CLINICAL TRIAL
JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
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Targetable kinase gene fusions in high-risk B-ALL: a study from the Children's Oncology Group.

Blood 2017 June 23
Philadelphia chromosome-like (Ph-like) acute lymphoblastic leukemia (ALL) is a high-risk subtype characterized by genomic alterations that activate cytokine receptor and kinase signaling. We examined the frequency and spectrum of targetable genetic lesions in a retrospective cohort of 1389 consecutively diagnosed patients with childhood B-lineage ALL with high-risk clinical features and/or elevated minimal residual disease at the end of remission induction therapy. The Ph-like gene expression profile was identified in 341 of 1389 patients, 57 of whom were excluded from additional analyses because of the presence of BCR - ABL1 (n = 46) or ETV6 - RUNX1 (n = 11). Among the remaining 284 patients (20.4%), overexpression and rearrangement of CRLF2 ( IGH - CRLF2 or P2RY8 - CRLF2 ) were identified in 124 (43.7%), with concomitant genomic alterations activating the JAK-STAT pathway ( JAK1 , JAK2 , IL7R ) identified in 63 patients (50.8% of those with CRLF2 rearrangement). Among the remaining patients, using reverse transcriptase polymerase chain reaction or transcriptome sequencing, we identified targetable ABL-class fusions ( ABL1 , ABL2 , CSF1R , and PDGFRB ) in 14.1%, EPOR rearrangements or JAK2 fusions in 8.8%, alterations activating other JAK-STAT signaling genes ( IL7R , SH2B3 , JAK1 ) in 6.3% or other kinases ( FLT3 , NTRK3 , LYN ) in 4.6%, and mutations involving the Ras pathway ( KRAS , NRAS , NF1 , PTPN11 ) in 6% of those with Ph-like ALL. We identified 8 new rearrangement partners for 4 kinase genes previously reported to be rearranged in Ph-like ALL. The current findings provide support for the precision-medicine testing and treatment approach for Ph-like ALL implemented in Children's Oncology Group ALL trials.

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