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Area of Science:

  • Oncology
  • Immunology
  • Cancer Biology

Background:

  • Ewing sarcoma is an aggressive cancer affecting young individuals.
  • Transforming growth factor beta (TGFβ) is an immunosuppressive cytokine implicated in cancer progression.
  • The impact of TGFβ inhibition on the Ewing tumor microenvironment (TME) is not well understood.

Purpose of the Study:

  • To investigate the role of TGFβ in the Ewing sarcoma TME.
  • To evaluate the efficacy of TGFβ inhibition combined with radiotherapy in a humanized mouse model.
  • To assess the impact on immune cell infiltration and metastatic burden.

Main Methods:

  • Single-cell RNA sequencing of human Ewing tumors to identify TGFB1 expression.
  • Development and utilization of a humanized mouse model of Ewing sarcoma.
  • Treatment with a TGFβ trap in combination with radiotherapy.

Main Results:

  • Immune cells are the primary source of TGFB1 in the human Ewing TME.
  • Humanized models exhibit distinct TME signatures compared to immunodeficient models.
  • Combined TGFβ inhibition and radiotherapy increased immune cell infiltration and reduced lung metastasis.

Conclusions:

  • TGFβ inhibition during radiotherapy is a promising strategy for metastatic Ewing sarcoma.
  • Immunocompetent models are valuable for studying Ewing sarcoma's immune biology.
  • Disrupting immunosuppression during radiotherapy can reduce metastatic potential.