The usefulness of positron emission tomography/computed tomography (PET/CT) using (18F)-2-fluoropropionyl-labeled PEGylated dimeric arginine-glycine-aspartic acid peptide [PEG3-E{c(RGDyk)}2] (18F-FPPRGD2) in patients with metastatic renal cell cancer (mRCC) has not been evaluated; therefore, we were prompted to conduct this pilot study.
Seven patients with mRCC were enrolled in this prospective study. 18F-FPPRGD2 and 2-deoxy-2-(18F)fluoro-D-glucose (18F-FDG) PET/CT images were evaluated in a per-lesion analysis. Maximum standardized uptake value (SUVmax) and tumor-to-background ratio (T/B) were measured for all detected lesions, both before and after starting antiangiogenic therapy.
Sixty lesions in total were detected in this cohort. SUVmax from 18F-FPPRGD2 PET/CT was lower than that from 18F-FDG PET/CT (4.4 ± 2.9 vs 7.8 ± 5.6, P < 0.001). Both SUVmax and T/B from 18F-FPPRGD2 PET/CT decreased after starting antiangiogenic therapy (SUVmax, 4.2 ± 3.2 vs 2.6 ± 1.4, P = 0.003; T/B, 3.7 ± 3.2 vs 1.5 ± 0.8, P < 0.001). Average changes in SUVmax and T/B were - 29.3 ± 23.6% and - 48.1 ± 28.3%, respectively.
18F-FPPRGD2 PET/CT may be an useful tool for monitoring early response to antiangiogenic therapy in patients with mRCC. These preliminary results need to be confirmed in larger cohorts.
European journal of nuclear medicine and molecular imaging. 2019 Mar 08 [Epub ahead of print]
Akira Toriihara, Heying Duan, Holly M Thompson, Sonya Park, Negin Hatami, Lucia Baratto, Alice C Fan, Andrei Iagaru
Division of Nuclear Medicine and Molecular Imaging, Department of Radiology, Stanford University, 300 Pasteur Drive, Stanford, CA, 94305-5281, USA., Department of Nuclear Medicine, Kaiser Permanente, Santa Clara, CA, USA., Division of Oncology, Department of Medicine, Stanford University, 269 Campus Drive, Stanford, CA, 94305, USA. ., Division of Nuclear Medicine and Molecular Imaging, Department of Radiology, Stanford University, 300 Pasteur Drive, Stanford, CA, 94305-5281, USA. .