GRPR and neoplasm: In T47D xenografts, the radiotracer showed high metabolic in vivo stability and prolonged GRPR-specific uptake (14.01 ± 2.87% IA/g at 1 h p.i. and 7.55 ± 1.81% IA/g at 24 h p.i. in the tumor and 130% IA/g at 1 h p.i. and approx. 2% IA/g at 24 h p.i. in the pancreas) (90).