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Brief Title: Low-Dose Tamoxifen Citrate in Reducing Breast Cancer Risk in Radiation-Induced Cancer Survivors
Official Title: Low-Dose Tamoxifen for Radiation-Induced Breast Cancer Risk Reduction: A Phase IIB Randomized Placebo-Controlled Trial
Study ID: NCT01196936
Brief Summary: Estrogen can cause the growth of breast cancer cells. Hormone therapy using tamoxifen citrate may fight breast cancer by blocking the use of estrogen by the tumor cells This phase IIb trial studies how well low-dose tamoxifen citrate works in reducing breast cancer risk in radiation-induced cancer survivors.
Detailed Description: PRIMARY OBJECTIVES: I. To determine the impact of a two-year course of low-dose tamoxifen (tamoxifen citrate) administered at 5 mg per day on surrogate endpoint biomarkers of breast cancer (BC) risk, including: mammographic breast density (MBD), an established radiographic biomarker of BC risk; cytomorphology and proliferative index, tissue biomarkers closely linked to BC risk; and sex steroid hormones and insulin growth factors, circulating biomarkers of BC risk. II. To establish safety and tolerability of this low-dose tamoxifen regimen, assessing both objective measures (lipid profiles, clotting factors and bone metabolism markers) and patient-reported outcomes. III. To examine the modifying effect of demographic, clinical, and molecular characteristics on the risk: benefit ratio from this two-year low dose tamoxifen intervention. IV. To explore the relationship between this low-dose tamoxifen regimen and clinical measures of efficacy (new breast cancer and ductal carcinoma in situ \[DCIS\] diagnoses) and toxicity (thromboembolic events, reports of hot flashes and gynecological symptoms, liver function abnormalities, and other cancer diagnoses). OUTLINE: Patients are randomized to 1 of 2 treatment arms. ARM I: Patients receive tamoxifen citrate orally (PO) once daily for 24 months in the absence of disease progression or unacceptable toxicity. ARM II: Patients receive placebo PO once daily for 24 months in the absence of disease progression or unacceptable toxicity. After completion of study treatment, patients are followed up periodically for up to 10 years.
Minimum Age: 25 Years
Eligible Ages: ADULT, OLDER_ADULT
Sex: FEMALE
Healthy Volunteers: No
University of Alabama at Birmingham, Birmingham, Alabama, United States
City of Hope Medical Center, Duarte, California, United States
University of Colorado, Anschutz Medical Campus, Aurora, Colorado, United States
University of Chicago, Chicago, Illinois, United States
Dana-Farber Cancer Institute, Boston, Massachusetts, United States
University of Michigan, Ann Arbor, Michigan, United States
University of Minnesota, Minneapolis, Minnesota, United States
Mayo Clinic, Rochester, Minnesota, United States
Wake Forest University, Winston-Salem, North Carolina, United States
St. Jude Children's Research Hospital, Memphis, Tennessee, United States
MD Anderson, Houston, Texas, United States
Seattle Cancer Care Alliance, Seattle, Washington, United States
University Health Network, Toronto, Toronto, Ontario, Canada
Name: Smita Bhatia, MD
Affiliation: University of Alabama at Birmingham
Role: PRINCIPAL_INVESTIGATOR