Conflicts of interest None declared.
MUM1 expression in cutaneous CD30+ lymphoproliferative disorders: a valuable tool for the distinction between lymphomatoid papulosis and primary cutaneous anaplastic large-cell lymphoma
Article first published online: 10 APR 2008
© 2008 The Authors. Journal Compilation © 2008 British Association of Dermatologists
British Journal of Dermatology
Volume 158, Issue 6, pages 1280–1287, June 2008
How to Cite
Kempf, W., Kutzner, H., Cozzio, A., Sander, C. A., Pfaltz, M.C., Müller, B. and Pfaltz, M. (2008), MUM1 expression in cutaneous CD30+ lymphoproliferative disorders: a valuable tool for the distinction between lymphomatoid papulosis and primary cutaneous anaplastic large-cell lymphoma. British Journal of Dermatology, 158: 1280–1287. doi: 10.1111/j.1365-2133.2008.08566.x
- Issue published online: 10 APR 2008
- Article first published online: 10 APR 2008
- Accepted for publication 12 February 2008
- anaplastic large-cell lymphoma;
- cutaneous lymphoma;
- lymphomatoid papulosis;
Background Primary cutaneous CD30+ lymphoproliferative disorders include lymphomatoid papulosis (LyP) and primary cutaneous CD30+ anaplastic large T-cell lymphoma (ALCL). Because of overlapping histological features, it is impossible to distinguish ALCL from LyP on histological grounds. MUM1 (Multiple Myeloma oncogene 1) is expressed in systemic ALCL and classical Hodgkin lymphoma. MUM1 expression has not been studied in detail in CD30+ lymphoproliferative disorders.
Objectives To examine the expression of MUM1 in CD30+ lymphoproliferative disorders and to assess its value as a diagnostic marker.
Methods Thirty-one formalin-fixed paraffin-embedded specimens of LyP (n = 15), primary cutaneous ALCL (n = 10), secondary cutaneous infiltrates of systemic ALCL (n = 4) and secondary cutaneous Hodgkin lymphoma (n = 2) were analysed by immunohistochemistry with a monoclonal antibody against MUM1.
Results Positive staining for MUM1 was observed in 13 cases of LyP (87%), two cases of primary cutaneous ALCL (20%), four cases of secondary cutaneous ALCL (100%) and two cases of secondary cutaneous Hodgkin lymphoma (100%). In 11 of 13 LyP cases (85%), MUM1 was displayed by the majority, i.e. 50–90%, of the tumour cells. In contrast to LyP and secondary cutaneous ALCL, only two cases of primary cutaneous ALCL (20%) harboured MUM1-positive tumour cells. There was a statistically significant difference in the expression of MUM1 between LyP and primary cutaneous ALCL (P = 0·002) and between primary cutaneous ALCL and secondary cutaneous ALCL (P = 0·015).
Conclusions MUM1 expression is a valuable tool for the distinction of LyP and ALCL and thus represents a novel adjunctive diagnostic marker in CD30+ lymphoproliferative disorders.