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Comparative Lesions Analysis Through a Targeted Sequencing Approach
Published on: November 5, 2019
Evaluation of well-differentiated/de-differentiated liposarcomas by high-resolution oligonucleotide array-based
William D Tap1, Fritz C Eilber, Charles Ginther
1Division of Hematology/Oncology, Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA. wtap@mednet.ucla.edu
Genes, Chromosomes & Cancer
|December 1, 2010
Summary
Genomic analysis reveals distinct chromosomal copy number aberrations in well-differentiated/de-differentiated liposarcomas (WDLS/DDLS). These findings highlight key genetic events driving liposarcoma heterogeneity and malignancy.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Well-differentiated/de-differentiated liposarcomas (WDLS/DDLS) are malignant tumors of fat arising from mesenchymal cells during adipogenesis.
- Understanding the molecular underpinnings of WDLS/DDLS is crucial for addressing their morbid and lethal outcomes.
Purpose of the Study:
- To define and compare genomic events in lipomas, hibernomas, and WD/DDLS using high-resolution array-comparative genomic hybridization (aCGH).
- To identify chromosomal copy number aberrations and gene amplifications characteristic of liposarcoma subtypes.
Main Methods:
- Genome-wide oligonucleotide array-based comparative genomic hybridization (aCGH) was performed on 7 lipomas, 1 hibernoma, and 38 WD/DDLS.
- Gene expression analyses were integrated with aCGH data to correlate genomic alterations with tumor characteristics.
Main Results:
- WDLS/DDLS exhibited complex karyotypes with significant chromosomal copy number aberrations (average 11.1 in WDLS, 22.7 in DDLS).
- All liposarcomas showed 12q13-q15 amplifications involving CDK4, HMGA2, and MDM2.
- Mutually exclusive amplifications of GLI1, JUN, and MAP3K5 were predominantly observed in DDLS, with 6q amplifications linked to retroperitoneal tumors and younger females.
Conclusions:
- Detailed genetic mapping reveals significant heterogeneity within WDLS/DDLS.
- Specific chromosomal and genetic abnormalities distinguish these mesenchymal malignancies, providing insight into their distinct molecular profiles.
