Hormone Replacement Therapy and the Risk of Breast Cancer Recurrence in Women With Previous Early Stage Breast Cancer

OBJECTIVES: * Evaluate the safety of hormone replacement therapy, in terms of risk of recurrence, in women with previously treated, nonrecurrent stage 0-II breast cancer. * Compare this regimen vs non-hormonal symptomatic treatment, in terms of quality of life and risk of death, in this patient population. OUTLINE: This is a randomized, open-label, multicenter study. Patients are stratified by center, prior hormone replacement therapy before diagnosis, and concurrent tamoxifen therapy. Patients are randomized to one of two treatment arms. * Arm I: Patients receive one of the following: Women with an intact uterus whose last menstrual bleeding has occurred within 2 years receive continuous oral cyclic estradiol-norethindrone combination comprising estradiol only on days 1-12, estradiol plus norethindrone on days 13-22, and then estradiol only on days 22-28. Women with an intact uterus whose last menstrual bleeding occurred more than 2 years prior to study receive continuous daily oral estradiol-norethindrone combination. Women who have had a hysterectomy receive continuous daily oral estradiol only. * Arm II: Patients receive one or more non-hormonal therapies (e.g., clonidine, beta blockers, psychological support, physical exercise, acupuncture). Treatment in both arms continues for 2 years in the absence of disease progression. Patients may continue their randomized treatment regimen at the discretion of the treating physician. Quality of life is assessed 3 times during the study and then every two years thereafter. Gynecological health is assessed at 3 months, 6 months, and one year during the study and then annually for at least 5 years. Breast cancer is assessed every 6 months for 3 years and then annually thereafter or at the discretion of the treating physician. PROJECTED ACCRUAL: A total of 1,300 patients will be accrued for this study within 5-6 years.