The chimeric FUS/CREB3l2 gene is specific for low-grade fibromyxoid sarcoma.
Low-grade fibromyxoid sarcoma (LGFMS) is a variant of fibrosarcoma that was recognized as a distinct tumor entity only quite recently. We previously described a translocation, t(7;16)(q33;p11), that resulted in a fusion of the FUS and CREB3L2 (also known as BBF2H7) genes in two soft tissue tumors that fulfilled morphologic criteria for LGFMS. To delineate the spectrum of tumors that may harbor the FUS/CREB3L2 gene, we selected 45 low-grade spindle cell sarcomas for reverse transcriptase polymerase chain reaction (RT-PCR) and/or fluorescence in situ hybridization (FISH) analyses; none of these tumors had originally been diagnosed as LGFMS. Furthermore, also included were two benign soft tissue tumors and nine high-grade sarcomas with supernumerary ring chromosomes or 7q3 rearrangement and three tumors diagnosed as LGFMS prior to the genetic analysis. Of the 59 tumors analyzed, 12 were FUS/CREB3L2-positive, all of which were diagnosed at histopathologic re-examination as being LGFMS, of both the classical subtype and the subtype with giant collagen rosettes. The breakpoints in the fusion transcripts were always in exons 6 or 7 of FUS and exon 5 of CREB3L2. The results indicated that FUS/CREB3L2 is specifically associated with LGFMS and that RT-PCR or FISH analysis may be useful for the differential diagnosis.
Panagopoulos
Ioannis
I
Department of Clinical Genetics, Lund University Hospital, Lund, Sweden.
Storlazzi
Clelia Tiziana
CT
Fletcher
Christopher D M
CD
Fletcher
Jonathan A
JA
Nascimento
Antonio
A
Domanski
Henryk A
HA
Wejde
Johan
J
Brosjö
Otte
O
Rydholm
Anders
A
Isaksson
Margareth
M
Mandahl
Nils
N
Mertens
Fredrik
F
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000595:Amino Acid Sequence / Q000235:genetics; D001483:Base Sequence / Q000235:genetics; D014408:Biomarkers, Tumor / Q000235:genetics; D002874:Chromosome Mapping / Q000379:methods; D017362:Cyclic AMP Response Element-Binding Protein; D020732:Cytogenetic Analysis / Q000379:methods; D005260:Female; D005354:Fibrosarcoma / Q000145:classification / Q000175:diagnosis* / Q000235:genetics; D006801:Humans; D017404:In Situ Hybridization, Fluorescence / Q000379:methods; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D034702:RNA-Binding Protein FUS / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D012509:Sarcoma / Q000175:diagnosis / Q000235:genetics; D012983:Soft Tissue Neoplasms / Q000175:diagnosis / Q000235:genetics; D014157:Transcription Factors / Q000235:genetics*
D014408:Biomarkers, Tumor; C107941:CREB3 protein, human; D017362:Cyclic AMP Response Element-Binding Protein; D034702:RNA-Binding Protein FUS; D011993:Recombinant Fusion Proteins; D014157:Transcription Factors