For instance, in the T47D cell line in vivo, the radiotracer [99mTc]Tc‐DB 15 (N4‐AMA‐DGA‐[DPhe6‐Sar11‐Leu13‐NHEt] BBN (6–14)) demonstrated excellent metabolic stability and enhanced GRPR‐specific uptake in breast tumours [167]. Here, GRPR is linked to breast neoplasm.