Reference Detail

Ref Type Journal Article
PMID (29025600)
Authors Sadras T, Heatley SL, Kok CH, McClure BJ, Yeung D, Hughes TP, Sutton R, Ziegler DS, White DL
Title A novel somatic JAK2 kinase-domain mutation in pediatric acute lymphoblastic leukemia with rapid on-treatment development of LOH.
Journal Cancer genetics
Vol 216-217
Issue
Date 2017 Oct
URL
Abstract Text We report a novel somatic mutation in the kinase domain of JAK2 (R938Q) in a high-risk pediatric case of B-cell acute lymphoblastic leukemia (ALL). The patient developed on-therapy relapse at 12 months, and interestingly, the JAK2 locus acquired loss of heterozygosity during treatment resulting in 100% mutation load. Furthermore, we show that primary ALL mononuclear cells harboring the JAK2 R938Q mutation display reduced sensitivity to the JAK1/2 ATP-competitive inhibitor ruxolitinib in vitro, compared to ALL cells that carry a more common JAK2 pseudokinase domain mutation. Our findings are in line with previous reports that demonstrate that mutations within the kinase domain of JAK2 are associated with resistance to type I JAK inhibitors. Importantly, given the recent inclusion of ruxolitinib in trial protocols for children with JAK pathway alterations, we predict that inter-patient genetic variability may result in suboptimal responses to JAK inhibitor therapy in a subset of cases. The need for alternate targeted and/or combination therapies for patients who display inherent or developed resistance to JAK inhibitor therapy will be warranted, and we propose that kinase-mutants less sensitive to type I JAK inhibitors may present a currently unexplored platform for investigation of improved therapies.

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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
Variant Impact Protein Effect Variant Description Associated with drug Resistance
R938Q missense gain of function JAK2 R938Q lies within the JH1 protein kinase domain 2 of the Jak2 protein (UniProt.org). R938Q confers a gain of function to the Jak2 protein, as demonstrated by constitutive Stat5 signaling (PMID: 29025600), transformation of cultured cells (PMID: 24398328), and also displays resistance to Jak1/2 ATP-competitive inhibitors (PMID: 29025600). Y
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
JAK2 R938Q B-cell childhood acute lymphoblastic leukemia resistant Ruxolitinib Preclinical - Patient cell culture Actionable In a preclinical study, bone marrow mononuclear cells from a pediatric B-cell acute lymphoblastic leukemia with an acquired Jak2 R938Q mutation were resistant to Jakafi (ruxolitinib) (PMID: 29025600). 29025600