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Clinical trialNCT03633331CompletedPhase 2Interventional

Palbociclib and Letrozole or Fulvestrant in Treating Patients With Estrogen Receptor Positive, HER2 Negative Metastatic Breast Cancer

SponsorAlliance for Clinical Trials in OncologyEnrollment93Estrogen Receptor-positive Breast CancerHER2/Neu NegativeStage IV Breast Cancer AJCC v6 and v7
View the registry record on ClinicalTrials.gov

Summary

The registered summary isn't in our current data snapshot. Read it on the ClinicalTrials.gov record ↗. Why? →

Investigators

The overall officials registered on this study. Names that resolve to a findmyKOL profile link to it; the rest are shown as registered.

A profile link is shown only when the registered name resolves to a person record with a confident, namesake-checked match; ambiguous names stay unlinked.

Sites

447 registered facilities, with the per-site recruitment status where the registry publishes one. ClinicalTrials.gov does not publish per-site enrollment counts.

United States
  • Alaska Breast Care and Surgery Llc

    Anchorage, Alaska, United States

  • Alaska Oncology and Hematology Llc

    Anchorage, Alaska, United States

  • Alaska Women'S Cancer Care

    Anchorage, Alaska, United States

  • Anchorage Associates in Radiation Medicine

    Anchorage, Alaska, United States

  • Anchorage Oncology Centre

    Anchorage, Alaska, United States

  • Anchorage Radiation Therapy Center

    Anchorage, Alaska, United States

  • Katmai Oncology Group

    Anchorage, Alaska, United States

  • Providence Alaska Medical Center

    Anchorage, Alaska, United States

  • Kingman Regional Medical Center

    Kingman, Arizona, United States

  • Pcr Oncology

    Arroyo Grande, California, United States

  • Providence Saint Joseph Medical Center/disney Family Cancer Center

    Burbank, California, United States

  • City of Hope Corona

    Corona, California, United States

  • City of Hope Comprehensive Cancer Center

    Duarte, California, United States

  • City of Hope Antelope Valley

    Lancaster, California, United States

  • City of Hope Mission Hills

    Mission Hills, California, United States

  • Saint Joseph Hospital - Orange

    Orange, California, United States

  • University of California Davis Comprehensive Cancer Center

    Sacramento, California, United States

  • City of Hope - Santa Clarita

    Santa Clarita, California, United States

  • City of Hope South Pasadena

    South Pasadena, California, United States

  • City of Hope Upland

    Upland, California, United States

  • City of Hope West Covina

    West Covina, California, United States

  • Cancer Center of Colorado at Sloan'S Lake

    Denver, Colorado, United States

  • Scl Health Saint Joseph Hospital

    Denver, Colorado, United States

  • Good Samaritan Medical Center

    Lafayette, Colorado, United States

  • Scl Health Lutheran Medical Center

    Wheat Ridge, Colorado, United States

  • Beebe Medical Center

    Lewes, Delaware, United States

  • Christiana Care Health System-Christiana Hospital

    Newark, Delaware, United States

  • Delaware Clinical and Laboratory Physicians Pa

    Newark, Delaware, United States

  • Helen F Graham Cancer Center

    Newark, Delaware, United States

  • Medical Oncology Hematology Consultants Pa

    Newark, Delaware, United States

  • Beebe Health Campus

    Rehoboth Beach, Delaware, United States

  • Nanticoke Memorial Hospital

    Seaford, Delaware, United States

  • Christiana Care Health System-Wilmington Hospital

    Wilmington, Delaware, United States

  • Sibley Memorial Hospital

    Washington D.C., District of Columbia, United States

  • the Watson Clinic

    Lakeland, Florida, United States

  • Hawaii Cancer Care Inc-Liliha

    Honolulu, Hawaii, United States

  • Hawaii Cancer Care Inc-Pob Ii

    Honolulu, Hawaii, United States

  • Hawaii Oncology Inc-Kuakini

    Honolulu, Hawaii, United States

  • Hawaii Oncology Inc-Pob I

    Honolulu, Hawaii, United States

  • Island Urology

    Honolulu, Hawaii, United States

407 more sites on the registry record.ClinicalTrials.gov ↗

Site investigator names are published by ClinicalTrials.gov only while a study recruits, so completed studies list sites without them.

Drugs studied

No drug or biological interventions are in our data for this study — it may test a procedure, device or behavioral intervention, or the intervention list isn't in our current snapshot. See the registry record ↗. Why? →

Registration & key dates

Registry attributes as recorded on the ClinicalTrials.gov study record.

Start
15 Aug 2018
Primary completion
8 Sept 2020
Completion
27 Feb 2026
Last update posted
29 Apr 2026
Registered enrollment
93
Registry id
NCT03633331

Source: ClinicalTrials.gov, via the CTTI AACT database, data as of 12 Jul 2026. Registry facts are shown as registered by the study sponsor; findmyKOL does not interpret them.