Solitary fibrous tumor: is there a molecular relationship with cellular angiofibroma, spindle cell lipoma, and mammary-type myofibroblastoma?

American Journal of Clinical Pathology
Karen J FritchieJohn R Goldblum

Abstract

Solitary fibrous tumor (SFT) is a mesenchymal tumor characterized by ovoid cells, branching blood vessels, stromal hyalinization, and CD34 immunoreactivity. Studies have shown loss of 13q in a group of morphologically similar entities, including cellular angiofibroma, mammary-type myofibroblastoma, and spindle cell lipoma. The histologic and immunophenotypic overlap between SFT and the latter group of tumors suggests that these tumors may be genetically linked. We tested a group of 40 SFTs to assess for loss of RB1 (13q14) by fluorescence in situ hybridization (FISH). All 38 SFTs with evaluable signals failed to show loss of RB1 (13q14) by FISH. All cases of cellular angiofibroma (1/1), spindle cell lipoma (6/6), and mammary-type myofibroblastoma (4/4), which were used as a control group, showed monoallelic or biallelic loss of RB1. The absence of RB1 loss in SFTs suggests that they are not related to cellular angiofibroma, mammary-type myofibroblastoma, or spindle cell lipoma.

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Citations

Jun 9, 2016·Journal of Pathology and Translational Medicine·Soyeon AnKyung-Ja Cho
Jul 3, 2013·International Journal of Surgical Pathology·William W WuLisa Shane
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May 31, 2017·The Breast Journal·Timothy M D'AlfonsoSandra J Shin
Jul 30, 2021·Virchows Archiv : an International Journal of Pathology·Emad A RakhaCecily Quinn

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