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Soft Tissues: Lipoblastoma

Written2005-01Cristina Morerio, Claudio Panarello
Dipartimento di Ematologia ed Oncologia Pediatrica, IRCCS Istituto Giannina Gaslini, Largo G. Gaslini 5, 16147 Genoa, Italy

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ICD-Topo C470-C476,C478-C479,C490-C496,C498-C499 CONNECTIVE & SOFT TISSUE
ICD-Morpho 8881/0 Lipoblastoma / Lipoblastomatosis
Atlas_Id 5155
Phylum Soft Tissues::Lipoblastoma
WHO/OMS Classification Soft Tissues


    Two forms of the tumor lesion have been described: encapsulated circumscribed type (lipoblastoma), and a noncapsulated diffuse infiltrative type (lipoblastomatosis).

Clinics and Pathology

Disease Benign uncommon soft-tissue tumor of embryonal fat.
Embryonic origin Develops from embryonic remnants of white fat tissue.
Epidemiology Primarily occurs in young children (<3 years) prevalently male.
Clinics Presents in superficial tissues of arms and legs (deeper in lipoblastomatosis), though mediastinum, retroperitoneum, trunk, head and neck may be affected.
Pathology Lobulated tissue composed of immature fat cells separated by fibro-vascular septa and areas with a myxoid matrix. The lobules contain lipoblasts in different stages of differentiation, ranging from primitive, spindle-shaped cells to lipoblasts simulating mature fat cells. Differential diagnosis, particularly in older children or in diffuse lipoblastoma, include myxoid liposarcoma and atypical lipoma and may be based on distinct cytogenetic abnormalities.
Treatment Surgical excision.
Prognosis These tumors have an excellent prognosis but local recurrence is possible expecially in diffuse lesions.


Pseudodiploid karyotype with clonal chromosomal rearrangements involving the 8q11-13 region. Gain of chromosome 8 is reported.
Cytogenetics Molecular Detectable by metaphase and/or interphase FISH using specific PLAG1 probes.
Dual-color FISH analysis in a case of lipoblastoma with complex structural rearrangement: RP11-140I16 (PLAG1) (red) was cohybrized with RP11-299N14 (HAS2) (green). Arrow indicates PLAG1-HAS2 fusion signal on the der(8), arrowhead indicates the normal chromosome 8. The BAC clones were provided by Prof. M.Rocchi.
Probes RP11-140I16, BAC227k20, YAC164H5, RP11-299N14, YAC947h7.

Genes involved and Proteins

Gene NamePLAG1 (Pleomorphic adenoma gene 1)
Location 8q12.1
Dna / Rna 7313 bp mRNA
Protein PLAG1, (together with PLAGL1 and PLAGL2), belongs to a subfamily of C2H2 zinc finger transcription factors that activate transcription.

Gene NameHAS2 (hyaluronan synthase 2)
Location 8q24.13

Gene NameCOL1A2 (collagen, type I, alpha 2)
Location 7q21.3

Result of the chromosomal anomaly

Hybrid Gene
Note HAS2-PLAG1, COL1A2-PLAG1 Chromosomal rearrangements in tumor tissue determine PLAG1 transcriptional up-regulation.
Description The 8q12 rearrangement results in a promoter-swapping event, whereby the PLAG1 promoter element is replaced by promoting regions from other genes, notably hyaluronic acid synthase 2 (HAS2) or collagen 1 a 2 (COL1A2).
5' HAS2 - 3' PLAG1 fused after an 8q intrachromosomal rearrangement that determined the juxtaposition of band 8q12.1 to 8q24.1. The breakpoint of HAS2 gene is in intron 1, whereas its coding sequence starts at the first codon of exon 2.
5' COL1A2 - 3' PLAG1 has been described in one case of t(7;8)(p22;q13)
Transcript Alternative splicing variants which included or lacked PLAG1 exon 2.
Fusion Protein
Description HAS2-PLAG1 and COL1A2-PLAG1 both encode a full-lenght PLAG1 protein.


Evidence of involvement of the PLAG1 gene in lipoblastomas.
Astrom A, D'Amore ES, Sainati L, Panarello C, Morerio C, Mark J, Stenman G
International journal of oncology. 2000 ; 16 (6) : 1107-1110.
PMID 10811981
Evidence by spectral karyotyping that 8q11.2 is nonrandomly involved in lipoblastoma.
Chen Z, Coffin CM, Scott S, Meloni-Ehrig A, Shepard R, Issa B, Forsyth DR, Sandberg AA, Brothman AR, Lowichik A
The Journal of molecular diagnostics : JMD. 2000 ; 2 (2) : 73-77.
PMID 11272891
Benign lipoblastomatosis. An analysis of 35 cases.
Chung EB, Enzinger FM
Cancer. 1973 ; 32 (2) : 482-492.
PMID 4353020
PLAG1 alterations in lipoblastoma: involvement in varied mesenchymal cell types and evidence for alternative oncogenic mechanisms.
Gisselsson D, Hibbard MK, Dal Cin P, Sciot R, Hsi BL, Kozakewich HP, Fletcher JA
The American journal of pathology. 2001 ; 159 (3) : 955-962.
PMID 11549588
Lipoblastoma and lipoblastomatosis: a report of two cases and review of the literature.
Harrer J, Hammon G, Wagner T, Bolkenius M
European journal of pediatric surgery : official journal of Austrian Association of Pediatric Surgery ... [et al] = Zeitschrift fur Kinderchirurgie. 2001 ; 11 (5) : 342-349.
PMID 11719876
PLAG1 fusion oncogenes in lipoblastoma.
Hibbard MK, Kozakewich HP, Dal Cin P, Sciot R, Tan X, Xiao S, Fletcher JA
Cancer research. 2000 ; 60 (17) : 4869-4872.
PMID 10987300
Atypical lipomatous tumor in a 14-year-old patient: distinction from lipoblastoma using FISH analysis.
Kuhnen C, Mentzel T, Fisseler-Eckhoff A, Debiec-Rychter M, Sciot R
Virchows Archiv : an international journal of pathology. 2002 ; 441 (3) : 299-302.
PMID 12242528
PLAG1-HAS2 fusion in lipoblastoma with masked 8q intrachromosomal rearrangement.
Morerio C, Rapella A, Rosanda C, Tassano E, Gambini C, Romagnoli G, Panarello C
Cancer genetics and cytogenetics. 2005 ; 156 (2) : 183-184.
PMID 15642402
Lipoblastoma: a case with t(7;8)(q31;q13).
Panarello C, Rosanda C, Morerio C, Russo I, Dallorso S, Gambini C, Ricco AS, Storlazzi T, Archidiacono N, Rocchi M
Cancer genetics and cytogenetics. 1998 ; 102 (1) : 12-14.
PMID 9530333
Updates on the cytogenetics and molecular genetics of bone and soft tissue tumors: lipoma.
Sandberg AA
Cancer genetics and cytogenetics. 2004 ; 150 (2) : 93-115.
PMID 15066317
Chromosome abnormalities in two benign adipose tumors.
Sandberg AA, Gibas Z, Saren E, Li FP, Limon J, Tebbi CK
Cancer genetics and cytogenetics. 1986 ; 22 (1) : 55-61.
PMID 3456828


This paper should be referenced as such :
Morerio, C ; Panarello, C
Soft tissue tumors: Lipoblastoma
Atlas Genet Cytogenet Oncol Haematol. 2005;9(1):56-57.
Free journal version : [ pdf ]   [ DOI ]
On line version :

Other genes implicated (Data extracted from papers in the Atlas) [ 3 ]


Translocations implicated (Data extracted from papers in the Atlas)

 del(8)(q12q24) HAS2/PLAG1
 t(7;8)(q31;q12) COL1A2/PLAG1
 t(8;14)(q12;q24) RAD51B/PLAG1

External links

Mitelman database del(8)(q12q24) [CaseList]     del(8)(q12q24) [Transloc - MCList]   HAS2/PLAG1 Fusion - MCList]
COSMIC[ HAS2 ]   [ PLAG1 ]
Mitelman database t(7;8)(q31;q12) [CaseList]     t(7;8)(q31;q12) [Transloc - MCList]   COL1A2/PLAG1 Fusion - MCList]
COSMIC[ COL1A2 ]   [ PLAG1 ]
Mitelman database t(8;14)(q12;q24) [CaseList]     t(8;14)(q12;q24) [Transloc - MCList]   RAD51B/PLAG1 Fusion - MCList]
COSMIC[ RAD51B ]   [ PLAG1 ]
arrayMap Topo ( C47,C49) arrayMap ((UZH-SIB Zurich)   [auto + random 100 samples .. if exist ]   [tabulated segments]
COSMIC_fusionCOL1A2 (7q21.3) PLAG1 (8q12.1)    [fusion1097] [fusion1098] [fusion1099]
Mitelman databaseCOL1A2/PLAG1[MCList]    COL1A2 (7q21.3) PLAG1 (8q12.1)   t(7;8)(q21;q12)
TICdbCOL1A2/PLAG1    COL1A2 (7q21.3) PLAG1 (8q12.1)
COSMIC_fusionHAS2 (8q24.13) PLAG1 (8q12.1)    [fusion1094] [fusion1095] [fusion1096] [fusion1100]
Mitelman databaseHAS2/PLAG1[MCList]    HAS2 (8q24.13) PLAG1 (8q12.1)   del(8)(q12q24)
Mitelman databaseRAD51B/PLAG1[MCList]    RAD51B (14q24.1) PLAG1 (8q12.1)   t(8;14)(q12;q24)
Disease databaseSoft Tissues: Lipoblastoma
REVIEW articlesautomatic search in PubMed
Last year articlesautomatic search in PubMed

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indexed on : Tue Oct 12 14:40:24 CEST 2021

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