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Int J Clin Exp Pathol 2012;5(6):596-600

Case Report
Small cell carcinoma of the urinary bladder

Tadashi Terada

Department of Pathology, Shizuoka City Shimizu Hospital, Shizuoka, Japan

Received February 22, 2012; Accepted June 29, 2012; Epub July 17, 2012; Published August 15, 2012

Abstract: Primary small cell carcinoma of the urinary bladder is very rare; only several studies have been reported in the English literature. A 62-
year-old woman was admitted to our hospital because of hematuria and dysuria. Bladder endoscopy revealed a large polypoid tumor at the
bladder base. Transurethral bladder tumorectomy (TUR-BT) was performed. Many TUR-BT specimens were obtained. Histologically, the
bladder tumor was pure small cell carcinoma. Immunohistochemically, the tumor cells were positive for cytokeratin (CK) AE1/3, CK CAM5.2,
CK8, CK18, neurone-specific enolase, chromogranin, NCAM (CD56), synaptophysin, Ki-67 (labeling=100%), p53, KIT (CD117), and platelet-
derived growth factor receptor-α (PDGFRA). The tumor cells were negative for CK5/6, CK 34BE12, CK7, CK14, CK19, CK20, p63, CD45, and
TTF-1. A molecular genetic analysis using PCR-direct sequencing showed no mutations of KIT (exons 9, 11, 13 and 17) and PDGFRA (exons
12 and 18) genes. No metastases were found by various imaging techniques. The patient is now treated by cisplatin-based chemotherapy.

Keywords: Small cell carcinoma, urinary bladder, immunohistochemistry, KIT, PDGFRA

Address all correspondence to:
Dr. Tadashi Terada
Department of Pathology
Shizuoka City Shimizu Hospital
Miyakami 1231 Shimizu-Ku
Shizuoka 424-8636, Japan.
Tel: 81-54-336-1111; Fax: 81-54-336-1315
E-mail: piyo0111jp@yahoo.co.jp