Fluciclovine and PSMA PET/CT for the Classification and Improved Staging of Invasive Lobular Breast Cancer

Overview

This phase I trial studies how well fluciclovine positron emission tomography (PET)/computed tomography (CT) and PSMA PET/CT work in helping doctors understand and classify invasive lobular breast cancer in patients with invasive lobular breast cancer that is suspicious for or has spread to other places in the body (metastasized). Fluciclovine and PSMA are radiotracers used in PET/CT imaging scans that emit radiation. The PET/CT scan than picks up the radiation being released to create a picture from within the body. Information learned from this study may help researchers learn how to better identify metastatic disease in invasive lobular breast cancer patients which will impact appropriate staging.

PRIMARY OBJECTIVES: I. Improve detection of metastasis with fluciclovine F18 (fluciclovine) and gallium Ga 68-labeled PSMA-11 (PSMA) PET versus best standard of care conventional imaging, as confirmed with histology. II. Determine concordance and discordance of invasive lobular breast cancer (ILC) detection with PSMA versus fluciclovine PET, as confirmed with histology. EXPLORATORY OBJECTIVE: I. Establish the role of circulating tumor deoxyribonucleic acid (DNA) (ctDNA) directed to ESR1 and PI3K DNA in characterizing the degree of tumor burden as identified by metabolic amino acid transport and tumor neovasculature receptor imaging. OUTLINE: Patients receive gallium Ga 68-labeled PSMA-11 intravenously (IV) and undergo a PET/computed tomography (CT) scan over 30 minutes. On a separate day, patients receive fluciclovine F18 IV and undergo a PET/CT scan over 30 minutes. After completion of study, patients are followed up in 5-10 business days, and then up to 5 years.