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Bone marrow amyloid in patients with M-component.

G Tosato, E Fagiolo

    Tumori
    |January 1, 1977
    PubMed
    Summary

    Amyloid substance was detected in bone marrow aspirates of patients with M-component related illnesses. Bone marrow involvement was more frequent than other sites, with Lambda light chains slightly more associated with amyloidosis.

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    Area of Science:

    • Hematology
    • Pathology
    • Immunology

    Background:

    • Amyloidosis is a condition characterized by the deposition of amyloid substance.
    • M-component, indicative of plasma cell dyscrasias, is often associated with amyloidosis.
    • The diagnostic utility of bone marrow aspirates in detecting amyloidosis requires further investigation.

    Purpose of the Study:

    • To investigate the presence and characteristics of amyloid substance in bone marrow aspirates from patients with M-component.
    • To compare the incidence of amyloidosis in patients with plasmacytoma versus other M-component associated illnesses.
    • To determine the association between light chain type (Lambda vs. K) and amyloidosis.

    Main Methods:

    • Bone marrow aspirates were collected from 28 patients with M-component.
    • Amyloid substance was detected using an intensively fluorescent staining method.
    • Patients had various associated illnesses including plasmacytoma, chronic lymphatic leukemia, lymphocytic lymphoma, benign monoclonal gammopathy, and liver cirrhosis.

    Main Results:

    • Amyloid was detected in 60% of plasmacytoma patients and 37.5% of patients with other illnesses.
    • Amyloidosis was found in 69.2% of cases with exclusive light chain production versus 40% with monoclonal complete Ig.
    • Lambda type light chain was slightly more often associated with amyloidosis (60%) than K type (52.9%).
    • Bone marrow involvement was more frequent than other elective sites like rectal mucosa.

    Conclusions:

    • Bone marrow aspirates are a valuable diagnostic tool for detecting amyloidosis in patients with M-component.
    • Amyloidosis detection rates vary depending on the underlying M-component associated illness and light chain type.
    • The intercellular deposition of amyloid in bone marrow is a key histopathological finding.

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