In 2015, a strong and positive correlation between the binding of the specific GRPR-based radiotracer [111In]In-AMBA, (AMBA: DOTA-Gly-4-aminobenzoyl-BBN (7–14) (see Figure 4, 4)) and mRNA expression was demonstrated through in vitro autoradiography of clinical BC specimens. Here, GRPR is linked to breast cancer.