Diagnostic value of investigating GNAS mutations in fibro-osseous lesions: a retrospective study of 91 cases of fibrous dysplasia and 40 other fibro-osseous lesions

GNAS (guanine nucleotide-binding protein/ α -subunit) mutations that induce the activation of G-protein α -subunit participate in the pathogenesis of fibrous dysplasia. The aim of this study was to evaluate the sensitivity and specificity of GNAS mutations in fibrous dysplasia and other fibro-osseou...

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Veröffentlicht in:Modern pathology 2013-07, Vol.26 (7), p.911-921
Hauptverfasser: Tabareau-Delalande, Flore, Collin, Christine, Gomez-Brouchet, Anne, Decouvelaere, Anne-Valérie, Bouvier, Corinne, Larousserie, Frédérique, Marie, Béatrice, Delfour, Christophe, Aubert, Sébastien, Rosset, Philippe, de Muret, Anne, Pagès, Jean-Christophe, de Pinieux, Gonzague
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container_issue 7
container_start_page 911
container_title Modern pathology
container_volume 26
creator Tabareau-Delalande, Flore
Collin, Christine
Gomez-Brouchet, Anne
Decouvelaere, Anne-Valérie
Bouvier, Corinne
Larousserie, Frédérique
Marie, Béatrice
Delfour, Christophe
Aubert, Sébastien
Rosset, Philippe
de Muret, Anne
Pagès, Jean-Christophe
de Pinieux, Gonzague
description GNAS (guanine nucleotide-binding protein/ α -subunit) mutations that induce the activation of G-protein α -subunit participate in the pathogenesis of fibrous dysplasia. The aim of this study was to evaluate the sensitivity and specificity of GNAS mutations in fibrous dysplasia and other fibro-osseous lesions, to assess the value of investigating this mutation in the diagnosis of fibro-osseous lesions. We studied 91 cases of fibrous dysplasia. The quality and/or quantity of genomic DNA were suitable for molecular analysis for 51 cases of fibrous dysplasia. GNAS mutations were investigated by three techniques: high-resolution melting (exon 8), allele-specific PCR (exons 8 and 9) and/or direct DNA sequencing (exons 8 and 9). Fibrous dysplasia samples were classified blind to the GNAS mutation status into six histological subtypes as conventional, fibro-involutive, osteosclerosing, cementifying, osteocartilaginous and with prominent aneurysmal cystic changes. We also studied 14 cases of low-grade osteosarcoma, 21 cases of ossifying fibroma, 3 cases of osteofibrous dysplasia, 1 case of osseous dysplasia of the jawbone and 1 post-traumatic lesion of the ribs. Twenty-three cases of fibrous dysplasia (45%) showed mutations of codon 201 (exon 8, p.R201H or p.R201C). No mutation was found on codon 227 (exon 9). GNAS mutations in conventional fibrous dysplasia were detected in the same proportion (47%) as in the other histological subtypes (47%, P =0.96), regardless of sex ( P =0.44), age ( P =0.90) and location ( P =1). GNAS mutations were not detected in any other fibro-osseous lesions. The GNAS mutation was thus specific to fibrous dysplasia in the context of fibro-osseous lesions. The particular mosaicism of mutant and non-mutant cells within the lesion or the existence of other mutations not already described could explain the lack of GNAS mutation in cases of fibrous dysplasia. Investigating this mutation may constitute a valuable complementary diagnostic tool, despite its low sensitivity, particularly in unconventional morphologically different subtypes of fibrous dysplasia.
doi_str_mv 10.1038/modpathol.2012.223
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The aim of this study was to evaluate the sensitivity and specificity of GNAS mutations in fibrous dysplasia and other fibro-osseous lesions, to assess the value of investigating this mutation in the diagnosis of fibro-osseous lesions. We studied 91 cases of fibrous dysplasia. The quality and/or quantity of genomic DNA were suitable for molecular analysis for 51 cases of fibrous dysplasia. GNAS mutations were investigated by three techniques: high-resolution melting (exon 8), allele-specific PCR (exons 8 and 9) and/or direct DNA sequencing (exons 8 and 9). Fibrous dysplasia samples were classified blind to the GNAS mutation status into six histological subtypes as conventional, fibro-involutive, osteosclerosing, cementifying, osteocartilaginous and with prominent aneurysmal cystic changes. We also studied 14 cases of low-grade osteosarcoma, 21 cases of ossifying fibroma, 3 cases of osteofibrous dysplasia, 1 case of osseous dysplasia of the jawbone and 1 post-traumatic lesion of the ribs. Twenty-three cases of fibrous dysplasia (45%) showed mutations of codon 201 (exon 8, p.R201H or p.R201C). No mutation was found on codon 227 (exon 9). GNAS mutations in conventional fibrous dysplasia were detected in the same proportion (47%) as in the other histological subtypes (47%, P =0.96), regardless of sex ( P =0.44), age ( P =0.90) and location ( P =1). GNAS mutations were not detected in any other fibro-osseous lesions. The GNAS mutation was thus specific to fibrous dysplasia in the context of fibro-osseous lesions. The particular mosaicism of mutant and non-mutant cells within the lesion or the existence of other mutations not already described could explain the lack of GNAS mutation in cases of fibrous dysplasia. 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The aim of this study was to evaluate the sensitivity and specificity of GNAS mutations in fibrous dysplasia and other fibro-osseous lesions, to assess the value of investigating this mutation in the diagnosis of fibro-osseous lesions. We studied 91 cases of fibrous dysplasia. The quality and/or quantity of genomic DNA were suitable for molecular analysis for 51 cases of fibrous dysplasia. GNAS mutations were investigated by three techniques: high-resolution melting (exon 8), allele-specific PCR (exons 8 and 9) and/or direct DNA sequencing (exons 8 and 9). Fibrous dysplasia samples were classified blind to the GNAS mutation status into six histological subtypes as conventional, fibro-involutive, osteosclerosing, cementifying, osteocartilaginous and with prominent aneurysmal cystic changes. 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Investigating this mutation may constitute a valuable complementary diagnostic tool, despite its low sensitivity, particularly in unconventional morphologically different subtypes of fibrous dysplasia.</abstract><cop>New York</cop><pub>Nature Publishing Group US</pub><pmid>23370769</pmid><doi>10.1038/modpathol.2012.223</doi><tpages>11</tpages><oa>free_for_read</oa></addata></record>
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subjects 631/208/737
692/699/67/1344
692/700/139/422
Adolescent
Adult
Biomarkers - analysis
Bone cancer
Bone Diseases, Developmental - genetics
Bone Neoplasms - genetics
Child
Chromogranins
DNA Mutational Analysis
Female
Fibroma, Ossifying - genetics
GTP-Binding Protein alpha Subunits, Gs - genetics
Humans
Laboratory Medicine
Male
Medicine
Medicine & Public Health
Middle Aged
Mutation
original-article
Osteosarcoma - genetics
Pathology
Proteins
Retrospective Studies
Reverse Transcriptase Polymerase Chain Reaction
Sensitivity and Specificity
Stem cells
Young Adult
title Diagnostic value of investigating GNAS mutations in fibro-osseous lesions: a retrospective study of 91 cases of fibrous dysplasia and 40 other fibro-osseous lesions
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