Akzo N.v.

Franciscus M Kaspersen

Ebo S Bos

Maurits Willem Geerlings

Petrus J Boon

This invention relates to the field of immune therapy of cancer, more specifically to immunoconjugates of a cytotoxic moiety with a targeting moiety, more specifically to immunoconjugates of antibodies or fragments or functional derivatives of antibodies coupled to a cytotoxic substance such as drugs, toxins or radioisotopes. It especially relates to the release of substances bound to a targeting moiety through the use of acid-cleavable linker molecules.

Acid-labile linker molecules

The present invention relates to the use of Actinium or one of its daughters in radioimmunotherapy. Also provided are immunoconjugates comprising an isotope, a chelating agent and a slowly localizing antibody. The invention also includes pharmaceutical compositions comprising said immunoconjugates, as well as such compositions comprising one or more scavenging agents. The compositions according to the invention are particularly useful for the treatment of micrometastases in adjuvant therapy, as well as for treatment of localized tumors.

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Heesch, Netherlands

Franciscus M Kaspersen