title: Primary synovial sarcoma of the prostate: report of 2 cases and literature review.
abstract: Two cases of primary prostatic synovial sarcoma presenting as a prostatic mass are presented in patients aged 44 and 46 years. Histologically, both tumors were mainly composed of uniform spindle cells forming interlacing fascicles. Clusters of immature epithelioid cells were also observed among the spindle cells in case 1. Immunohistochemically, the tumor cells of both cases were strongly positive for vimentin, bcl-2, CD99, and E-cadherin, as well as focally positive for cytokeratin. However, they were negative for prostate-specific antigen, S-100 protein, CD34, CD117, muscle-specific actin, desmin, and calretinin. The presence of an SYT-SSX gene fusion resulting from t(X;18) was demonstrated from paraffin blocks by reverse transcriptase polymerase chain reaction in both cases. To the authors' knowledge, these represent the fifth and sixth reported cases of prostatic synovial sarcoma. Accurate diagnosis depends on morphologic and immunohistochemical examination and proper molecular analysis.
authors.affiliation: Department of Pathology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China. lijunfee@yahoo.com.cn
authors.forename: Li
authors.initials: L
authors.lastname: Jun
authors.forename: Sun
authors.initials: S
authors.lastname: Ke
authors.forename: Wang
authors.initials: W
authors.lastname: Zhaoming
authors.forename: Xu
authors.initials: X
authors.lastname: Linjie
authors.forename: Yu
authors.initials: Y
authors.lastname: Xinru
mesh_terms: D000328:Adult; D014408:Biomarkers, Tumor / Q000032:analysis; D002887:Chromosomes, Human, Pair 18; D041321:Chromosomes, Human, X; D004273:DNA, Neoplasm / Q000032:analysis; D015622:Epithelioid Cells / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D015514:Oncogene Proteins, Fusion / Q000032:analysis; D011471:Prostatic Neoplasms / Q000737:chemistry / Q000235:genetics / Q000473:pathology* / Q000628:therapy; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013584:Sarcoma, Synovial / Q000737:chemistry / Q000235:genetics / Q000473:pathology* / Q000628:therapy; D014178:Translocation, Genetic
chemical_list: D014408:Biomarkers, Tumor; D004273:DNA, Neoplasm; D015514:Oncogene Proteins, Fusion; C116512:SYT-SSX fusion protein