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MDM4 Amplification in Liposarcoma: A Rare Finding or an Underrecognized Pathway?
Andrea Carilla Sanromán1, Luis Ligorred2, Leticia Ollero Domenche3
1Department of Pathology, Hospital Universitario Miguel Servet, Zaragoza, Spain.
International Journal of Surgical Pathology
|July 21, 2026
Summary
A rare retroperitoneal liposarcoma lacked typical gene amplifications but showed MDM4 amplification. This finding suggests MDM4 as an alternative driver for liposarcoma, potentially indicating a slower-growing tumor.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Atypical lipomatous tumor/well-differentiated liposarcoma (ALT/WDLPS) often involves MDM2 and/or CDK4 amplification.
- A subset of ALT/WDLPS lacks these common alterations, indicating alternative oncogenic drivers.
- Understanding these alternative drivers is crucial for accurate diagnosis and treatment.
Purpose of the Study:
- To investigate the molecular basis of a recurrent retroperitoneal WDLPS lacking typical gene alterations.
- To identify potential alternative oncogenic drivers in liposarcomagenesis.
- To explore the clinical implications of novel genetic findings in WDLPS.
Main Methods:
- Next-generation sequencing (NGS) was employed for comprehensive molecular profiling.
- Histopathological analysis was performed to assess tumor morphology and grade.
- Clinical data, including patient history and disease course, were reviewed.
Main Results:
- The patient's retroperitoneal WDLPS, despite a 25-year history of recurrence, showed a well-differentiated myxoid morphology without dedifferentiation.
- NGS identified MDM4 amplification, alongside PIK3CA and TERT mutations.
- Absence of MDM2/CDK4 amplification was confirmed.
Conclusions:
- MDM4 amplification represents a potential alternative oncogenic driver in liposarcomagenesis.
- This rare genetic alteration may correlate with a more indolent clinical course in WDLPS.
- Identifying MDM4 amplification is important for precise diagnosis and may inform future therapeutic strategies.
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