AJCC v8

Locally Advanced Unresectable HER2-Negative Breast Carcinoma

Locally Advanced Unresectable Hormone Receptor-Positive Breast Carcinoma

Metastatic HER2-Negative Breast Carcinoma

Eligibility Criteria

Sex: All

Age: 18+

Healthy Volunteers: Not accepted

Interventions

Abemaciclib

Anastrozole

Biospecimen Collection

Computed Tomography

Diagnostic Imaging Testing

Study Details

Brief summary:

This phase II trial tests the accuracy of functional imaging (FFNP)-positron emission tomography (PET)/computed tomography (CT) to predict response to abemaciclib plus endocrine therapy. Abemaciclib is a drug used to treat certain types of hormone receptor positive (HR+), HER2 negative breast cancer. Abemaciclib blocks certain proteins, which may help keep tumor cells from growing. Endocrine therapy adds, blocks, or removes hormones that can cause cancer to grow. FFNP PET imaging is a form of x-ray that uses FFNP as an imaging agent that may provide more precise information about the location of tumors that "light up" with FFNP than a PET scan alone can provide.

Conditions

Anatomic Stage III Breast Cancer AJCC v8

Anatomic Stage IV Breast Cancer AJCC v8

Locally Advanced Unresectable HER2-Negative Breast Carcinoma

Locally Advanced Unresectable Hormone Receptor-Positive Breast Carcinoma

Metastatic HER2-Negative Breast Carcinoma

Study ID

NCT06179303

Start date

Jul 22, 2024

Status verified date

Apr, 2026

Completion date

Jun 1, 2028

Anticipated

Primary completion date

Mar 1, 2027

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: All

Age: 18+

Healthy Volunteers: Not accepted

Inclusion Criteria:

  • Men or women with metastatic or locally advanced unresectable breast cancer
  • Histologically confirmed ER+ / HER2-negative, breast cancer who is a candidate for endocrine therapy with pathology from the primary tumor or metastatic/recurrent site. Based on American Society of Clinical Oncology/College of American Pathologists (ASCO CAP) Guidelines: ER+: >= 1% of tumor cell nuclei to be immunoreactive. HER2-negative: HER2 of 0, 1+ by immunohistochemistry (IHC) or negative by fluorescence in situ hybridization (FISH).

  • In the case of bone biopsy which could yield false negative ER or PR status in patients with historically HR+ disease, a patient may be eligible if the treating physician and the study chair both agree that the patient is a candidate for further endocrine therapy (ET) based treatment.
  • Note that baseline PR status by IHC does not influence results of deltaFFNP-PET imaging.
  • If premenopausal, the patient has to be treated with GnRH agonist for at least 6 weeks prior to FFNP-PET.
  • Disease must be present in at least one non-liver site and measurable by Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 criteria and be 1.5 cm or greater in longest dimension OR disease can be non-measurable but must be 1.5 cm in longest dimension on functional imaging (fluorodeoxyglucose \[FDG\]-PET/computed tomography \[CT\] preferred).
  • No limits to prior lines of endocrine therapy in the metastatic setting including synergistic targeted therapy such as CDK4/6 inhibitors (other than Abemaciclib), PI3K inhibitor, mTOR inhibitor, etc. One line of prior cytotoxic chemotherapy in the metastatic setting is allowed. Washout from prior systemic anti-cancer therapy of at least 2 weeks from chemotherapy or radiation, 2 weeks or 5 half lives (whichever is longer) from oral selective estrogen receptor degrader (SERD), 8 weeks from oral selective estrogen receptor modulator (SERM), and 16 weeks from intramuscular SERD (Fulvestrant) is required. Recovery of adverse events from the last therapy to grade 1 except alopecia. Patients may continue luteinizing hormone-releasing hormone (LHRH) agonist to remain post-menopausal without a need for washout
  • Eastern Cooperative Oncology Group (ECOG) performance status =< 2
  • At least 18 years of age
  • Absolute neutrophil count >= 1,500/uL
  • Platelets >= 100,000/uL
  • Hemoglobin >= 9g/dL
  • Total bilirubin =< 1.5 x institutional upper limit of normal (ULN).

  • In case of known Gilbert's syndrome, < 2 x ULN is allowed
  • Aspartate aminotransferase (AST) serum glutamic oxaloacetic transaminase (SGOT) /alanine aminotransferase (ALT) serum glutamic pyruvic transaminase (SGPT) =< 2.5x institutional ULN, or =< 5 x ULN for subjects with documented metastatic disease to the liver
  • eGFR (estimated glomerular filtration rate) ≥ 30 mL/min
  • Women of childbearing potential must agree to use adequate contraception (barrier method of birth control, abstinence) prior to study entry and for the duration of study participation
  • Ability to understand and willingness to sign an institutional review board (IRB)-approved written informed consent document (or that of legally authorizes representative, if applicable)
  • Consent to access archival tumor specimens for clinical sequencing data of tumor tissue and blood

Exclusion Criteria:

  • Prior abemaciclib in the metastatic setting or within 2 years of completion of adjuvant abemaciclib
  • Hepatic-only metastatic disease
  • A history of other malignancy with the exception of malignancies for which all treatment was completed at least 2 years before registration and the patient has no evidence of disease
  • Currently receiving any other investigational agents
  • Untreated/unstable brain metastases. Patients with treated/stable brain metastases, defines as patients who have received prior therapy for their brain metastases and whose central nervous system (CNS) disease is radiographically stable at study entry, are eligible
  • A history of allergic reactions attributed to compounds of similar chemical or biologic composition to FFNP, abemaciclib, or other agents used in the study
  • Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, or cardiac arrhythmia
  • Pregnant and/or breastfeeding women of childbearing potential must have a negative pregnancy test within 14 days of study entry. Male participants and female participants of childbearing potential must utilize adequate contraceptive methods throughout study treatment and for at least 30 days after the last dose of study medications
  • Patients with human immunodeficiency virus (HIV) are eligible unless their CD4+ T-cell counts are < 350 cells/mcL or they have a history of acquired immunodeficiency syndrome (AIDS)-defining opportunistic infection within the 12 months prior to registration. Concurrent treatment with effective antiretroviral therapy (ART) according to Department of Health and Human Services (DHHS) treatment guidelines is recommended

Study Design

Enrollment

60 participants

Anticipated

Intervention Model

Single group

Primary purpose

Treatment

Interventions and Outcome Measures

Arms

experimental: Treatment (FFNP-PET/CT, estradiol, abemaciclib, ET)

Patients receive FFNP IV and undergo PET/CT imaging at baseline. Patients then receive estradiol orally Q8H over a 24-hour period, followed again by FFNP IV and PET/CT imaging. Patients then receive 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 also receive ET of the treating physician choice. Patients also receive FDG IV and undergo PET/CT imaging at baseline, with additional diagnostic imaging for tumor assessment every 3 cycles, and undergo blood sample collection throughout the study.

Interventions

Abemaciclib

Given PO

Anastrozole

Given PO

Biospecimen Collection

Undergo blood sample collection

Computed Tomography

Undergo PET/CT

Diagnostic Imaging Testing

Undergo clinical imaging for tumor assessment

Exemestane

Given PO

Fludeoxyglucose F-18

Given IV

Fluorine F 18 Fluoro Furanyl Norprogesterone

Given IV

Fulvestrant

Given IM injection

Gonadotropin-releasing Hormone Analog

Given GnRH analog

Letrozole

Given PO

Positron Emission Tomography

Undergo PET/CT

Tamoxifen

Given PO

Therapeutic Estradiol

Given PO

Primary outcome measure

  • Response to abemaciclib + endocrine therapy [ Time Frame: Up to 2 years ]

Central Contacts and Locations

Central contacts

Hannah Linden

206-606-2053hmlinden@uw.edu

Locations

Siteman Cancer Center at Washington University

Recruiting

St Louis, Missouri, United States, 63110

Contacts

Farrokh Dehdashti

314-362-2809dehdashtif@wustl.edu

Principal Investigator:

Farrokh Dehdashti

Fred Hutch/University of Washington Cancer Consortium

Recruiting

Seattle, Washington, United States, 98109

Contacts

Hannah Linden

206-606-2053hmlinden@uw.edu

Principal Investigator:

Hannah Linden

More Information

Sponsor

University of Washington

Last update posted

Apr 16, 2026

Last verified

Apr, 2026

Trial information was received from ClinicalTrials.gov and was last updated on 2026-09-09. This information was provided to ClinicalTrials.gov by University of Washington on 2026-04-16.