Volume 49, Issue 6 pp. 1050-1058

Investigation of whether the acute hemolysis associated with Rho(D) immune globulin intravenous (human) administration for treatment of immune thrombocytopenic purpura is consistent with the acute hemolytic transfusion reaction model

Ann Reed Gaines

Ann Reed Gaines

From the Office of Biostatistics and Epidemiology, the Office of Blood Research and Review, and the Office of Cellular, Tissue and Gene Therapies, Center for Biologics Evaluation and Research, Food and Drug Administration, Rockville, Maryland; the Department of Transfusion Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland; and the Division of Laboratory and Transfusion Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts.

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Hallie Lee-Stroka

Hallie Lee-Stroka

From the Office of Biostatistics and Epidemiology, the Office of Blood Research and Review, and the Office of Cellular, Tissue and Gene Therapies, Center for Biologics Evaluation and Research, Food and Drug Administration, Rockville, Maryland; the Department of Transfusion Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland; and the Division of Laboratory and Transfusion Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts.

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Karen Byrne

Karen Byrne

From the Office of Biostatistics and Epidemiology, the Office of Blood Research and Review, and the Office of Cellular, Tissue and Gene Therapies, Center for Biologics Evaluation and Research, Food and Drug Administration, Rockville, Maryland; the Department of Transfusion Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland; and the Division of Laboratory and Transfusion Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts.

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Dorothy E. Scott

Dorothy E. Scott

From the Office of Biostatistics and Epidemiology, the Office of Blood Research and Review, and the Office of Cellular, Tissue and Gene Therapies, Center for Biologics Evaluation and Research, Food and Drug Administration, Rockville, Maryland; the Department of Transfusion Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland; and the Division of Laboratory and Transfusion Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts.

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Lynne Uhl

Lynne Uhl

From the Office of Biostatistics and Epidemiology, the Office of Blood Research and Review, and the Office of Cellular, Tissue and Gene Therapies, Center for Biologics Evaluation and Research, Food and Drug Administration, Rockville, Maryland; the Department of Transfusion Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland; and the Division of Laboratory and Transfusion Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts.

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Ellen Lazarus

Ellen Lazarus

From the Office of Biostatistics and Epidemiology, the Office of Blood Research and Review, and the Office of Cellular, Tissue and Gene Therapies, Center for Biologics Evaluation and Research, Food and Drug Administration, Rockville, Maryland; the Department of Transfusion Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland; and the Division of Laboratory and Transfusion Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts.

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David F. Stroncek

David F. Stroncek

From the Office of Biostatistics and Epidemiology, the Office of Blood Research and Review, and the Office of Cellular, Tissue and Gene Therapies, Center for Biologics Evaluation and Research, Food and Drug Administration, Rockville, Maryland; the Department of Transfusion Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland; and the Division of Laboratory and Transfusion Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts.

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First published: 01 June 2009
Citations: 13
Ann Reed Gaines, Office of Biostatistics and Epidemiology (HFM-220), Center for Biologics Evaluation and Research, Food and Drug Administration, 1401 Rockville Pike, Rockville, MD 20852; e-mail: [email protected].

The article was produced by employees of the United States Government and Beth Israel Deaconess Medical Center/Harvard Medical School as part of their official duties.

The content of this publication does not necessarily reflect the views or polices of the U.S. Department of Health and Human Services, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. government.

None of the authors has financial interest in Cangene Corporation, the company whose product was studied in the present work, or in any other company(ies) whose products were mentioned in this article. This study was not supported by research funding from Cangene or any other entity.

Abstract

BACKGROUND: Immune thrombocytopenic purpura and secondary thrombocytopenia patients treated with Rho(D) immune globulin intravenous (human; anti-D IGIV) have experienced acute hemolysis, which is inconsistent with the typical presentation of extravascular hemolysis—the presumed mechanism of action of anti-D IGIV. Although the mechanism of anti-D-IGIV–associated acute hemolysis has not been established, the onset, signs/symptoms, and complications appear consistent with the intravascular hemolysis of acute hemolytic transfusion reactions (AHTRs). In transfusion medicine, the red blood cell (RBC) antigen-antibody incompatibility(-ies) that precipitate AHTRs can be detected in vitro with compatibility testing. Under the premise that anti-D-IGIV–associated acute hemolysis results from RBC antigen-antibody–mediated complement activation, this study evaluated whether the incompatibility(-ies) could be detected in vitro with a hemolysin assay, which would support the AHTR model as the hemolytic mechanism.

STUDY DESIGN AND METHODS: Seven anti-D IGIV lots were tested to determine the RBC antibody identities in those lots, including four lots that had been implicated in acute hemolytic episodes. Hemolysin assays were performed that tested each of 73 RBC specimens against each lot, including the RBCs of one patient who had experienced acute hemolysis after anti-D IGIV administration.

RESULTS: Only two anti-D IGIV lots contained RBC antibodies beyond those expected. No hemolysis endpoint was observed in any of the hemolysin assays.

CONCLUSION: Although the findings did not support the AHTR model, the results are reported to contribute knowledge about the mechanism of anti-D-IGIV–associated acute hemolysis and to prompt continued investigation into cause(s), prediction, and prevention of this potentially serious adverse event.

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