title: Perivascular epithelioid cell tumor with SFPQ/PSF-TFE3 gene fusion in a patient with advanced neuroblastoma.
abstract: We report a case of perivascular epithelioid cell tumor (PEComa) with an SFPQ/PSF-TFE3 gene fusion in a 14-year-old girl treated for adrenal neuroblastoma for 4 years. Imaging studies revealed a tumor in the wall of the sigmoid colon, which was radiologically different from the neuroblastoma, together with several inguinal and cervical lymph node metastases of the neuroblastoma. Microscopically, the tumor in the sigmoid colon showed sheet-like growth of epithelioid cells with abundant clear cytoplasm and round nuclei, which were separated by thin fibrovascular septa. These epithelioid cells were immunohistochemically positive for vimentin, gp100 (detected with monoclonal antibody HMB-45), and TFE3, and the tumor was diagnosed as PEComa. In a fluorescence in situ hybridization assay using an in-house probe for TFE3, the tumor cells showed split signals, indicating a rearrangement of TFE3. Molecular cloning using 5' rapid amplification of complementary DNA ends and subsequent reverse transcription-polymerase chain reaction revealed an SFPQ/PSF-TFE3 gene fusion. To the best of our knowledge, this is the second reported case of metachronous PEComa subsequent to a primary tumor, and the first report confirming an SFPQ/PSF-TFE3 gene fusion in PEComa.
authors: Division of Pathology, Kanagawa Children's Medical Center, Mutsukawa 2-138-4, Minami-ku, Yokohama 232-8555, Japan. mio@zc4.so-net.ne.jp
authors: Mio
authors: M
authors: Tanaka
authors: Keisuke
authors: K
authors: Kato
authors: Kiyoshi
authors: K
authors: Gomi
authors: Masae
authors: M
authors: Matsumoto
authors: Hironori
authors: H
authors: Kudo
authors: Masato
authors: M
authors: Shinkai
authors: Youkatsu
authors: Y
authors: Ohama
authors: Hisato
authors: H
authors: Kigasawa
authors: Yukichi
authors: Y
authors: Tanaka
mesh_terms: D000293:Adolescent; D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors / Q000235:genetics*; D003110:Colonic Neoplasms / Q000235:genetics / Q000473:pathology* / Q000601:surgery; D005260:Female; D050939:Gene Fusion; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D016609:Neoplasms, Second Primary; D009447:Neuroblastoma / Q000235:genetics / Q000556:secondary* / Q000601:surgery; D000072670:PTB-Associated Splicing Factor; D054973:Perivascular Epithelioid Cell Neoplasms / Q000235:genetics / Q000473:pathology* / Q000601:surgery; D016601:RNA-Binding Proteins
chemical_list: D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors; D000072670:PTB-Associated Splicing Factor; D016601:RNA-Binding Proteins; C069203:TFE3 protein, human