Lipoblastoma-like tumor of the vulva: a clinicopathologic, immunohistochemical, fluorescence in situ hybridization and genomic copy number profiling study of seven cases

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11140%2F18%3A10390304" target="_blank" >RIV/00216208:11140/18:10390304 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1038/s41379-018-0102-y" target="_blank" >https://doi.org/10.1038/s41379-018-0102-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41379-018-0102-y" target="_blank" >10.1038/s41379-018-0102-y</a>

Result language

angličtina

Original language name

Lipoblastoma-like tumor of the vulva: a clinicopathologic, immunohistochemical, fluorescence in situ hybridization and genomic copy number profiling study of seven cases

Original language description

Lipoblastoma-like tumor of the vulva was first described as a benign mesenchymal neoplasm of adipocytic differentiation having features of lipoblastoma, myxoid liposarcoma, and spindle cell lipoma. Prior studies of lipoblastoma-like tumor have evaluated PLAG1, HMGA2, and RB1 immunohistochemistry and DDIT3 rearrangement status, with results supporting its distinction from lipoblastoma and myxoid liposarcoma. However, absent RB1 expression was reported in a majority of tested cases, suggesting that lipoblastoma-like tumor may have underlying 13q alterations and be related to RB1-deleted soft tissue tumors. To further understand the molecular genetics of lipoblastoma-like tumor, we examined 7 cases by RB1 immunohistochemistry, DDIT3 and PLAG1 break apart FISH probes, RB1 enumeration FISH probe, and genomic copy number analysis by microarray. Patient age ranged from 21 to 56 years (median 35 years). Clinical follow up was available for 5 patients (71%) ranging 3-264 months (median 74 months). Microscopically, lipoblastoma-like tumor formed large lobules separated by thin and/or thick bands of fibrous tissue and had a prominent network of thin-walled vessels. Each tumor was predominantly composed of spindle cells and lipoblasts with variable quantities of mature adipocytes. RB1 immunohistochemistry exhibited a heterogeneous or &quot;mosaic&quot; pattern of weak and negative nuclear expression in all seven cases. DDIT3 and PLAG1 FISH were negative in each case. No evidence of RB1 regional gain or loss was identified by FISH. Genomic copy number analysis by chromosomal microarray showed a normal diploid profile in six tumors (86%). One tumor had copy number abnormalities consisting of an 11.9 megabase deletion from 1p13.3 to 1p11.2 and monosomy 14. Although lipoblastoma-like tumor has features of lipoblastoma, myxoid liposarcoma, and spindle cell lipoma, it is genetically different from these tumors. Furthermore, lipoblastoma-like tumor does not appear to have structural abnormalities of 13q resulting in deletion of RB1.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

30109 - Pathology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Modern Pathology

ISSN

0893-3952

e-ISSN

—

Volume of the periodical

31

Issue of the periodical within the volume

12

Country of publishing house

US - UNITED STATES

Number of pages

7

Pages from-to

1862-1868

UT code for WoS article

000451623400009

EID of the result in the Scopus database

2-s2.0-85049568832