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• W2317742720 abstract "Dedifferentiated liposarcoma (DDLPS) has been defined as a tumor composed of well-differentiated liposarcoma associated with a nonlipogenic undifferentiated sarcoma and is genetically characterized by a 12q13-15 amplicon with MDM2 amplification. Some peripheral (extremities, trunk wall, head/neck) undifferentiated pleomorphic sarcomas (UPS) without areas of well-differentiated liposarcoma present an MDM2 amplification. We addressed whether they are true DDLPS or not. We compared the clinical data, histologic data, MDM2 status (immunohistochemistry [IHC], fluorescence in situ hybridization [FISH]), genomic profile (array comparative genomic hybridization), and follow-up of 19 patients with peripheral UPS with MDM2 amplification and 62 with peripheral conventional DDLPS retrieved from the French sarcoma network (RRePS) and the Conticabase (Connective Tissue Cancer Network database). For a control cohort, we described 153 patients from the Conticabase, with peripheral UPS without expression of MDM2 by IHC. By IHC, tumor cells were positive for MDM2 in 59 conventional DDLPS and in all UPS with MDM2 amplification. FISH analysis and/or quantitative polymerase chain reaction showed amplification of MDM2 in 54 conventional DDLPS and in all UPS with MDM2 amplification. The 2-year overall survival rates of UPS with MDM2 amplification, conventional DDLPS, and UPS without expression of MDM2 were 93.3%, 90.7%, and 73.9%, respectively. Such similarities in the clinical characteristics, morphology, genomic profile, and follow-up of peripheral UPS with MDM2 amplification and peripheral conventional DDLPS strongly suggest that peripheral UPS with MDM2 amplification are in fact DDLPS. Faced with histologic diagnosis of UPS, a systematic IHC evaluation of MDM2 allows a selection of cases for FISH analysis permitting the diagnosis of DDLPS." @default.
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• W2317742720 date "2014-03-01" @default.
• W2317742720 modified "2023-10-16" @default.
• W2317742720 title "Are Peripheral Purely Undifferentiated Pleomorphic Sarcomas With MDM2 Amplification Dedifferentiated Liposarcomas?" @default.
• W2317742720 cites W1977767602 @default.
• W2317742720 cites W2035561282 @default.
• W2317742720 doi "https://doi.org/10.1097/pas.0000000000000131" @default.
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