Immunologic and pharmacokinetic studies.

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Presentation transcript:

Immunologic and pharmacokinetic studies. Immunologic and pharmacokinetic studies. A, peripheral blood mononuclear cell (PBMC) analysis of a representative patient is shown. PBMCs were enriched from patient blood and collected at various times post-treatment. Flow cytometry was used to count cells expressing CD22, CD19, CD20, or CD3. B, a bioassay was used to determine the area under the curve (AUC) of serum DT2219 levels in serum by measuring the ability of diluted serum to inhibit proliferation of CD22+CD19+ Raji indicator cells. Drug serum levels at various times were analyzed using prism 5.0 software to calculate AUC. A concentration-time curve is shown for our second patient at 60 μg/kg. T1/2 was 59 minutes. C–F, DT2219 serum levels and neutralizing antibodies. C, a nonresponding patient treated at the 80 μg/kg dose level showing no evidence of DT2219 in serum. D, high levels of neutralizing antibodies in this same patient at day 8 through 22. In contrast, E shows the patient that completely responded to 60 μg/kg/day DT2219 had a serum drug concentration and F shows this same patient had no detectable neutralizing antibodies. DT2219 serum levels were calculated from assays in which various serum dilutions were tested for their ability to inhibit Raji cell proliferation. Serum collected prior to drug administration served as a negative control. Neutralization assays were performed based on the ability of undiluted patient serum samples to block the killing of a 99% inhibitory dose of DT2219. The percentage of neutralization was calculated. Veronika Bachanova et al. Clin Cancer Res 2015;21:1267-1272 ©2015 by American Association for Cancer Research