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Concurrent loss of INI1, PBRM1, and BRM expression in epithelioid sarcoma: implications for the cocontributions of

Li Li1, Xiang-Shan Fan2, Qiu-Yuan Xia2

  • 1Department of Pathology, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China; Department of Pathology, Anhui Medical University, Hefei, China.

Human Pathology
|September 10, 2014
PubMed

Insights

Loss of INI1 and PBRM1 expression is common in epithelioid sarcoma (ES), suggesting these proteins may work together in ES development. This finding could lead to new therapeutic targets for ES.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • INI1 (SMARCB1) loss is a known diagnostic marker for epithelioid sarcoma (ES).
  • The expression of other SWI/SNF complex members in ES has not been previously investigated.

Purpose of the Study:

  • To analyze the expression of key SWI/SNF complex subunits in epithelioid sarcoma.
  • To investigate the potential role of these subunits in ES pathogenesis and as therapeutic targets.

Main Methods:

  • Retrospective analysis of 23 epithelioid sarcoma cases (15 conventional, 8 proximal).
  • Reclassification using H&E staining and immunohistochemistry for cytokeratin, EMA, CD34, vimentin, and INI1.
  • Analysis of INI1, BRG1, BRM, PBRM1, and BAF155 expression.

Main Results:

  • Loss of PBRM1 (82.6%) and INI1 (78.3%) expression was frequent in ES.
  • Concurrent loss of INI1 and PBRM1 was observed in 73.9% of cases.
  • Concurrent loss of BRM, PBRM1, and INI1 was noted in 2 cases with rhabdoid features.

Conclusions:

  • Frequent co-occurrence of INI1 and PBRM1 loss suggests synergistic roles in ES pathogenesis.
  • SWI/SNF complex components may represent novel therapeutic targets for ES.
  • PBRM1 warrants further investigation as an ES biomarker, and BRM may be involved in rhabdoid ES.
Keywords:
BRMEpithelioid sarcomaINI1PBRM1SWI/SNF ATPase complex

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