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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Characterization of human IgG antimouse antibody in patients with B-cell malignancies.

PURPOSE: Immunotherapeutic approaches to cancer offer an attractive adjunct to conventional modalities, although human antiglobulin responses can be an obstacle to repeated treatment. This study of a large number of patients with B-cell malignancies, over an extended period of time, characterized their human antimouse antibody (HAMA) seroconversion. EXPERIMENTAL DESIGN: A total of 617 samples from 112 subjects were analyzed for HAMA titers. Eighty-five patients with B-cell malignancies; 12 breast cancer patients, and 15 volunteers were titered for comparison. Fifty-six B-cell malignancy patients were titered for HAMA throughout Lym-1 radioimmunotherapy (RIT); 29 were titered after a single imaging dose of Lym-1 antibody. RESULTS: Baseline titers did not correlate with subsequent HAMA seroconversion against Lym-1. Only 1 of 29 (3%) of the patients developed HAMA after an imaging dose of Lym-1. Of the RIT trial group, 37 of 56 (66%) never developed HAMA above baseline despite multiple doses. Of those who did (19 of 56; or 34%), the HAMA responses fell into two categories. Thirteen responded rapidly (median of 31 days) and were termed "early responders," whereas 6, termed "late responders," had a median response time of 111 days. Early responders developed higher peak HAMA titers with fewer exposures to Lym-1 and took longer to return to baseline than did the late responders. The frequency of new antiglobulin seroconversion decreased as the number of exposures increased. CONCLUSIONS: Seventy-seven percent of B-cell malignancy patients developed no response or a weak response after multiple doses of mouse Lym-1 antibody. Positive responders occurred in all histology types and fell into two categories differing in seroconversion time and titer, possibly indicative of the initial state of the immune system.[1]


  1. Characterization of human IgG antimouse antibody in patients with B-cell malignancies. DeNardo, G.L., Mirick, G.R., Kroger, L.A., Bradt, B.M., Lamborn, K.R., DeNardo, S.J. Clin. Cancer Res. (2003) [Pubmed]
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