What question did this study set out to answer?

The research aims to explore how partial inhibition of oncoproteins affects metastasis in Ewing sarcoma.

January 10, 2026EMBO Molecular Medicine0 citationsOpen Access

The Goldilocks paradox: when partial oncoprotein inhibition fuels metastasis in Ewing sarcoma

MCMarie Castets ABAdrien Bertrand-ChapelCentre Léon Bérard JBJean-Yves BlayCentre Léon Bérard

Key Points

The research aims to explore how partial inhibition of oncoproteins affects metastasis in Ewing sarcoma.
Investigated the effects of varying levels of oncoprotein inhibition.

Structured PICO

Does partial or transient inhibition of EWS::FLI1 promote metastatic behavior in Ewing sarcoma models?

Population

Ewing sarcoma preclinical models (cell lines with dTAG degron system, zebrafish, and mouse models)

Intervention

Gradual and transient depletion of EWS::FLI1 (EF) oncoprotein using a dTAG degron system

Comparator

Baseline EF levels or near-complete EF loss

Outcome

Metastatic behavior (migration, invasion, extravasation, and lung metastatic burden)surrogate

Incomplete or transient inhibition of the EWS::FLI1 oncoprotein in Ewing sarcoma paradoxically promotes a persistent pro-metastatic phenotype, highlighting the need for therapies that achieve complete eradication.

Abstract

Targeting oncogenic fusion proteins remains a major challenge in pediatric oncology. In this issue of EMBO Molecular Medicine, Suresh et al (2025) demonstrate that incomplete inhibition of EWS::FLI1 in Ewing sarcoma paradoxically promotes metastatic behavior, revealing critical implications for therapeutic strategies. JY Blay & colleagues discuss the study by Suresh et al, in this issue of EMBO Mol Med, that shows that incomplete inhibition of EWS::FLI1 in Ewing sarcoma paradoxically promotes metastatic behavior.

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