IgM multiple myeloma: Pathologic evaluation of a rare entity

Rebecca King, Matthew T. Howard, Janice M. Hodnefield, William G. Morice

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Objectives: To delineate the pathology of immunoglobulin M-producing multiple myeloma (IgM MM). Methods: Clinicopathologic data were reviewed for 15 cases meeting World Health Organization criteria for MM and having a serum IgM paraprotein. Immunohistochemistry was performed on diagnostic bone marrow specimens for common B-cell and plasma cell markers. Results: Of the 15 IgM MM bone marrows reviewed, 6 (40%) had lymphoplasmacytoid cytology, and 12 (80%) expressed CD19, CD20, and/or CD45. Cyclin D1 expression was common (11 cases, 73%) and usually associated with t(11;14). No cases expressed CD5 or had an associated CD5-positive B-cell population. CD117 was positive in 20% of cases. Conclusions: The frequent B-cell-associated antigen expression by IgM MM distinguishes it from other MM types, causing significant pathologic overlap with lymphoplasmacytic lymphoma (LPL). However, IgM MM is usually distinguished from LPL by aberrant cyclin D1 expression or t(11;14). Therefore, assessing for these abnormalities is recommended when evaluating bone marrow involvement by IgM-associated lymphoplasmacytoid disorders.

Original languageEnglish (US)
Pages (from-to)519-524
Number of pages6
JournalAmerican journal of clinical pathology
Volume140
Issue number4
DOIs
StatePublished - Oct 1 2013
Externally publishedYes

Fingerprint

Multiple Myeloma
Immunoglobulin M
B-Lymphocytes
Bone Marrow
Cyclin D1
Lymphoma
Paraproteins
Plasma Cells
Cell Biology
Immunohistochemistry
Pathology
Antigens
Serum
Population

Keywords

  • Cyclin D1
  • IgM multiple myeloma
  • Immunophenotype
  • Lymphoplasmacytic lymphoma
  • Pathology

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

Cite this

IgM multiple myeloma : Pathologic evaluation of a rare entity. / King, Rebecca; Howard, Matthew T.; Hodnefield, Janice M.; Morice, William G.

In: American journal of clinical pathology, Vol. 140, No. 4, 01.10.2013, p. 519-524.

Research output: Contribution to journalArticle

King, Rebecca ; Howard, Matthew T. ; Hodnefield, Janice M. ; Morice, William G. / IgM multiple myeloma : Pathologic evaluation of a rare entity. In: American journal of clinical pathology. 2013 ; Vol. 140, No. 4. pp. 519-524.
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