Related Experiment Video

Updated: Sep 21, 2025

Mapping the Structure-Function Relationships of Disordered Oncogenic Transcription Factors Using Transcriptomic Analysis
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Lurbinectedin Inhibits the EWS-WT1 Transcription Factor in Desmoplastic Small Round Cell Tumor

Jenna M Gedminas1, Rebecca Kaufman1, Elissa A Boguslawski1

  • 1Division of Oncology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.

Molecular Cancer Therapeutics
|June 3, 2022
PubMed

Insights

Lurbinectedin effectively inhibits EWS-WT1 in Desmoplastic small round cell tumors (DSRCT) by relocating the protein to the nucleolus. This novel mechanism halts tumor growth and shows promise for DSRCT treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Desmoplastic small round cell tumor (DSRCT) is a rare pediatric sarcoma with a poor prognosis.
  • DSRCT relies on the EWS-WT1 transcription factor, a challenging therapeutic target.
  • There is a significant need for novel therapeutic agents targeting EWS-WT1.

Purpose of the Study:

  • To identify compounds that inhibit the EWS-WT1 transcription factor in DSRCT.
  • To investigate the mechanism of action of lurbinectedin on EWS-WT1.
  • To evaluate the therapeutic potential of lurbinectedin in DSRCT models.

Main Methods:

  • Assessing lurbinectedin's effect on EWS-WT1 localization within the nucleus.
  • Analyzing the impact of EWS-WT1 redistribution on gene expression.
  • Evaluating lurbinectedin's efficacy in inhibiting cell proliferation (GI50).
  • Testing lurbinectedin in DSRCT xenograft and patient-derived xenograft (PDX) models.

Main Results:

  • Lurbinectedin inhibits EWS-WT1 by causing its redistribution to the nucleolus.
  • This redistribution reverses the expression of over 70% of the transcriptome.
  • Lurbinectedin significantly inhibits cell proliferation with a low GI50.
  • Tumor regressions were observed in vivo in DSRCT xenograft and PDX models.
  • The nucleolar redistribution mechanism was also observed for wild-type EWSR1 and EWS-FLI1.

Conclusions:

  • Lurbinectedin demonstrates a novel mechanism of action by targeting EWS-WT1 via nucleolar redistribution.
  • Lurbinectedin exhibits potent anti-proliferative effects and induces tumor regression in DSRCT models.
  • The findings support lurbinectedin as a promising clinical candidate for DSRCT treatment.
  • The observed mechanism suggests a potential class effect for EWSR1 fusion-driven tumors.

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