Study of 18F-FFNP Breast PET/MRI

Exclusion Criteria19

• Inability or unwillingness to provide informed consent to the study
• HER2-positive breast cancer, as defined by immunohistochemical staining 3+ OR positive by in situ hybridization (Group 2 only)
• PR and Ki67 IHC slides or FFPE tissue blocks from clinical breast biopsy not available
• Patients who have completed neoadjuvant chemotherapy, endocrine therapy, targeted therapy, surgical resection, or radiation for the current biopsy-proven malignancy
• Patients who are planning to undergo anastrozole as standard of care neoadjuvant therapy
• Patients who are currently taking aromatase inhibitors or ER antagonists (tamoxifen, raloxifene)
• Patients with breast expanders
• Patients who are pregnant or lactating
• Patients with a contraindication to gadolinium-based contrast agents, including allergy or impaired renal function (per UW Health Guidelines)
• Patients with a history of allergic reaction attributable to compounds of similar chemical or biologic composition to 18F-FFNP
• Patients with history of allergic reaction to anastrozole (Group 2 only)
• Patients in liver failure as judged by the patient's physician
• Patients with standard contraindications to MRI (per UW Health Guidelines)
• Patients requiring conscious sedation for imaging are not eligible; patients requiring mild, oral anxiolytics for the clinical MRI scan will be allowed to participate as long as the following criteria are met:
• The patient has their own prescription for the medication
• The informed consent process is conducted prior to the self-administration of the medication.
• The patient comes to the research visit with a driver.
• Patients unable to lie prone for 45 minutes for imaging
• Patients taking hormone replacement therapy or over-the-counter products/supplements/herbal preparation with potential estrogenic effects who are unwilling to discontinue these agents during the timeframe of the study until surgery.