🏛️ Verified NIH Record • Updated 2026-06-10

Comparison of Fulvestrant (FASLODEX™) 250 mg and 500 mg in Postmenopausal Women With Oestrogen Receptor Positive Advanced Breast Cancer Progressing or Relapsing After Previous Endocrine Therapy. (NCT00099437)

A Randomised, Double-Blind, Parallel-group, Multicentre, Phase III Study Comparing the Efficacy and Tolerability of Fulvestrant (FASLODEX™) 500 mg With Fulvestrant (FASLODEX™) 250 mg in Postmenopausal Women With Oestrogen Receptor Positive Advanced Breast Cancer Progressing or Relapsing After Previous Endocrine Therapy

🔵 Active, Not Recruiting Phase3 💊 Investigational Drug / Biologic Sponsor: AstraZeneca

🩺 Plain-English Summary (8th-Grade Level)

The purpose of this study is to evaluate the efficacy of a new dose of 500 mg Fulvestrant with the standard dose of 250 mg in postmenopausal women with oestrogen receptor positive advanced breast cancer who have failed on a previous endocrine treatment.

Who can join: Review the eligibility criteria below.

Location: Research Site — Casa Grande, Arizona

Age range: 45 Years to 130 Years

🧪 Interventions in This Study

📋 "Do I Qualify?" — 1-Minute Self Screener

Instant Checklist

Full eligibility criteria are available on the official NIH protocol. View the criteria ↗

📍 All Participating Trial Locations (106 Sites)

Showing the first 25 of 106 sites.

  • Research Site — Casa Grande, Arizona
  • Research Site — Fountain Valley, California
  • Research Site — New Britain, Connecticut
  • Research Site — Crystal River, Florida
  • Research Site — Fort Lauderdale, Florida
  • Research Site — Urbana, Illinois
  • Research Site — Rosedale, Maryland
  • Research Site — Detroit, Michigan
  • Research Site — Kansas City, Missouri
  • Research Site — St Louis, Missouri
  • Research Site — Voorhees Township, New Jersey
  • Research Site — Greenville, North Carolina
  • Research Site — Pasadena, Texas
  • Research Site — West Bend, Wisconsin
  • Research Site — Brasschaat,
  • Research Site — Brussels,
  • Research Site — Brussels,
  • Research Site — Edegem,
  • Research Site — Ghent,
  • Research Site — Hasselt,
  • Research Site — Liège,
  • Research Site — Turnhout,
  • Research Site — Barretos,
  • Research Site — Londrina,
  • Research Site — Porto Alegre,

💰 Cost, Insurance & Patient Rights

  • 100% Free Items: The investigational treatment and protocol-required procedures are supplied at zero cost by the sponsor.
  • Routine Patient Care: Under federal law (ACA § 2709) and many state statutes, routine care costs are covered during participation.
  • Voluntary Participation: You may withdraw at any time without affecting your standard medical care.

Explore by condition: All Breast Cancer clinical trials

💡 How to Participate

  1. Check the checklist above to see if you may qualify.
  2. Review the official NIH record below to find the coordinating site.
  3. Ask about the visit schedule, what is covered at no cost, and any travel support.
  4. Confirm with your own doctor before making a decision.
🏛️ View Official NIH Record ↗