Abstract
Monoclonal rat anti-idiotypic antibody (Ab2) BR3E4 mimicking the colorectal carcinoma (CRC)-associated epitope CO17-1A induced antigen-specific humoral and cellular immune responses in mice and rabbits. Ab2 BR3E4 was administered in a phase I trial to CRC patients either as intact IgG or as F(ab′) 2 coupled to keyhole limpet hemocyanin (KLH). There was a trend for the F(ab′) 2-KLH-immunized patients to show higher immune response rates (18/21 and 5/15 patients with anti-anti-idiotypic antibodies and T cells, respectively) than the IgG-immunized patients (15/23 and 3/15 patients positive). Clinical responses were rare in these patients with liver metastases.
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