In the study by Prignon et al. [86], GRPR-mediated imaging was compared to 18F-FDG PET for tumor visualization and disease monitoring after endocrine therapy, resulting in a significant decrease in uptake of the GRPR radiotracer, 68Ga-AMBA, in treated and non-treated animals while no significant difference in 18F-FDG uptake between the treated and non-treated group was observed. Here, GRPR is linked to neoplasm.