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Brief Title: Assessment of Functional Status of Estrogen Receptors in Breast Cancer by Positron Emission Tomography
Official Title: Assessment of Functional Status of Estrogen Receptors in Breast Cancer by Positron Emission Tomography
Study ID: NCT02455453
Brief Summary: The purpose of this study is to evaluate the uptake of a radioactive tracer 21-18F-fluoro-16α,17α-\[(R)-(1'-α-furylmethylidene)dioxy\]-19-norpregn-4-ene-3,20-dione (FFNP) uptake, which binds to breast cancer progesterone receptors (PgRs) on a PET/CT scan before and after administration of estradiol for one day (estrogen challenge) to determine if the change in uptake is a predictor of response to endocrine therapy (ET) in patients with hormone-sensitive estrogen receptor positive (ER+), human epidermal growth factor receptor 2-negative (HER2-) breast cancer. Estradiol is the most potent of the naturally occurring estrogens, and can be administered to treat menopausal symptoms and also sometimes to treat metastatic breast cancer. The investigators propose to study patients with biopsy-proven newly diagnosed, locally advanced, metastatic, or recurrent breast cancer who are going to be treated with endocrine therapy (ET) (tamoxifen,aromatase inhibitors or fulvestrant as standard of care therapy. Subjects will undergo a total of two FFNP-PET/CT scans; one before and a second one immediately following the one day estradiol challenge before the start of standard of care ET. The estradiol challenge will consist of administering a total of 6 mg of estradiol orally (three doses of 2 mg each) given at approximately 8 hour intervals and over a 24 hour period.
Detailed Description:
Minimum Age: 18 Years
Eligible Ages: ADULT, OLDER_ADULT
Sex: FEMALE
Healthy Volunteers: No
Washington University School of Medicine, Saint Louis, Missouri, United States
Name: Farrokh Dehdashti, M.D.
Affiliation: Washington University School of Medicine
Role: PRINCIPAL_INVESTIGATOR