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mutation du domaine de liaison-ligand ESR1 (D538G, Y537S/N/C, L536H, E380Q) acquise dans ~30-40%...

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IDRF-BREAST-ESR1-MUT-ACTIONABLE
TypeSignal d’alerte
Étatreviewed 2026-04-27 | pending_clinical_signoff
MaladiesDIS-BREAST
SourcesSRC-EMERALD-BIDARD-2022 SRC-ESMO-BREAST-METASTATIC-2024 SRC-NCCN-BREAST-2025

Origine du drapeau rouge

DéfinitionESR1 ligand-binding-domain mutation (D538G, Y537S/N/C, L536H, E380Q) acquired in ~30-40% of HR+/HER2- metastatic breast cancers progressing on aromatase inhibitor. Predictive for elacestrant (oral SERD; EMERALD — mPFS 3.8 vs 1.9 mo in ESR1-mut subgroup) post-AI.
Direction cliniqueintensifier
Catégoriehigh-risk-biology
Algorithme de décalageALGO-BREAST-HR-POS-2L

Logique de déclenchement

{
  "any_of": [
    {
      "finding": "esr1_mutation",
      "value": true
    },
    {
      "finding": "esr1_status",
      "value": "mutated"
    },
    {
      "finding": "esr1_lbd",
      "value": "positive"
    }
  ],
  "type": "biomarker"
}

Notes

Test on ctDNA at progression on AI ± CDK4/6i (preferred — high concordance, polyclonal mutations common in tissue). Y537S confers more aggressive biology than D538G in some series. ESR1-WT post-AI patients did not benefit from elacestrant in EMERALD — fulvestrant + capivasertib / alpelisib alternative. Other oral SERDs (camizestrant, giredestrant, imlunestrant) and PROTACs in phase-3 development.

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Algorithmes

Chapitres du manuel

Signal d’alerte