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faslodex

Phase 3

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

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindACTIVE_CONTROLLEDBiomarker
Total Trials1
Total Enrollment462
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT01602380A Global Study to Compare the Effects of Fulvestrant and Arimidex in a Subset of Patients With Breast Cancer.PHASE3 COMPLETED 462Oct 17, 2012Jan 16, 2026Feb 27, 2026118 United States, Argentina +18
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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)
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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
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Eligibility Criteria
Age Range18 Years — 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
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Recent Changes (Last 90 Days)
MEDIUMApr 8, 2026NCT01602380TRIAL_REMOVED: changed
MEDIUMApr 8, 2026NCT01602380TRIAL_REMOVED: changed