Recurrent novel THBS1-ADGRF5 gene fusion in a new tumor subtype “Acral FibroChondroMyxoid Tumors”

Acral soft tissue tumors are common neoplasms, a subset of which pose a diagnostic challenge. We report 10 cases of a previously unrecognized acral benign soft tissue tumor. These tumors arose on the fingers and toes and involved bone in half of cases. Histologically, the tumors were lobulated and d...

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Veröffentlicht in:Modern pathology 2020-07, Vol.33 (7), p.1360-1368
Hauptverfasser: Bouvier, Corinne, Le Loarer, François, Macagno, Nicolas, Aubert, Sébastien, Audard, Virginie, Geneste, Damien, Gomez-Brouchet, Anne, Guinebretière, Jean-Marc, Larousserie, Frédérique, Pissaloux, Daniel, Marie, Béatrice, Tirode, Franck, Baud, Jessica, De Pinieux, Gonzague
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container_issue 7
container_start_page 1360
container_title Modern pathology
container_volume 33
creator Bouvier, Corinne
Le Loarer, François
Macagno, Nicolas
Aubert, Sébastien
Audard, Virginie
Geneste, Damien
Gomez-Brouchet, Anne
Guinebretière, Jean-Marc
Larousserie, Frédérique
Pissaloux, Daniel
Marie, Béatrice
Tirode, Franck
Baud, Jessica
De Pinieux, Gonzague
description Acral soft tissue tumors are common neoplasms, a subset of which pose a diagnostic challenge. We report 10 cases of a previously unrecognized acral benign soft tissue tumor. These tumors arose on the fingers and toes and involved bone in half of cases. Histologically, the tumors were lobulated and displayed an abundant stroma made of variable fibrous, chondroid and myxoid material reminiscent of cartilaginous or myoepithelial differentiation. Tumor cells harbored small round to reniform nuclei with clear chromatin and inconspicuous nucleoli along with scant eosinophilic cytoplasm. The cells were mostly arranged haphazardly in the stroma but also in small clusters. No mitotic activity was detected. No specific feature was identified in recurrent cases. By immunohistochemistry, the cells consistently stained for CD34 (10/10), ERG (9/10), and SOX9 (7/10). Whole RNA sequencing identified a previously undescribed recurrent in frame THBS1-ADGRF5 gene fusion in all cases. The transcript was confirmed by RT-PCR and was not found in the control group of mimickers including soft tissue chondromas. We propose the name of Acral FibroChondroMyxoid Tumors for this new entity.
doi_str_mv 10.1038/s41379-020-0493-4
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subjects 13/51
38/77
38/91
692/53/2421
692/698
Adult
Bone tumors
CD34 antigen
Cell differentiation
Chromatin
Cytoplasm
Female
Fingers - pathology
Gene fusion
Human health and pathology
Humans
Immunohistochemistry
Laboratory Medicine
Leukocytes (eosinophilic)
Life Sciences
Male
Medicine
Medicine & Public Health
Middle Aged
Neoplasia
Neoplasms, Connective Tissue - genetics
Nucleoli
Oncogene Fusion - genetics
Pathology
Polymerase chain reaction
Receptors, G-Protein-Coupled - genetics
Ribonucleic acid
RNA
Soft Tissue Neoplasms - genetics
Sox9 protein
Stroma
Thrombospondin 1 - genetics
Toes - pathology
Transcription
Tumor cells
Tumors
title Recurrent novel THBS1-ADGRF5 gene fusion in a new tumor subtype “Acral FibroChondroMyxoid Tumors”
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