The blocking of GRPR in tumour-bearing mice resulted in a significantly reduced activity uptake in the pancreas (4 ± 1% IA/g, P < 0.01, n = 4) and tumours (1.3 ± 0.6% IA/g, P < 0.01, n = 4) and the results are shown in Fig. 4 and Suppl. This evidence concerns the gene GRPR and neoplasm.