Trial Parameters
Brief Summary
This clinical trial will investigate an estrogen-regulated parameter as an early measure of endocrine therapy response: progesterone receptor (PR) protein with a progestin-based radioligand, 18F-fluorofuranylnorprogesterone (18F-FFNP). The overall purpose of this research is to test the efficacy of 18F-FFNP PET/MRI for predicting response to presurgical endocrine therapy and to determine the quantitative reliability of 18F-FFNP breast PET/MRI in patients with newly diagnosed PR+ primary breast cancer.
Eligibility Criteria
Inclusion Criteria: * Postmenopausal status defined by either * prior bilateral oophorectomy * age greater than or equal to 60 years of age * age less than 60 years of age and amenorrheic for 12 or more months in the absence of prior chemotherapy, tamoxifen, toremifene or ovarian suppression and FSH and estradiol in the postmenopausal range per local normal range (Group 2 only) * Diagnosis of biopsy-proven invasive breast cancer measuring at least 1.0 cm in diameter by any imaging modality * Biopsy-proven PR-positive invasive breast cancer * Breast MRI planned or performed before surgery * Definitive surgical excision of the primary tumor planned without neoadjuvant therapy; defined as therapy (chemotherapy, targeted therapy, radiation therapy or endocrine therapy) given to decrease the size of the tumor prior to planned surgery. Exclusion Criteria: * Inability or unwillingness to provide informed consent to the study * HER2-positive breast cancer, as defined by immunohistochemical sta