GLP1R and neoplasm: On the other hand, BnDTPA-Ex(9-39) (BnDTPA coupled at the N-terminus) showed a higher tumor uptake than [Lys40([111In]In-DTPA)]Ex(9-39) [189,191], a result most probably generated by the much lower peptide dose used in the latter study (below the GLP-1R saturability range of the experimental tumor).