Bispecific and oligospecific mono- and oligovalent...

C - Chemistry – Metallurgy – 12 – N

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167/103, 167/129

C12N 15/62 (2006.01) A61K 39/395 (2006.01) C07K 16/30 (2006.01) C07K 16/46 (2006.01) C12N 15/13 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2019559

The invention relates to bispecific and oligospecific, mono- and oligovalent receptors which are prepared by gene manipulation by fusion of DNA coding for F(ab) fragments of antibodies of two or more different specificities by means of suitable linkers. In this connection, one specificity is preferably directed either against an epitope, which is located on the cell membrane or in the interstitium, of a tumor-associated antigen (TAA) or against an epitope in the tumor endothelium (TE), while the other specificities relate to highmolecular or low- molecular weight ligands and react, for example, with the Komplexons ethylenediaminetetraacetate and diethylenetriaminepentaacetate in Y90 complexed-form (EDTA-Y90 and DTPA-Y90 respectively). In a particularly preferred embodiment, the binding with the Komplexons takes place on the Komplexon receptor arm via fos-jun interaction (or else avidin-biotin interaction). Other preferred specificities have catalytic properties.

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