Recent Updates
Recently added Catalysts

faslodex

Phase 3

Hormone Receptor Positive Breast Cancer | Small molecule | Oncology |AstraZeneca PLC|Last Updated: Feb 27, 2026

Success Probability

Subscribe to view

Market & Valuation

Subscribe to view

Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLED
Total Trials1
Total Enrollment462

FDA Designations

No designations recorded

Clinical trial landscape

faslodex · 1 trial · 1 indication

Phase 3 1
NCT01602380A Global Study to Compare the Effects of Fulvestrant and Arimidex in a Subset of Patients With Breast Cancer.Hormone Receptor Positive Breast Cancer
COMPLETED462 Analytics
PHASE3COMPLETED
A Global Study to Compare the Effects of Fulvestrant and Arimidex in a Subset of Patients With Breast Cancer.
Hormone Receptor Positive Breast CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Comparison of Progression-Free Survival (PFS) in Patients Treated With Fulvestrant With Those Treated With Anastrozole
Baseline RECIST 1.1 assessments (Day 0) and then every 12 weeks until the earliest of disease progression evident, patient dies or has surgery/radiotherapy for their disease (up to approximately 38 months)

PFS was defined as the time from randomisation until objective disease progression according to Response Evaluation Criteria in Solid Tumours version 1.1 (RECIST 1.1), surgery or radiotherapy to manage worsening of disease or death by any cause (in the absence of progression). Outcome measure is reported as median time from randomisation to PFS, calculated using the Kaplan-Meier technique.

Secondary Endpoints

Comparison of Overall Survival (OS) in Patients Treated With Fulvestrant With Those Treated With Anastrozole; Percentage of Patients With Events
Baseline (Day 0) up to data cut-off for final analysis (up to approximately 116 months). Following disease progression, patients were to be contacted at 12 weekly intervals to determine survival status
Objective Response Rate (ORR) for Fulvestrant Treatment Versus Anastrozole Treatment
Baseline RECIST 1.1 assessments (Day 0) and then every 12 weeks until disease progression or treatment discontinuation (up to approximately 38 months)
Duration of Response (DoR) for Fulvestrant Treatment Versus Anastrozole Treatment
Baseline RECIST 1.1 assessments (Day 0) and then every 12 weeks until disease progression or treatment discontinuation (up to approximately 38 months)
Unlock Study Endpoints

Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
faslodex+placeboEXPERIMENTALBlinded: Fulvestrant 500mg intramuscular injection (2x250mg) plus dummy Anastrozole tablets
arimidex +placeboACTIVE_COMPARATORBlinded: Anastrozole 1mg tablets plus dummy Fulvestrant intramuscular injection (2x0mg)

Interventions

NameTypeDescription
faslodex 500mgDRUG2 x intramuscular injections at day 1, 14, 28 and every 28 days thereafter
arimidex 1mgDRUGoral tablet 1 daily
faslodex dummyDRUG2 x intramuscular injections at day 1, 14, 28 and every 28 days thereafter
arimidex dummyDRUGoral tablet 1 daily
Unlock Study Design Details

Eligibility Criteria

Age Range18 Years to 130 Years
SexFEMALE
Healthy VolunteersNo
Study Sites118

Inclusion Criteria: * Histological confirmation of breast cancer in post menopausal women (age \>=60). Positive hormone receptor status (ER +ve and/or PgR +ve) of primary or metastatic tumour tissue based on local laboratory assessment. * EITHER locally advanced disease (1 line of chemotherapy allo...

Countries:United StatesArgentinaBrazilCanadaChinaCzechiaItalyJapanMexicoPeruPolandRomaniaRussiaSlovakiaSouth AfricaSpainTaiwanTurkey (Türkiye)UkraineUnited Kingdom
Unlock Eligibility Criteria

Frequently asked questions about faslodex

What is Faslodex used for?

Faslodex is used for the treatment of hormone receptor positive breast cancer. It is an investigational small molecule being developed by AstraZeneca PLC (AZN) and is currently in Phase 3 clinical development.

What does Faslodex target?

Faslodex targets the estrogen receptor in hormone receptor positive breast cancer. It is a small molecule designed to interfere with estrogen receptor signaling, which is relevant to the growth of hormone receptor positive tumors.

Who makes Faslodex?

Faslodex is being developed by AstraZeneca PLC, a biopharmaceutical company listed on the stock exchange under the ticker AZN.

What phase is Faslodex in?

Faslodex is in Phase 3 clinical development. It is an investigational drug and has not been approved by regulatory authorities. One Phase 3 trial has been completed.

What clinical trials is Faslodex in?

Faslodex has been studied in a Phase 3 clinical trial identified as NCT01602380. This trial compared fulvestrant, the active ingredient in Faslodex, with Arimidex in a subset of patients with hormone receptor positive breast cancer. The trial enrolled 462 female participants and has been completed.

Is Faslodex the same as fulvestrant?

Faslodex is the brand name for fulvestrant. The clinical trial NCT01602380 refers to fulvestrant as the investigational drug, and Faslodex is the proprietary name under which it is being developed.