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Genome-wide copy number profiling reveals molecular evolution from diagnosis to relapse in childhood acute lymphoblastic leukemia.

Abstract：

:The underlying pathways that lead to relapse in childhood acute lymphoblastic leukemia (ALL) are unknown. To comprehensively characterize the molecular evolution of relapsed childhood B-precursor ALL, we used human 500K single-nucleotide polymorphism arrays to identify somatic copy number alterations (CNAs) in 20 diagnosis/relapse pairs relative to germ line. We identified 758 CNAs, 66.4% of which were less than 1 Mb, and deletions outnumbered amplifications by approximately 2.5:1. Although CNAs persisting from diagnosis to relapse were observed in all 20 cases, 17 patients exhibited differential CNA patterns from diagnosis to relapse. Of the 396 CNAs observed in 20 relapse samples, only 69 (17.4%) were novel (absent in the matched diagnosis samples). EBF1 and IKZF1 deletions were particularly frequent in this relapsed ALL cohort (25.0% and 35.0%, respectively), suggesting their role in disease recurrence. In addition, we noted concordance in global gene expression and DNA copy number changes (P = 2.2 x 10(-16)). Finally, relapse-specific focal deletion of MSH6 and, consequently, reduced gene expression were found in 2 of 20 cases. In an independent cohort of children with ALL, reduced expression of MSH6 was associated with resistance to mercaptopurine and prednisone, thereby providing a plausible mechanism by which this acquired deletion contributes to drug resistance at relapse.

journal_name

Blood

journal_title

Blood

authors

Yang JJ,Bhojwani D,Yang W,Cai X,Stocco G,Crews K,Wang J,Morrison D,Devidas M,Hunger SP,Willman CL,Raetz EA,Pui CH,Evans WE,Relling MV,Carroll WL

doi

10.1182/blood-2008-06-165027

subject

Has Abstract

pub_date

2008-11-15 00:00:00

pages

4178-83

issue

10

eissn

0006-4971

issn

1528-0020

pii

blood-2008-06-165027

journal_volume

112

pub_type

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