SITE-SPECIFIC RADIOISOTOPE-LABELED ANTIBODY USING IgG-BINDING PEPTIDE

The present invention pertains to: an IgG-binding peptide containing a ligand which can be bound to a radioactive metal nuclide; an IgG-binding peptide labeled with a radioactive metal nuclide; a complex of the IgG-binding peptide with IgG; and a nuclear medical imaging diagnostic agent or a cancer diagnostic agent, etc., containing the IgG-binding peptide or the complex.