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Longer Response With Use of Fulvestrant Than Anastrozole in Advanced Breast Cancer

Longer Response With Use of Fulvestrant Than Anastrozole in Advanced Breast Cancer

ORLANDO—Compared with the aromatase inhibitor anastrozole (Arimi-dex),
mean duration of response is significantly greater with fulvestrant (Faslo-dex)
in postmenopausal women with advanced breast cancer who have progressed on
prior endocrine therapy. For other key endpoints, fulvestrant was at least as
effective as anastrozole, according to a poster presentation at the 38th
Annual Meeting of the American Society of Clinical Oncology (abstract 160).

Fulvestrant is an estrogen-receptor downregulator with no known agonist
activity, said Leroy M. Parker, MD, associate clinical professor of medicine,
Harvard Medical School, Dana-Farber Cancer Institute.

He reported on combined results from two randomized phase III multicenter
trials enrolling 851 patients: an open-label trial from centers in Europe,
South Africa, Australia enrolling 451 patients and a double-blind North
America trial enrolling 400 patients. In each trial, patients received either
monthly intramuscular injections of 250 mg fulvestrant or once-daily oral 1
mg anastrozole.

Included women were postmenopausal and hormone sensitive, and had received
no more than one prior endocrine treatment (including prior fulvestrant or
aromatase inhibitors). They had objective evidence of recurrence of disease
progression. Mean age was 63.4 years in both groups.

Previously presented findings at follow-up of 15.1 months had shown median
time to progression, the primary endpoint, to be 5.5 months for fulvestrant
and 4.1 months for anastrozole, with objective response rates of 19.2% and
16.5%, respectively. Dr. Parker presented updated results with a median of
22.1 months of follow-up.

[Separate reports on both studies with median follow-up of 16.8 months for
the US trial and 14.4 months for the European trial were recently published
in the August 15, 2002, issue of the Journal of Clinical Oncology.]

Efficacy Results

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