• J. Clin. Oncol. · Jun 2012

    Randomized Controlled Trial

    FACT: an open-label randomized phase III study of fulvestrant and anastrozole in combination compared with anastrozole alone as first-line therapy for patients with receptor-positive postmenopausal breast cancer.

    • Jonas Bergh, Per-Ebbe Jönsson, Elisabet Kerstin Lidbrink, Maureen Trudeau, Wolfgang Eiermann, Daniel Brattström, Justin P O Lindemann, Fredrik Wiklund, and Roger Henriksson.
    • Karolinska Institutet, Stockholm, Sweden. jonas.bergh@ki.se
    • J. Clin. Oncol. 2012 Jun 1; 30 (16): 1919-25.

    PurposeTo compare the effect of therapy with anastrozole versus a combination of fulvestrant and anastrozole in women in first relapse of endocrine-responsive breast cancer.Patients And MethodsPostmenopausal women, or premenopausal women receiving a gonadotropin-releasing hormone agonist, with estrogen receptor- and/or progesterone receptor-positive disease at first relapse after primary treatment of localized disease were open-label randomly assigned to a fulvestrant loading dose (LD) regimen followed by monthly injection plus 1 mg of anastrozole daily or to 1 mg of anastrozole daily alone. The primary end point was time to progression (TTP).ResultsIn all, 514 women were randomly assigned to fulvestrant plus anastrozole (experimental arm; n = 258) or anastrozole (standard arm; n = 256). Approximately two thirds had received adjuvant antiestrogens, but only eight individuals had received an aromatase inhibitor. Median TTP was 10.8 and 10.2 months in the experimental versus standard arm, respectively (hazard ratio [HR] = 0.99; 95% CI, 0.81 to 1.20; P = .91); median overall survival was 37.8 and 38.2 months, respectively (HR = 1.0; 95% CI, 0.76 to 1.32; P = 1.00). Incidences of prespecified adverse events (AEs) were similar. Hot flashes were more common in the experimental arm: 63 patients (24.6%) versus 35 patients (13.8%) in the standard arm (P = .0023). Death owing to AEs was reported in 11 (4.3%) and five patients (2.0%) in the experimental versus standard arm, respectively.ConclusionFulvestrant (250 mg + LD regimen) in combination with anastrozole offered no clinical efficacy advantage over anastrozole monotherapy in this population of individuals with a relatively high proportion of previous adjuvant antiestrogen exposure.

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