TC or RE radionuclide labelled chelate, hexapeptide complexes useful for diagnostic or therapeutic applications

摘要

Technetium or rhenium radionuclide labelled chelate- hexapeptide complexes are useful for the selective detection or treatment of tumors with somatostatin receptors. In particular, compounds of formula: ##STR1## (wherein R, R.sup.1, R.sup.3 and A are as defined herein) incorporating an N3S2 chelate may be labelled with a radionuclide. The resulting complexes are useful as radioimaging agents or as radiopharmaceuticals for the treatment of certain tumors.