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Related Experiment Videos

IgM anticoagulant with acquired abnormalities in factor VIII.

W A Andes

    Thrombosis Research
    |September 15, 1982
    PubMed
    Summary

    A monoclonal IgM lupus anticoagulant was identified in a lymphoma patient, causing abnormal coagulation tests without bleeding. Chemotherapy resolved both the anticoagulant and coagulation abnormalities, suggesting the antibody acted as a disease marker.

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    Area of Science:

    • Hematology
    • Immunology
    • Oncology

    Background:

    • Investigating the clinical significance of lupus anticoagulants in patients with hematological malignancies.
    • Understanding the relationship between autoantibodies, coagulation abnormalities, and disease activity.

    Observation:

    • A 62-year-old man with lymphocytic lymphoma presented with prolonged prothrombin time and activated partial thromboplastin time, alongside multiple coagulation factor inhibitions.
    • Despite significant coagulation derangements, the patient experienced no abnormal bleeding.
    • A monoclonal IgM antibody with immediate-acting lupus anticoagulant properties was identified.

    Findings:

    • Chemotherapy led to clinical remission, normalization of coagulation parameters, and a dramatic decrease in IgM levels.
    • The patient's factor VIII related antigen (FVIIR:Ag) exhibited an abnormal electrophoretic pattern, with an anodal component that disappeared post-chemotherapy.
    • The IgM lupus anticoagulant did not directly affect normal FVIIR:Ag but was temporally associated with the patient's abnormal FVIIR:Ag.

    Implications:

    • Monoclonal IgM lupus anticoagulants can serve as valuable disease markers in certain cancers.
    • These findings highlight potential disparities between laboratory coagulation test results and actual hemostasis in clinical practice.
    • The study underscores the complex interplay between lymphoproliferative disorders, autoantibodies, and coagulation system function.

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