Alveolar soft part sarcoma of lung: report of a unique case with emphasis on diagnostic utility of molecular genetic analysis for TFE3 gene rearrangement and immunohistochemistry for TFE3 antigen expression

Diagnostic Pathology

Guoqing Ru²  Xianglei He²  Zhongsheng Zhao²  Cuiyun Wu¹  Qiu Rao³  Ming Zhao² 

[1] Department of Radiology, Zhejiang Provincial People’s Hospital, Hangzhou 310014, China;Depatment of Pathology, Zhejiang Provincial People’s Hospital, Hangzhou 310014, China;Department of Pathology, Nanjing Jinling Hospital, Nanjing 210000, China

关键词: Differential diagnosis;    FISH;    TFE3;    Lung;    ASPS;    Alveolar soft part sarcoma;   

Others  :  1225851
DOI  :  10.1186/s13000-015-0399-5

 received in 2015-07-08, accepted in 2015-08-28,  发布年份 2015

【 摘 要 】

Alveolar soft part sarcoma (ASPS) is a rare, malignant mesenchymal tumor of distinctive clinical, morphologic, ultrastructural, and cytogenetical characteristics. It typically arises in the extremities of adolescents and young adults, but has also been documented in a number of unusual sites, thus causing diagnostic confusions both clinically and morphologically. The molecular signature of ASPS is a specific der(17)t(X;17)(p11.2;q25) translocation, which results in the fusion of TFE3 transcription factor gene at Xp11.2 with ASPL at 17q25. Recent studies have shown that the ASPL-TFE3 fusion transcript can be identified by reverse-transcriptase polymerase chain reaction analysis and TFE3 gene rearragement can be detected using a dual-color, break apart fluorescence in situ hybridization assay in paraffin-embedded tissue, and the resultant fusion protein can be detected immunohistochemically with antibody directed to the carboxy terminal portion of TFE3. Herein, we report a unique case of ASPS presenting as an asymptomatic mass in the lung of a 48 year-old woman without evidence of a primary soft tissue tumor elsewhere at the time of initial diagnosis. To the best of our knowledge, this is the third report of such cases appearing in the English language literature to date. We emphasize the differential diagnoses engendered by ASPS including a series of tumors involving the lung that have nested and alveolar growth patterns, and both clear and eosinophilic cytoplasm, and demonstrate the utility of molecular genetic analysis for TFE3 rearrangement and immunohistochemistry for TFE3 antigen expression for arriving at accurate diagnosis.

【 授权许可】

   
2015 Zhao et al.

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