GRPR and neoplasm: When the %AD of the radiotracer bound to the FF tumor tissue was correlated with the mRNA receptor expression of the FF tumor material, a significant positive correlation was found for both GRPR (Spearman rs = 0.83, p = 0.0008) and SSTR2 (Spearman rs = 0.87, p = 0.0003) (Fig 1B+1D).