Tumeur myofibroblastique inflammatoire avec pilote de fusion actionable : fusion ALK (TPM3-ALK, T...

Vue déterministe de l'entité source de la LJAM. L'autorité clinique demeure avec les ID de la source cités et l'état d'approbation de l ́examinateur.

ID	`RF-IMT-HIGH-RISK-BIOLOGY`
Type	Signal d’alerte
État	reviewed 2026-04-27 \| pending_clinical_signoff
Maladies	`DIS-IMT`
Sources	`SRC-NCCN-SARCOMA`

Origine du drapeau rouge

Définition	Inflammatory myofibroblastic tumor with actionable fusion driver: ALK fusion (TPM3-ALK, TPM4-ALK, CLTC-ALK; ~50%), ROS1 fusion (~10%), NTRK fusion (rare), RET fusion (rare), or PDGFRB fusion (rare) — opens targeted-therapy line (crizotinib / lorlatinib for ALK; entrectinib / crizotinib for ROS1; larotrectinib / entrectinib for NTRK; selpercatinib for RET) sparing the patient cytotoxic chemotherapy and aggressive surgery for unresectable disease.
Direction clinique	intensifier
Catégorie	high-risk-biology

Logique de déclenchement

{
  "any_of": [
    {
      "finding": "BIO-ALK-FUSION",
      "value": "positive"
    },
    {
      "finding": "BIO-ALK-REARRANGEMENT",
      "value": "positive"
    },
    {
      "finding": "BIO-ROS1-FUSION",
      "value": "positive"
    },
    {
      "finding": "BIO-NTRK-FUSION",
      "value": "positive"
    },
    {
      "finding": "BIO-RET",
      "value": "fusion"
    }
  ],
  "type": "biomarker"
}

Notes

IMT is fusion-driven in ~60–70% of cases; comprehensive genomic profiling at diagnosis is now standard. Crizotinib in ALK-positive IMT (Schöffski et al, Lancet Oncol 2018; ORR ~50%; pediatric COG- ADVL0912) — also active in ROS1+ (entrectinib STARTRK-2). Resistance to crizotinib emerges via secondary ALK kinase mutations — switch to lorlatinib (more potent, CNS-penetrant) or alectinib. NTRK-fusion IMT responds to larotrectinib / entrectinib (NCCN tumor-agnostic). RET- fusion IMT case reports of selpercatinib responses. This RF re-routes algorithm from surgery-first / chemotherapy to fusion-targeted 1L.

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