GRP and neoplasm: <b>The aim of the study</b> was to analyze the biodistribution of the BBN/C1-C2 molecule created on the basis of bombesin and knottin and its accumulation dynamics in the tumor in an <i>in vivo</i> model.<h4>Materials and methods</h4>The study analyzed the biodistribution of Cy7.5-labeled BBN/C1-C2 peptide based on bombesin and knottin U5-Sth1a and produced using solid-phase peptide synthesis.