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Ref Type Journal Article
PMID (32348852)
Authors Ross DS, Liu B, Schram AM, Razavi P, Lagana SM, Zhang Y, Scaltriti M, Bromberg JF, Ladanyi M, Hyman DM, Drilon A, Zehir A, Benayed R, Chandarlapaty S, Hechtman JF
Title Enrichment of kinase fusions in ESR1 wild-type, metastatic breast cancer revealed by a systematic analysis of 4854 patients.
Abstract Text Kinase fusions are rare and poorly characterized in breast cancer (BC). We aimed to characterize kinase fusions within a large cohort of advanced BC.A total of 4854 patients with BC were analyzed by Memorial Sloan Kettering-Integrated Mutation Profiling of Actionable Cancer Targets (MSK-IMPACT) targeted DNAseq and MSK-Fusion targeted RNAseq during the study time period.Twenty-seven of 4854 (0.6%) patients harbored fusions: 11 FGFR (five FGFR2, three FGFR3, three FGFR1), five BRAF, four NTRK1, two RET, two ROS1, one ALK, one ERBB2, and one MET. A history of endocrine therapy was present in 15 (56%) of fusion-positive BC; eight of the 15 cases had available pre-treatment samples, of which six were fusion-negative. None of the fusion-positive BC samples harbored ESR1 hotspot mutations. Two patients with acquired LMNA-NTRK1 fusions and metastatic disease received larotrectinib and demonstrated clinical benefit.Kinase fusions in BC are extremely rare, and appear to be enriched in hormone-resistant, metastatic carcinomas and mutually exclusive with ESR1 mutations. The present study expands the spectrum of genetic alterations activating mitogen-activated protein kinase (MAPK) signaling that can substitute for ESR1 mutations in this setting. Molecular testing at progression after endocrine therapy should include fusion testing, particularly in the absence of ESR1 hotspot alterations, in an effort to identify additional therapeutic options which may provide substantial clinical benefit.


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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
EML4 - ALK breast cancer predicted - sensitive Ceritinib + Fulvestrant Preclinical - Cell culture Actionable In a preclinical study, the addition of Zykadia (ceritinib) to Faslodex (fulvestrant) treatment in breast cancer cells expressing EML4-ALK restored growth inhibition in culture (PMID: 32348852). 32348852
EML4 - ALK breast cancer resistant Fulvestrant Preclinical - Cell culture Actionable In a preclinical study, breast cancer cells expressing EML4-ALK demonstrated resistance to treatment with Faslodex (fulvestrant) in culture (PMID: 32348852). 32348852
EML4 - ALK breast cancer sensitive Ceritinib Preclinical - Cell culture Actionable In a preclinical study, breast cancer cells expressing EML4-ALK were sensitive to treatment with Zykadia (ceritinib) in culture, demonstrating inhibition of cell growth (PMID: 32348852). 32348852