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Primary Retroperitoneal Myxoid Liposarcomas.

Nokitaka Setsu1, Mototaka Miyake, Susumu Wakai

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Primary retroperitoneal myxoid liposarcomas (MLSs) are rare but can occur. This study confirms their existence and provides diagnostic criteria using clinicopathologic and molecular analysis.

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Area of Science:

  • Oncology
  • Pathology
  • Genetics

Background:

  • Myxoid liposarcomas (MLSs) are typically found in extremities and defined by DDIT3 gene fusions.
  • The primary origin of MLSs in the retroperitoneum is debated, with some cases potentially misidentified metastases or other liposarcoma subtypes.
  • Distinguishing primary retroperitoneal MLSs from other liposarcomas with myxoid features, such as those with MDM2 amplifications, is clinically important.

Purpose of the Study:

  • To investigate and confirm the occurrence of primary myxoid liposarcomas originating in the retroperitoneum.
  • To establish diagnostic criteria for retroperitoneal MLSs through clinicopathologic and molecular evaluation.
  • To differentiate primary retroperitoneal MLSs from other liposarcoma subtypes.

Main Methods:

  • Clinicopathologic reevaluation of 5 cases of retroperitoneal liposarcomas with myxoid features.
  • Histologic examination for classic myxoid liposarcoma findings.
  • Fluorescence in situ hybridization (FISH) to detect DDIT3 gene rearrangements and MDM2 amplifications.

Main Results:

  • Five cases of primary retroperitoneal MLSs were identified, representing 2.3% of primary retroperitoneal liposarcomas in the database.
  • Patients (3 male, 2 female) had a median age of 32 years; tumors were localized to the retroperitoneum at presentation.
  • All 5 cases showed focal classic histologic features, harbored DDIT3 gene rearrangements, and lacked MDM2 amplifications.

Conclusions:

  • Primary myxoid liposarcomas can rarely originate in the retroperitoneum.
  • Accurate diagnosis requires a combination of clinicopathologic assessment and molecular analysis (DDIT3 rearrangements).
  • This study clarifies the existence of primary retroperitoneal MLSs, distinguishing them from metastatic disease or other liposarcoma subtypes.