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Molecular Profile KIT W557_E561del
Therapy Imatinib
Indication/Tumor Type gastrointestinal stromal tumor
Response Type sensitive

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
KIT W557_E561del gastrointestinal stromal tumor sensitive Imatinib Case Reports/Case Series Actionable In a clinical case study, Gleevec (imatinib) treatment led to partial responses in two patients with gastrointestinal stromal tumors harboring KIT W557_E561del, with a progression-free survival (PFS) of 10.7 mo and overall survival (OS) of 14.9 mo in one patient, and a PFS of 32.2 mo and OS of 34.4 mo in the second patient (PMID: 18294292). 18294292
KIT W557_E561del gastrointestinal stromal tumor sensitive Imatinib Preclinical - Pdx Actionable In a preclinical study, Gleevec (imatinib) inhibited tumor growth in a patient-derived xenograft (PDX) model of gastrointestinal stromal tumor harboring KIT W557_E561del with overexpression of GPR20 (IHC score 3+) (PMID: 33579785). 33579785
PubMed Id Reference Title Details
(18294292) Secondary mutations in the kinase domain of the KIT gene are predominant in imatinib-resistant gastrointestinal stromal tumor. Full reference...
(33579785) Identification and Therapeutic Targeting of GPR20, Selectively Expressed in Gastrointestinal Stromal Tumors, with DS-6157a, a First-in-Class Antibody-Drug Conjugate. Full reference...