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Advanced or Metastatic Breast CancerPhase 2NCT06105632

A Study to Learn About the Study Medicine Called PF-07220060 in Combination With Fulvestrant in People With HR-positive, HER2-negative Advanced or Metastatic Breast Cancer Who Progressed After a Prior Line of Treatment

A Phase 2 study testing PF-07220060 CDK4 inhibitor, Fulvestrant and Everolimus in people with Advanced or Metastatic Breast Cancer, run by Pfizer at 48 sites in 14 countries.

Active, not recruiting

Under way, not looking for participants. Everyone needed has enrolled. The study is still running.

Official record
Search all trials

Trial summary

The purpose of this study is to learn about the safety and how effective the study medicine (PF-07220060) plus fulvestrant is compared to the study doctor's choice of treatment in people with advanced or metastatic breast cancer. Advanced cancer is the one that is unlikely to be cured or taken care of with treatment. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Advanced or Metastatic Breast Cancer
What is being tested?
PF-07220060 CDK4 inhibitor, Fulvestrant and Everolimus
Could I receive a placebo?
No, everyone receives an active treatment
How many people
333 participants
Where
48 sitesin 14 countries
Study dates
9 Jan 2024to 21 Jan 2028
Phase
Phase 2
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 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Histological confirmation of breast cancer with evidence of locally advanced or metastatic disease, which is not amenable to surgical resection or radiation therapy with curative intent.
  • Documented estrogen receptor (ER) and/or progesterone receptor (PR)- positive tumor
  • Documented HER2-negative tumor
  • Able to provide a sufficient amount of representative formalin fixed, paraffin embedded (FFPE) tumor tissue specimen.
  • Must have received CDK4/6i plus NSAI defined per study protocol. There must be documented PD during or after CDK4/6i treatment.
  • Measurable disease or non-measurable bone only disease as defined by RECIST version 1.1.
  • Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) ≤2.

Who cannot join

  • Any medical or psychiatric condition that may increase the risk of study participation or make the participant inappropriate for the study.
  • In visceral crisis at risk of immediately life-threatening complications in the short term.
  • Known active uncontrolled or symptomatic central nervous system metastases, carcinomatous meningitis, or leptomeningeal disease.
  • Prior treatment with any of the following:
  • Everolimus or investigational anti-cancer agents in any setting
  • Prior chemotherapy in the advanced setting
Show all 9Show fewer
  • Radiation within 2 weeks of randomization
  • Current use or anticipated need for any prohibited food, supplements or concomitant medication(s) (ie, other anti-cancer therapies, other endocrine therapies, growth factors, chronic systemic corticosteroids, strong cytochrome P450 3A4/5 [CYP3A4/5] or uridine 5' diphosphate-glucuronosyltransferase 2B7 [UGT2B7] inhibitors and inducers, direct oral anticoagulants, proton pump inhibitors).
  • Inadequate renal function, hepatic dysfunction, or hematologic abnormalities.

Trial locations and contacts

48 sites in 14 countries.

48 sites in 14 countries

United States9 sites
  • Intermountain Health St. Vincent Regional Hospital

    Billings, Montana, 59101

  • Memorial Hermann Cancer Center

    Houston, Texas, 77030

  • Hoag Health Center Irvine

    Irvine, California, 92618

  • Hoag Hospital Irvine

    Irvine, California, 92618

  • Keck Hospital of USC

    Los Angeles, California, 90033

  • Los Angeles General Medical Center

    Los Angeles, California, 90033

  • USC/Norris Comprehensive Cancer Center

    Los Angeles, California, 90033

  • Hoag Memorial Hospital Presbyterian

    Newport Beach, California, 92663

  • MedStar Washington Hospital Center

    Washington D.C., District of Columbia, 20010

Other trials in United States

Japan7 sites
  • Chiba cancer center

    Chiba, 260-8717

  • St. Luke's International Hospital

    Chuo-ku, Tokyo, 104-8560

  • Hiroshima City Hiroshima Citizens Hospital

    Hiroshima, 730-8518

  • National Hospital Organization Osaka National Hospital

    Osaka, 540-0006

  • Gunma Prefectural Cancer Center

    Otashi, Gunma, 373-8550

  • Tohoku University Hospital

    Sendai, Miyagi, 980-8574

  • Osaka University Hospital

    Suita, Osaka, 565-0871

Other trials in Japan

Argentina5 sites
  • CIPREC

    Buenos Aires, Buenos Aires F.D., C1061

  • Clínica Universitaria Reina Fabiola

    Córdoba, X5004FHP

  • Instituto de Oncología de Rosario

    Rosario, Santa Fe Province, S2000KZE

  • Centro Para la Atención Integral del Paciente Oncologico (CAIPO)

    San Miguel de Tucumán, Tucumán Province, 4000

  • Clinica Viedma S. A

    Viedma, Río Negro Province, R8500ACE

Other trials in Argentina

Mexico4 sites
  • COI Centro Oncologico Internacional S.A.P.I. de C.V.

    Mexico City, Mexico City, 04700

  • Filios Alta Medicina S.A. de C.V.

    Monterrey, Nuevo León, 64460

  • Oaxaca Site Management Organization S.C.

    Oaxaca City, 68000

  • Instituto Veracruzano en Investigación Clínica S.C.

    Veracruz, 91851

Other trials in Mexico

Turkey (Türkiye)4 sites
  • Gulhane Egitim Arastirma Hastanesi

    Ankara, 06010

  • Ultramar Medical Imaging Center

    Ankara, 06420

  • Ultramar Medical Imaging Center

    Ankara, 06530

  • Medipol Mega Universite Hastanesi

    Stanbul, İ̇stanbul, 34214

Other trials in Turkey (Türkiye)

Brazil3 sites
  • Liga Norte Riograndense Contra o Câncer

    Natal, Rio Grande do Norte, 59062-000

  • Hospital São Lucas da PUCRS

    Porto Alegre, Rio Grande do Sul, 90610-000

  • Instituto D'Or de Pesquisa e Ensino (IDOR) - Filial Pernambuco

    Recife, Pernambuco, 50070-480

Other trials in Brazil

China3 sites
  • Hunan Cancer Hospital

    Changsha, Hunan, 410013

  • Fudan University Shanghai Cancer Center

    Shanghai, Shanghai Municipality, 200032

  • Tongji Hospital, Tongji Medical College of Huazhong University of Science and Technology

    Wuhan, Hubei, 430030

Other trials in China

South Korea3 sites
  • Seoul National University Hospital

    Seoul, Seoul-teukbyeolsi [seoul], 03080

  • Gangnam Severance Hospital, Yonsei University Health System

    Seoul, Seoul-teukbyeolsi [seoul], 06273

  • Ajou University Hospital

    Suwon, Kyǒnggi-do, 16499

Other trials in South Korea

Canada2 sites
  • Royal Victoria Regional Health Centre

    Barrie, Ontario, L4M 6M2

  • CIUSSS- saguenay-Lac-Saint-Jean

    Chicoutimi, Quebec, G7H 5H6

Other trials in Canada

India2 sites
  • Rajiv Gandhi Cancer Institute And Research Centre

    New Delhi, National Capital Territory of Delhi, 110085

  • Sahyadri Super Speciality Hospital

    Pune, Maharashtra, 411004

Other trials in India

Israel2 sites
  • Rambam Health Care Campus

    Haifa, Northern District, 3109601

  • Shaare Zedek Medical Center

    Jerusalem, Jerusalem, 9103102

Other trials in Israel

United Kingdom2 sites
  • Sarah Cannon Research Institute UK

    London, London, CITY of, w1g 6ad

  • Imperial College Healthcare NHS Trust, Charing Cross Hospital

    London, W68RF

Other trials in United Kingdom

Australia1 site
  • Icon Cancer Centre Townsville

    Rosslea, Queensland, 4812

Other trials in Australia

Taiwan1 site
  • Chang Gung Medical Foundation-Linkou Branch

    Taoyuan, 333

Other trials in Taiwan

About this study

Official title: AN INTERVENTIONAL, OPEN-LABEL, RANDOMIZED, MULTICENTER PHASE 2 STUDY OF PF-07220060 PLUS FULVESTRANT COMPARED TO INVESTIGATOR'S CHOICE OF THERAPY IN PARTICIPANTS AT LEAST 18 YEARS OF AGE WITH HORMONE RECEPTOR-POSITIVE, HER2-NEGATIVE ADVANCED/METASTATIC BREAST CANCER WHOSE DISEASE PROGRESSED AFTER PRIOR CDK 4/6 INHIBITOR-BASED THERAPY (FOURLIGHT-1)

The purpose of this study is to learn about the safety and how effective the study medicine (PF-07220060) plus fulvestrant is compared to the study doctor's choice of treatment in people with advanced or metastatic breast cancer. Advanced cancer is the one that is unlikely to be cured or taken care of with treatment. Metastatic cancer is the one that has spread to other parts of the body.

This study is seeking female and male participants who:

Read more
  • are 18 years of age or older;
  • are hormone receptor (HR)-positive and human epidermal growth factor receptor 2 (HER2)-negative;
  • have advanced or metastatic breast cancer after taking other treatments before this study;
  • have not taken or need to take medications that are not allowed by the study protocol;
  • do not have any medical or mental conditions that may increase the risk of study participation.

Half of the participants will take PF-07220060 two times daily by mouth along with fulvestrant. Fulvestrant will be given as a shot into the muscle. The other half will take the study doctor's choice of treatment which can either be:

  • Fulvestrant alone taken as shot into the muscle.
  • Everolimus along with exemestane taken once daily by mouth.

This study will compare the experiences of participants receiving the study medicine plus fulvestrant to those who are receiving the study doctor's choice of treatment. This will help decide if the study medicine is safe and effective.

Participants will receive study treatment and/or will be in the study until:

  • imaging scans (such as an MRI and/or CT) show that their cancer is getting worse.
  • the study doctor thinks the participant is no longer benefitting from the study medicine.
  • has side effects that become too severe. A side effect is a reaction (expected or unexpected) to a medicine or treatment you take.
  • the participant chooses to stop taking part.
Being tested
PF-07220060 CDK4 inhibitor, Fulvestrant, Everolimus, Exemestane
Keywords
Estrogen receptor positive [ER(+)], Human epidermal growth factor receptor 2 negative [HER(-)], ER(+)/HER2(-), Advanced Breast Cancer, Breast tumor, Breast cancer, fulvestrant, everolimus, exemestane, Partial Response+ (PR+), Metastatic breast cancer, Hormone Therapy, Hormone positive breast cancer, Recurrent breast cancer, HR+, HER2-negative, Relapse, Recurrent, Second line treatment.
Medical subject headings
Breast Neoplasms, Recurrence

What participants receive

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

  • PF-07220060 CDK4 inhibitorDrug

    Experimental

  • FulvestrantDrug

    Experimental and Active comparator

  • EverolimusDrug

    Active Comparator

  • ExemestaneDrug

    Active Comparator

Study groups in NCT06105632
Study groupRoleWhat they receive
Arm AExperimentalPF-07220060 to be taken by mouth as a tablet in combination with fulvestrant (a solution for injection)
Receives: Drug: PF-07220060 CDK4 inhibitor; Drug: Fulvestrant
Arm BActive comparatorInvestigator's choice of therapy of either: * Fulvestrant alone (a solution for injection), or * Everolimus in combination with exemestane, both a tablet to be taken by mouth.
Receives: Drug: Fulvestrant; Drug: Everolimus; Drug: Exemestane

What is being measured

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

  1. Progression-Free Survival (PFS) progression, as determined by investigator per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1

    Measured: From Initiation up to 2 years

Secondary outcomes (14)
  1. Overall Survival (OS)

    Measured: Time from the date of randomization to the date of death due to any cause up to approximately 3 years

  2. OR by investigator per RECIST v1.1

    Measured: Time From randomization date (every 8 weeks during the first 48 weeks and then every 12 weeks) to the date of progression OR death whichever occurs first (up to approximately 2 years)

  3. Duration of Response (DOR) as defined by investigator per RECIST v1.1

    Measured: From the date of the first objective response (every 8 weeks during the first 48 weeks and then every 12 week) up to approximately 2 years.

  4. Number of Participants With Clinical Benefit Response (CBR) by investigator per RECIST v1.1

    Measured: From randomization date (every 8 weeks during the first 48 weeks and then every 12 weeks) up to approximately 2 years

  5. Number or Patients with Adverse Events (AEs) by Type

    Measured: From screening until 28 days after the last dose, to approximately 3 years

  6. Number or Patients with AEs by Incidence

    Measured: From screening until 28 days after the last dose, to approximately 3 years

  7. Number or Patients with AEs by Seriousness

    Measured: From screening until 28 days after the last dose, to approximately 3 years

  8. Number or Patients with AEs by relationship to study interventions

    Measured: From screening until 28 days after the last dose, to approximately 3 years

  9. Number of Participants With Abnormal Electrocardiogram (ECG)

    Measured: From baseline to approximately 2 years

  10. Number of Participants With Laboratory Test Abnormalities

    Measured: From screening until 28 days after the last dose to approximately 2 years

  11. EQ-5D-5L

    Measured: Screening Days 1, 15 of Cycle 1 and 2, Day 1 of Cycles 3-6, then Day 1 of every other subsequent Cycle starting with Cycle 8 (eg, Cycles 8, 10, 12, etc) and EoT. Each Cycle is 28 days.

  12. EORTC QLQ

    Measured: Screening Days 1, 15 of Cycle 1 and 2, Day 1 of Cycles 3-6, then Day 1 of every other subsequent Cycle starting with Cycle 8 (eg, Cycles 8, 10, 12, etc) and EoT. Each Cycle is 28 days.

  13. EORTC QLQ Breast Cancer Module 23 (BR23)

    Measured: Screening Days 1, 15 of Cycle 1 and 2, Day 1 of Cycles 3-6, then Day 1 of every other subsequent Cycle starting with Cycle 8 (eg, Cycles 8, 10, 12, etc) and EoT. Each Cycle is 28 days.

  14. Ctrough of PF-07220060

    Measured: Cycle 1 (Day 15), Cycle 2 (Day 1), and Cycle 3 (Day 1). Each Cycle is 28 days

Timeline

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

  1. First posted27 Oct 2023
  2. Study start9 Jan 2024
  3. Primary completion12 Jan 2026
  4. Study completion21 Jan 2028 (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 2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
None (open label)
Enrolment
333 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06105632
Sponsor's protocol ID
C4391022
Other IDs
2023-506487-13-00, 2023
Status last verified
Aug 2026
First submitted
24 Oct 2023
Last updated
20 Aug 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
Yes: Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical\_trials/trial\_data\_and\_results/data\_requests.

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing PF-07220060 CDK4 inhibitor, Fulvestrant and Everolimus in people with Advanced or Metastatic Breast Cancer, run by Pfizer at 48 sites in 14 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 7 inclusion and 9 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: under way, not looking for participants, as of the sponsor's last update on 20 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 48 sites in United States, Japan, Argentina, Mexico, Turkey (Türkiye) and 9 more countries. 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 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?

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?

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?

Progression-Free Survival (PFS) progression, as determined by investigator per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 (time frame: From Initiation up to 2 years). 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 20 Aug 2026.

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