4.4 Article

Plasmacytoid urothelial carcinoma of the urinary bladder: clinicopathologic, immunohistochemical, ultrastructural, and molecular analysis of a case series

Journal

HUMAN PATHOLOGY
Volume 42, Issue 8, Pages 1149-1158

Publisher

W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1016/j.humpath.2010.11.011

Keywords

Plasmacytoid bladder carcinoma; GATA-3; ISH analysis; Ultrastructural analysis; p53 mutation; Chemotherapy

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A plasmacytoid variant of urothelial carcinoma has been recently recognized in the World Health Organization classification system. This is characterized by a discohesive growth of plasmacytoid cells with eccentric nuclei, extending in the bladder wall and often in the perivesical adipose tissue. Herein, were report the clinicopathologic, immunohistochemical, ultrastructural, and molecular features of a series of plasmacytoid urothelial carcinoma of the urinary bladder. Four bladder carcinomas characterized by epithelial cells with morphologic appearance resembling plasma cells were evaluated at the immunohistochemical, electron microscopic, and molecular genetic levels. Tumor cells stained with cytokeratins, epithelial membrane antigen, GATA-3 (endothelial transcription factor 3), CD 15, p53, and p16. In addition, malignant cells strongly stained with CD138 in all the cases, whereas leukocyte common Herein, we report the clinicopathologic, immunohistochemical, ultrastructural, and molecular features of antigen and multiple myeloma 1/interferon regulatory factor 4 were completely negative, nor the presence of divergent squamous and glandular differentiation. At variance with conventional urothelial carcinoma, the analysis of exons 4-9 of TP53 gene revealed no alteration in all the 4 tumors tested, and this can be of value in choosing additional chemotherapy after surgery. Plasmacytoid carcinoma of the bladder is a tumor entity, which can be characterized by specific immunohistochemical markers, including positivity for GATA-3, and presents phenotypic and genotypic peculiarities. (C) 2011 Elsevier Inc. All rights reserved.

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