Prognostic value of nuclear morphometry in myxoid liposarcoma

Area of Science:

• Oncology
• Pathology
• Genetics

Background:

• Myxoid liposarcoma (MLS) is a common soft tissue sarcoma.
• The round cell component (RCC) is a suspected poor prognostic factor in MLS.
• Current RCC assessment criteria lack standardization, leading to inconsistent pathological evaluation.

Purpose of the Study:

• To refine and apply established grading systems for nuclear atypia in MLS.
• To investigate the prognostic value of nuclear morphology and cellularity in MLS.
• To correlate grading with molecular markers and patient survival.

Main Methods:

• Modified World Health Organization/International Society of Urological Pathology and Fuhrman grading systems applied to 64 MLS cases.
• Software-based analysis of morphology and cellularity.
• DNA mutation analysis, mRNA expression profiling, and immunohistochemistry.

Main Results:

• High-nuclear-grade MLS, assessed by the modified Fuhrman system, showed significantly poorer disease-free survival (HR: 4.43, p=0.047).
• Increased cellularity was observed in high-grade tumors but was not an independent prognostic factor.
• High-grade tumors exhibited significant upregulation of cell cycle genes (FOXM1, PLK1, CDK1).

Conclusions:

• Nuclear morphology, evaluated using a modified Fuhrman grading system, is a more reliable predictor of MLS prognosis than cellular density.
• This grading approach aids in identifying patients with a poorer prognosis, potentially guiding treatment decisions.