Application of MDM2 Fluorescence In Situ Hybridization and Immunohistochemistry in Distinguishing Dedifferentiated Liposarcoma From Other High-grade Sarcomas. Issue 10 (November 2017)

• Record Type: Journal Article
• Authors: Song, Min Jeong; Cho, Kyung-Ja; Lee, Jong-Seok; Song, Joon Seon
• Is Part Of: Applied immunohistochemistry & molecular morphology. Volume 25:Issue 10(2017)
• Publication Date: 2017-11
• Subjects: MDM2 -- amplification -- dedifferentiated liposarcoma -- fluorescence in situ hybridization -- immunohistochemistry; Diagnostic immunohistochemistry -- Periodicals; Immunohistochemistry -- Periodicals; Cells -- Morphology -- Periodicals; Molecular diagnosis -- Periodicals; 616.079
• DOI: 10.1097/PAI.0000000000000365
• Languages: English
• ISSNs: 1541-2016

Abstract

Abstract : Distinguishing dedifferentiated liposarcoma (DDLPS) from other high-grade spindle and pleomorphic sarcomas is important because of better prognosis in case of DDLPS. MDM2 amplification, a genetic abnormality of well-differentiated liposarcoma, is known to be present not only in DDLPS, but also in some other sarcomas. To differentiate DDLPS, we investigated MDM2 amplification and expression in high-grade spindle sarcomas. Eighty-five cases of nonlipogenic high-grade sarcomas, diagnosed between 2008 and 2011, were investigated. Tissue microarray, immunohistochemistry, and fluorescence in situ hybridization for MDM2 were performed. Forty-one of 85 cases (48.2%) showed MDM2 amplification and expression. Cases of MDM2 amplification were reclassified based on histology, immunophenotype, and clinical data. Thirty-nine of 41 cases, including those originally diagnosed as DDLPS (n=30), undifferentiated pleomorphic sarcoma (n=7), myxofibrosarcoma (n=1), and pleomorphic liposarcoma (n=1) could be reclassified as DDLPS. In addition, MDM2 immunohistochemistry and MDM2 fluorescence in situ hybridization showed an excellent correlation ( P <0.001, sensitivity 92.7%, specificity 100%). MDM2 amplification and expression are potentially very useful in distinguishing between DDLPS and other undifferentiated high-grade spindle and pleomorphic sarcomas, even though a few other sarcomas also showed MDM2 amplification and expression.