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Rous Sarcoma Virus (RSV) and Cancer01:03

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Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
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Paravertebral Pseudoendocrine Sarcoma.

Julie C Fanburg-Smith1, Zachary Corey1, Jessica D Smith1

  • 1University of Virginia, Charlottesville, VA, USA.

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|December 27, 2025
PubMed
Summary
This summary is machine-generated.

Pseudoendocrine sarcoma is a rare tumor with unique features. Accurate diagnosis is vital due to its intermediate grade and potential for recurrence.

Keywords:
CTNNB1 mutationMesenchymal neoplasmNeuroendocrine-likePseudoendocrine sarcomaSarcomaβ-catenin

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Area of Science:

  • Oncology
  • Pathology
  • Genetics

Background:

  • Pseudoendocrine sarcoma is a rare, epithelioid neoplasm with neuroendocrine-like features.
  • It predominantly affects older adults in paraspinal locations, including the head and neck.

Purpose of the Study:

  • To review and update the understanding of pseudoendocrine sarcoma.
  • To highlight its distinct clinical, histopathological, immunohistochemical, and molecular characteristics.

Main Methods:

  • Comprehensive literature review of case reports and series (2022-2025).
  • Analysis of clinical, histopathological, immunohistochemical, and molecular data.
  • Comparison with differential diagnostic entities.

Main Results:

  • 40 cases reported, with 21 in the head and neck region.
  • Presents as a deep-seated soft tissue tumor with potential bone infiltration.
  • Histology shows epithelioid cells; immunohistochemistry is positive for nuclear β-catenin and negative for neuroendocrine/epithelial markers.
  • Molecular analysis reveals specific recurrent CTNNB1 hotspot mutations.

Conclusions:

  • Distinguishing pseudoendocrine sarcoma is crucial due to its intermediate grade and potential for local recurrence and metastasis.
  • Awareness of its unique features is essential for accurate diagnosis and management.
  • It is classified as an intermediate grade sarcoma in the upcoming WHO classification.