MDM2 copy numbers in well-differentiated and dedifferentiated liposarcoma: characterizing progression to high-grade tumors.

Abstract:

OBJECTIVES:MDM2 gene amplification is associated with well-differentiated (WDL) and dedifferentiated liposarcomas (DDL). Using fluorescent in situ hybridization (FISH), we sought to characterize various patterns of MDM2 amplification among the morphologic spectrum of liposarcoma. METHODS:Forty-six cases of liposarcoma in various sites were examined and included 22 WDLs, 14 DLLs, and 10 negative control subjects. RESULTS:The MDM2 amplification ratio (MDM2/CEP12) was lower in WDL (10.2) compared with DDL (18.3) cases (P = .0000002). An amplification ratio of 16 showed optimal sensitivity (0.86) and specificity (0.96) as a cutoff point for progression to DDL. Borderline areas, defined as tumors with increased cellularity and atypia but with preserved lipomatous differentiation, showed a significantly higher MDM2 ratio (17.5; P = .0007) compared with WDL. Central (retroperitoneal and intra-abdominal) tumors also showed a significantly higher MDM2 ratio than peripheral ones (P = .02). CONCLUSIONS:Differences in MDM2 amplification profiles among liposarcomas could help further define and predict progression to high-grade neoplasia.

journal_name

Am J Clin Pathol

authors

Ware PL,Snow AN,Gvalani M,Pettenati MJ,Qasem SA

doi

10.1309/AJCPLYU89XHSNHQO

subject

Has Abstract

pub_date

2014-03-01 00:00:00

pages

334-41

issue

3

eissn

0002-9173

issn

1943-7722

pii

141/3/334

journal_volume

141

pub_type

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