a study on Breast Cancer
RATIONALE: Estrogen can cause the growth of breast cancer cells. Hormone therapy using letrozole may fight breast cancer by lowering the amount of estrogen the body makes. It is not yet known whether letrozole is more effective than a placebo in treating patients with hormone receptor-positive breast cancer.
PURPOSE: This randomized phase III trial is studying letrozole to see how well it works compared with a placebo in treating postmenopausal women who have received hormone therapy for hormone receptor-positive breast cancer.
A Clinical Trial to Determine the Efficacy of Five Years of Letrozole Compared to Placebo in Patients Completing Five Years of Hormonal Therapy Consisting of an Aromatase Inhibitor (AI) or Tamoxifen Followed by an AI in Prolonging Disease-Free Survival in Postmenopausal Women With Hormone Receptor Positive Breast Cancer
OUTLINE: This is a double-blind, multicenter, placebo-controlled, randomized study. Patients are stratified according to pathologic nodal status (negative vs positive), adjuvant tamoxifen citrate therapy (yes vs no), and lowest bone mineral density T score for lumbosacral spine, total hip, or femoral neck (> -2.0 vs ≤ -2.0 standard deviation). Patients are randomized to 1 of 2 treatment arms.
In both arms, treatment continues for up to 5 years in the absence of disease progression or unacceptable toxicity.
After completion of study treatment, patients are followed annually.
PROJECTED ACCRUAL: A total of 3,840 patients will be accrued for this study.
Breast Cancer stage I breast cancer stage II breast cancer stage IIIA breast cancer Hormones Letrozole
For females ages 18 years to 120 years
within 2 years for all other patients.
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