“…The biologically active sequence is the C-terminal part NT(8–13) (Arg-Arg-Pro-Tyr-Ile-Leu) [2] which binds to the three neurotensin receptor subtypes NTS1, NTS2, NTS3 [3] and has therefore been selected as a lead structure for medicinal chemists [4,5,6,7,8,9,10,11,12,13]. The NTS1 is upregulated in various tumor types including prostate, pancreas, mamma, lung and colon carcinoma [14,15,16].…”