CHGA and neoplasm: Spearman’s rank correlation analysis was performed to determine a correlation between MTV and TLU on [18F]SiTATE-PET/CT with hormone secretion and the tumor marker chromogranin A. There was a significant correlation of the tumor marker chromogranin A with MTV (r = 0.570, p = 0.001) and TLU (r = 0.608, p < 0.001).