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- W2024241872 abstract "The development of antibodies to asparaginase may attenuate the pharmacologic effect of asparaginase treatment, may be associated with hypersensitivity reactions, and may necessitate switching to a different commercial asparaginase preparation for current or future therapy. Thus, development of an ELISA for measurement of anti-asparaginase antibody levels is important in the clinical setting. An anti-asparaginase antibody reference was established by screening 65 plasma samples from six patients with acute lymphoblastic leukemia (ALL) who had recently developed a hypersensitivity reaction to Escherichia coli or Erwinia chrysanthemi asparaginase therapy. Twenty-one plasma samples were selected for the anti-asparaginase antibody reference pool. Five micrograms per milliliter of commercial E. coli and Erwinia asparaginase and 10 microg/ml of E. coli asparaginase conjugated with polyethylene glycol (PEG asparaginase) were found to be optimal as coating antigen concentrations. Anti-asparaginase antibody concentrations were determined using a commercial polyclonal goat anti-human IgG horseradish peroxidase conjugate. The antibody reference curves were linear in a range of absorbance from 0.1 to 1. 5 O.D. units for dilutions from 1:1600 to 1:51,200. Inter-assay coefficients of variation were 9.04, 14.7 and 13.0%, and intra-assay coefficients of variation were 1.44, 4.43 and 3.28% for antibodies against E. coli, Erwinia, and PEG L-asparaginase, respectively. The cut-off for positivity in plasma was determined as mean+2 S.D. of the optical density values for plasma from untreated healthy volunteers. Measurement of specific IgG by this ELISA allows for the evaluation of plasma anti-asparaginase antibody concentrations in patients receiving one or more of the multiple commercial L-asparaginase preparations." @default.
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- W2024241872 date "2000-05-01" @default.
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- W2024241872 title "ELISA to evaluate plasma anti-asparaginase IgG concentrations in patients with acute lymphoblastic leukemia" @default.
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- W2024241872 doi "https://doi.org/10.1016/s0022-1759(00)00182-4" @default.
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