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.
铼或
锝放射性同位素标记的螯合六肽复合物对于选择性检测或治疗具有
生长抑素受体的肿瘤非常有用。特别是,具有公式:##STR1##(其中R,R.sup.1,R.sup.3和A的定义如本文所述)的化合物可以用N3S2螯合物标记放射性同位素。所得到的复合物可用作放射性成像剂或放射性药物,用于治疗某些肿瘤。