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Open Access Research

Extraosseous (extramedullary) plasmacytomas: a clinicopathologic and immunophenotypic study of 32 Chinese cases

Zhuo Zuo1, Yuan Tang1, Cheng-Feng Bi1, Wen-Yan Zhang1, Sha Zhao1, Xiao-Qing Wang1, Qun-Pei Yang1, Li-Qun Zou2 and Wei-Ping Liu1*

Author Affiliations

1 Department of Pathology, West China Hospital of Sichuan University, Chengdu, China

2 Department of Oncology, West China Hospital of Sichuan University, Chengdu, China

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Diagnostic Pathology 2011, 6:123  doi:10.1186/1746-1596-6-123

Published: 19 December 2011

Abstract

Background

Extraosseous plasmacytoma, so called extramedullary plasmacytoma (EMP) is relatively rare in China. The aim was investigate the clinicopathologic features of EMP and the role of Immunophenotype and genotype detection in diagnosis of EMP.

Methods

Thirty-two cases of EMP were investigated retrospectively by histopathology, immunophenotype, genotype and survival analysis.

Results

Clinically, the mean age of the patients was 53.4. Most of the patients received no treatment after the diagnosis was established, and the prognosis was relatively poor. Histologically, in 40% of the cases, the neoplastic cells were grade II or III. The neoplastic cells expressed one or more PC associated antigens. The immunophenotype of EMP and inflammation of sinonasal regions with numerous PC infiltrations were compared and showed some difference in expression of CD45, CD27, CD44v6 and Bcl-2 as well. Ig light chain restriction was detected in 87.5% of the cases.

Conclusions

we described 32 Chinese cases of EMP, compare with that reported in the literature, some differences are presented, including higher percentage of grade II and III cases, clinically inconsistent treatment and management as well as poor outcome of the disease.

Keywords:
Extraosseous plasmacytomas; extramedullary; clinicopathology; immunohistochemistry