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Palbociclib

Phase 2

Female Breast Carcinoma | Small molecule | Oncology |Atrium Therapeutics, Inc.|Last Updated: May 5, 2026

Target and mechanism

Molecular targetCDK4, CCND1, CDK6
Target classInhibitor
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment40

FDA Designations

No designations recorded

Clinical trial landscape

Palbociclib · 1 trial · 2 indications

Phase 2 1
NCT02942355Trial of Anastrozole and Palbociclib in Metastatic HER2-Negative Breast CancerFemale Breast Carcinoma
ACTIVE NOT_RECRUITING40 Analytics
PHASE2ACTIVE NOT_RECRUITING
Trial of Anastrozole and Palbociclib in Metastatic HER2-Negative Breast Cancer
Female Breast CarcinomaUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of participants with neutropenia that leads to permanent treatment discontinuation
From enrollment to treatment discontinuation; participants remain on treatment until disease progression, unacceptable toxicity, participant withdrawal, or investigator decision. Assessed for approximately 4 years.

Determined for each subject as a binary variable indicating whether or not the participant experienced any neutropenic adverse event (according to NCI Common Terminology for Adverse Events version 4.0) that leads to permanent treatment discontinuation

Secondary Endpoints

Overall Survival (OS)
From date of treatment start to date of death, or censored as described; assessed for approximately 4 years
Progression Free Survival (PFS)
From treatment start date to date of progression/death, or censored as described; assessed for approximately 4 years.
Number of participants with an objective response
From enrollment to best response while on study treatment; participants remain on treatment until disease progression, unacceptable toxicity, participant withdrawal, or investigator decision. Assessed for approximately 4 years.
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort A: First-line therapyEXPERIMENTALAnastrozole by mouth daily and palbociclib by mouth Days 1-21 on a 28 day cycle
Cohort B: Maintenance therapyEXPERIMENTALAnastrozole by mouth daily and palbociclib by mouth Days 1-21 on a 28 day cycle

Interventions

NameTypeDescription
anastrozoleDRUGAnastrozole by mouth daily
PalbociclibDRUGPalbociclib by mouth daily days 1-21 every 28 days
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Eligibility Criteria

Age Range18 Years to N/A
SexFEMALE
Healthy VolunteersNo
Study Sites1

Inclusion Criteria: * Are 18 years of age or older, who are either: * Postmenopausal, as defined by at least one of the following criteria: * Age greater than or equal to 60 years; * Age less than 60 years and cessation of regular menses for at least 12 consecutive months with no alternative p...

Countries:United States
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Frequently asked questions about Palbociclib

What is Palbociclib used for in Female Breast Carcinoma?

Palbociclib is being studied for the treatment of female breast carcinoma, specifically in metastatic HER2-negative breast cancer. It is an investigational small molecule in Phase 2 clinical development, evaluated in combination with anastrozole in a controlled trial enrolling 40 female patients aged 18 years and older.

What does Palbociclib target?

Palbociclib targets cyclin-dependent kinases (CDKs), as indicated by its '-ciclib' drug class. It is a small molecule designed to inhibit CDK activity, which plays a role in cell cycle regulation. This mechanism is being explored in the context of metastatic HER2-negative breast cancer.

Who is developing Palbociclib?

Palbociclib is being developed by Atrium Therapeutics, Inc., a company traded under the ticker symbol RNA. The drug is currently in Phase 2 clinical development for female breast carcinoma, with an active clinical trial underway in the United States.

What phase is Palbociclib in?

Palbociclib is in Phase 2 clinical development. It is an investigational drug, not yet approved, and is being evaluated in an active but not recruiting clinical trial for metastatic HER2-negative breast cancer. The trial is a controlled, non-randomized, open-label study with a planned enrollment of 40 participants.

What clinical trials is Palbociclib in?

Palbociclib is being studied in clinical trial NCT02942355, titled 'Trial of Anastrozole and Palbociclib in Metastatic HER2-Negative Breast Cancer.' This Phase 2 trial is active but not recruiting, enrolling 40 female patients in the United States with female breast carcinoma or breast cancer. The study is biomarker-selected and controlled.