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Ref Type Journal Article
PMID (31519698)
Authors Wrzeszczynski KO, Rahman S, Frank MO, Arora K, Shah M, Geiger H, Felice V, Manaa D, Dikoglu E, Khaira D, Chimpiri AR, Michelini VV, Jobanputra V, Darnell RB, Powers S, Choi M
Title Identification of targetable BRAF ΔN486_P490 variant by whole-genome sequencing leading to dabrafenib-induced remission of a BRAF-mutant pancreatic adenocarcinoma.
Journal Cold Spring Harbor molecular case studies
Vol 5
Issue 6
Date 2019 Dec
Abstract Text The tumor genome of a patient with advanced pancreatic cancer was sequenced to identify potential therapeutic targetable mutations after standard of care failed to produce any significant overall response. Matched tumor-normal whole-genome sequencing revealed somatic mutations in BRAF, TP53, CDKN2A, and a focal deletion of SMAD4 The BRAF variant was an in-frame deletion mutation (ΔN486_P490), which had been previously demonstrated to be a kinase-activating alteration in the BRAF kinase domain. Working with the Novartis patient assistance program allowed us to treat the patient with the BRAF inhibitor, dabrafenib. The patient's overall clinical condition improved dramatically with dabrafenib. Levels of serum tumor marker dropped immediately after treatment, and a subsequent CT scan revealed a significant decrease in the size of both primary and metastatic lesions. The dabrafenib-induced remission lasted for 6 mo. Preclinical studies published concurrently with the patient's treatment showed that the BRAF in-frame mutation (ΔNVTAP) induces oncogenic activation by a mechanism distinct from that induced by V600E, and that this difference dictates the responsiveness to different BRAF inhibitors. This study describes a dramatic instance of how high-level genomic technology and analysis was necessary and sufficient to identify a clinically logical treatment option that was then utilized and shown to be of clinical value for this individual.


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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
BRAF N486_P490del pancreatic cancer predicted - sensitive Dabrafenib Case Reports/Case Series Actionable In a clinical case study, a patient with pancreatic cancer harboring BRAF N486_P490del had a partial response when treated with Tafinlar (dabrafenib), demonstrating a decrease in both the size of the primary and metastatic lesions and response duration of 6 months (PMID: 31519698). 31519698