High-resolution genomic profiling of pediatric lymphoblastic lymphomas reveals subtle differences with pediatric acute lymphoblastic leukemias in the B-lineage.
Lymphoblastic lymphoma (LBL) is one of the most frequent occurring pediatric non-Hodgkin lymphomas. In the WHO classification scheme, pediatric LBL is considered to be the same disease entity as pediatric acute lymphoblastic leukemia (ALL). However, it is unclear whether the genetic basis of pediatric LBL development is similar to that of pediatric ALL. We performed genome-wide analyses of copy number aberrations in 12 T-LBL and 7 precursor B-cell LBL pediatric cases using high-resolution SNP-based array CGH. Similar to what previously has been found in T-ALL, T-LBL exhibited recurrent deletions of the CDKN2A locus, occurring in 92% of the cases. Additionally, we detected deletions of RB1 (16%), duplications of MYB (16%), and an amplification of ABL1 in one case. These results show that, similar to T-ALL, the genomic alterations in T-LBL predominantly target genes involved in cell cycle progression. The majority of precursor B-cell LBL was characterized by high-hyperdiploidy (71%), and showed high resemblance with high-hyperdiploid precursor B-cell ALL. Taken together, our data suggest that pediatric LBL and ALL exhibit similar genomic abnormalities within confined immunophenotypic and cytogenetic subgroups, but that the representations of these subgroups differs between the two entities.
Schraders
Margit
M
Department of Pathology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
van Reijmersdal
Simon V
SV
Kamping
Eveline J
EJ
van Krieken
Johan H J M
JH
van Kessel
Ad Geurts
AG
Groenen
Patricia J T A
PJ
Hoogerbrugge
Peter M
PM
Kuiper
Roland P
RP
D001402:B-Lymphocytes / Q000473:pathology*; D002453:Cell Cycle; D019070:Cell Lineage; D002648:Child; D002882:Chromosomes, Human, Pair 13 / Q000235:genetics; D002899:Chromosomes, Human, Pair 9 / Q000235:genetics; D020440:Gene Duplication; D020869:Gene Expression Profiling; D015973:Gene Expression Regulation, Leukemic; D015894:Genome, Human / Q000235:genetics*; D006801:Humans; D011123:Polyploidy; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000235:genetics* / Q000473:pathology*; D054218:Precursor T-Cell Lymphoblastic Leukemia-Lymphoma / Q000235:genetics / Q000473:pathology; D013601:T-Lymphocytes / Q000473:pathology