EWSR1-POU5F1 fusion in soft tissue myoepithelial tumors. A molecular analysis of sixty-six cases, including soft tissue, bone, and visceral lesions, showing common involvement of the EWSR1 gene.
The diagnosis of myoepithelial (ME) tumors outside salivary glands remains challenging, especially in unusual clinical presentations, such as bone or visceral locations. A few reports have indicated EWSR1 gene rearrangement in soft tissue ME tumors, and, in one case each, the fusion partner was identified as either PBX1 or ZNF444. However, larger studies to investigate whether these genetic abnormalities are recurrent or restricted to tumors in soft tissue locations are lacking. Sixty-six ME tumors mainly from soft tissue (71%), but also from skin, bone, and visceral locations, characterized by classic morphological features and supporting immunoprofile were studied. Gene rearrangements in EWSR1, FUS, PBX1, and ZNF444 were investigated by fluorescence in situ hybridization. EWSR1 gene rearrangement was detected in 45% of the cases. A EWSR1-POU5F1 fusion was identified in a pediatric soft tissue tumor by 3'Rapid Amplification of cDNA Euds (RACE) and subsequently confirmed in four additional soft tissue tumors in children and young adults. An EWSR1-PBX1 fusion was seen in five cases, whereas EWSR1-ZNF444 and FUS gene rearrangement was noted in one pulmonary tumor each. In conclusion, EWSR1 gene rearrangement is a common event in ME tumors arising outside salivary glands, irrespective of anatomical location. EWSR1-negative tumors were more often benign, superficially located, and showed ductal differentiation, suggesting the possibility of genetically distinct groups. A subset of soft tissue ME tumors with clear cell morphology harbor an EWSR1-POU5F1 fusion, which can be used as a molecular diagnostic test in difficult cases. These findings do not support a pathogenetic relationship between soft tissue ME tumors and their salivary gland counterparts.
Antonescu
Cristina R
CR
Department of Pathology, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York City, NY 10021, USA. antonesc@mskcc.org
Zhang
Lei
L
Chang
Ning-En
NE
Pawel
Bruce R
BR
Travis
William
W
Katabi
Nora
N
Edelman
Morris
M
Rosenberg
Andrew E
AE
Nielsen
G Petur
GP
Dal Cin
Paola
P
Fletcher
Christopher D M
CD
D000293:Adolescent; D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor; D001859:Bone Neoplasms / Q000175:diagnosis / Q000235:genetics; D002148:Calmodulin-Binding Proteins / Q000235:genetics*; D002648:Child; D020732:Cytogenetic Analysis; D004268:DNA-Binding Proteins / Q000235:genetics; D015870:Gene Expression; D015321:Gene Rearrangement; D006801:Humans; D016130:Immunophenotyping; D017404:In Situ Hybridization, Fluorescence; D008875:Middle Aged; D025202:Molecular Diagnostic Techniques; D009208:Myoepithelioma / Q000175:diagnosis* / Q000235:genetics*; D050814:Octamer Transcription Factor-3 / Q000235:genetics*; D050596:Oncogene Fusion; D015514:Oncogene Proteins, Fusion / Q000235:genetics*; D000075062:Pre-B-Cell Leukemia Transcription Factor 1; D011518:Proto-Oncogene Proteins / Q000235:genetics; D034802:RNA-Binding Protein EWS; D034702:RNA-Binding Protein FUS / Q000235:genetics; D016601:RNA-Binding Proteins / Q000235:genetics*; D012468:Salivary Gland Neoplasms / Q000175:diagnosis / Q000235:genetics; D012878:Skin Neoplasms / Q000175:diagnosis / Q000235:genetics; D012983:Soft Tissue Neoplasms / Q000175:diagnosis / Q000235:genetics; D055815:Young Adult; D016335:Zinc Fingers
D014408:Biomarkers, Tumor; D002148:Calmodulin-Binding Proteins; D004268:DNA-Binding Proteins; C500986:EWSR1 protein, human; D050814:Octamer Transcription Factor-3; D015514:Oncogene Proteins, Fusion; C494173:POU5F1 protein, human; D000075062:Pre-B-Cell Leukemia Transcription Factor 1; D011518:Proto-Oncogene Proteins; D034802:RNA-Binding Protein EWS; D034702:RNA-Binding Protein FUS; D016601:RNA-Binding Proteins; C083400:PBX1 protein, human
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