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Author Spotlight: Genetically Engineered Mouse Models and Pathological Characterization of Neurofibromatosis Type 1 Associated Tumors
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Does synovial sarcoma grade predict oncologic outcomes, and does a low-grade variant exist?

Michael Fice1, Abdullah Almajnooni2, Charles Gusho1,2

  • 1Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois, USA.

Journal of Surgical Oncology
|March 6, 2022
PubMed
Summary
This summary is machine-generated.

Tumor grade predicts outcomes in synovial sarcoma (SS). A proposed Grade 1 SS group demonstrated improved survival and lower metastasis rates, suggesting a potential indolent subtype.

Keywords:
outcomesprognosissoft tissue sarcomasynovial sarcomatumor grade

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Area of Science:

  • Oncology
  • Pathology
  • Surgical Oncology

Background:

  • Synovial sarcoma (SS) is typically aggressive, but some cases exhibit indolent clinical behavior.
  • The prognostic significance of SS tumor grade requires further investigation.
  • The existence of a low-grade SS subtype has been debated.

Purpose of the Study:

  • To investigate if SS tumor grade correlates with oncologic outcomes.
  • To explore the potential existence of a Grade 1 SS, characterized by indolent behavior.

Main Methods:

  • Retrospective review of 35 SS cases diagnosed between 2010 and 2019.
  • Analysis of clinicopathological data.
  • Kaplan-Meier survival analysis to assess recurrence-free survival (RFS) and overall survival (OS).

Main Results:

  • Recurrence-free survival (RFS) was significantly worse with positive surgical margins (p=0.023).
  • Metastasis-free survival was poorer in Grade 3 SS (50.0%) compared to Grade 2 SS (86.5%) (p=0.026).
  • A theoretical Grade 1 SS group exhibited improved OS and RFS compared to Grades 2 and 3, with a 15.8% metastatic rate and 80% 10-year survival.

Conclusions:

  • Tumor grade is a significant predictor of oncologic outcomes in synovial sarcoma.
  • Evidence supports the existence of an indolent Grade 1 SS subtype with favorable prognosis.
  • Findings align with current diagnostic strategies and treatment guidelines for SS.