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BCOR Mutations Identify a Clinically Aggressive Subset of Pediatric Rhabdomyosarcoma

Lianyuan Yu1, Lejian He1, Nan Zhang1

  • 1Department of Pathology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China.

Fetal and Pediatric Pathology
|December 8, 2025
PubMed

Insights

BCOR mutations define a high-risk pediatric rhabdomyosarcoma (RMS) subtype. These aggressive tumors show poor outcomes, highlighting the need for targeted therapies in pediatric cancer research.

Area of Science:

  • Pediatric Oncology
  • Molecular Pathology
  • Genomic Medicine

Background:

  • BCOR mutations are found in approximately 5% of pediatric rhabdomyosarcoma (RMS).
  • The clinical significance and mechanistic roles of BCOR mutations in RMS are not well understood.
  • This study investigates BCOR-mutant RMS as a distinct, high-risk subgroup.

Purpose of the Study:

  • To characterize BCOR-mutant pediatric rhabdomyosarcoma.
  • To define the clinical significance and molecular features of this RMS subgroup.
  • To evaluate the outcomes of patients with BCOR-mutant RMS.

Main Methods:

  • Multimodal analysis of four pediatric embryonal RMS cases with BCOR mutations.
  • Integration of histopathology, immunohistochemistry, and genomic profiling.
  • Correlation of molecular findings with clinical outcomes.

Main Results:

  • All four patients presented with stage IV fusion-negative embryonal RMS (ERMS).
  • Histology varied from conventional to undifferentiated types.
  • Molecular profiling revealed co-alterations in TP53, MDM2/MYC, and aberrant BCOR protein expression.
  • All patients experienced disease progression, with a median event-free survival of 16.5 months.
  • Poorer outcomes were observed in older children.

Conclusions:

  • BCOR mutations may identify an aggressive subtype of pediatric rhabdomyosarcoma.
  • BCOR-mutant RMS represents a high-risk group with poor prognosis.
  • Further research is needed to understand the mechanisms and develop targeted therapies.
Keywords:
BCORpathologypediatric oncologyrhabdomyosarcoma

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