Abstract:
:We have examined three methods that may be useful for improving the therapeutic efficacy of antibody-targeted radionuclides. The principal limitation of radioimmunotherapy is myelotoxicity and thrombocytopenia. These are due mainly to the length of time the radioantibody remains in the blood. The clearance time of a radiolabeled immunoglobulin G (IgG) may be decreased by using fragments prepared from the IgG. Using murine monoclonal antibodies against human colonic cancer in an animal model with a transplantable human colonic tumor, we have shown that fractionated doses of 131I-labeled F(ab')2 fragments can provide similar tumoricidal activity as a single injection of IgG, but toxicity to the normal tissues is reduced significantly at this tumoricidal level. Thus, it is expected that improved tumoricidal activity may be achieved by further escalating the dose of F(ab')2 that is administered at each injection. An anti-antibody (second antibody) may also be used to remove an anti-tumor antibody rapidly from the blood. By allowing intact IgG to be used instead of fragments, a higher percentage of the radiolabeled anti-tumor antibodies may be concentrated in the tumor to provide higher tumor doses, yet toxicity to the normal tissues may be controlled by the removal of the radiolabeled antibody from the blood. We have shown that the injection of a second antibody 48 h after 131I-labeled anti-carcinoembryonic antigen antibody is given can reduce toxicity at least 2-fold without affecting the tumoricidal activity of the radioantibody. A third method for reducing the myelotoxicity of radioantibody treatment involves the use of cytokines to increase the production of white blood cells. For example, interleukin 1 may be given prior to, or sometime after, radioantibody treatment to increase the number of circulating white blood cells and thereby reduce myelotoxicity. Thus, modification of some of the biological factors limiting radioimmunotherapy may provide for improvements in cancer treatment with radiolabeled antibodies.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Sharkey RM,Blumenthal RD,Hansen HJ,Goldenberg DMsubject
Has Abstractpub_date
1990-02-01 00:00:00pages
964s-969sissue
3 Suppleissn
0008-5472issn
1538-7445journal_volume
50pub_type
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