ADCYAP1R1 and neoplasm: Accumulation in both tumor and pancreas could be blocked by an excess of unlabeled maxadilan, demonstrating specific uptake of the peptides via the PAC1 receptor (1.54 ± 0.49%ID/g and 1.24 ± 0.48%ID/g for maxadilan-DTPA-111In and 111In-DTPA-maxadilan respectively in tumor tissue and 0.59 ± 0.07%ID/g and 0.43 ± 0.04%ID/g respectively for pancreatic uptake).