Breast Cancer PSMA PET

Prostate Specific Membrane Antigen (PSMA) is not only expressed in prostate cancer and its metastases, but also it is expressed on the neovasculature of many other solid tumors including gastric, lung, adrenal, bladder and renal cell carcinomas. Also, there is evidence that breast carcinomas express PSMA, although this has not been specifically studied in the metastatic TNBC. The study involves a total of 2 visits and on each visit, patients will undergo a PET imaging. Each patient will first undergo an (FDG) PET/CT and then in few days will undergo an 18F-DCFPyL-PET/CT. The PET scanner is a large machine with a hollow tube that will be used to see how F18 FDG is taken up into the tumor and other tissues. The patients will be asked to lie on the back on a special table that slides into the tube. The sides of the tube will be close to the body. At the first visit patients will be in this scanner for approximately 20 minutes. The study will evaluate the expression of PSMA via 18 F-DCFPyL-PET/CT in metastatic TNBC patients and compare it with lesion detection rate of FDG PET/CT. PSMA-avid lesions will be detected using the novel agent 18 F-DCFPyL and concordance rate with FDG-avid lesions will be calculated. The standardized uptake values (SUV) of each lesion on both FDG PET/CT and 18F-DCFPyL-PET/CT will be compared to find a correlation between tumor aggressiveness (lesion SUV on FDG PET/CT) and tumor angiogenesis (lesion SUV on 18 F-DCFPyL-PET/CT).