Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Epigenetic reprogramming in relapsed childhood ALL

ABSTRACT: Reversing gene expression signatures in relapsed patient may restore chemosensitivity. We demonstrate that the histone deacetylase inhibitor vorinostat not only reprograms the aberrant gene expression profile of relapsed blasts but is synergistic when applied prior to chemotherapy in primary patient samples and leukemia cell lines Primary patient samples were collected from patients treated at the New York University Medical Center and from the Childrenâs Oncology Group (COG) cell bank,RNA was isolated from three primary patient samples and three B-lineage leukemia cell lines with or without treatment with vorinostat for 24 hours.

ORGANISM(S): Homo sapiens

SUBMITTER: Teena Bhatla

PROVIDER: E-GEOD-34880 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Epigenetic reprogramming reverses the relapse-specific gene expression signature and restores chemosensitivity in childhood B-lymphoblastic leukemia.

Bhatla Teena T Wang Jinhua J Morrison Debra J DJ Raetz Elizabeth A EA Burke Michael J MJ Brown Patrick P Carroll William L WL

Blood 20120411 22

Whereas the improvement in outcome for children with acute lymphoblastic leukemia has been gratifying, the poor outcome of patients who relapse warrants novel treatment approaches. Previously, we identified a characteristic relapse-specific gene expression and methylation signature associated with chemoresistance using a large cohort of matched-diagnosis relapse samples. We hypothesized that "reversing" such a signature might restore chemosensitivity. In the present study, we demonstrate that th ...[more]

PMID: 22496163

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Project description:The clinical and cytogenetic features associated with T-cell acute lymphoblastic leukemia (T-ALL) are not predictive of early treatment failure. Based on the hypothesis that microarrays might identify patients who fail therapy, we used the Affymetrix U133 Plus 2.0 chip and prediction analysis of microarrays (PAM) to profile 50 newly diagnosed patients who were treated in the Children's Oncology Group (COG) T-ALL Study 9404. We identified a 116-member genomic classifier that could accurately distinguish all 6 induction failure (IF) cases from 44 patients who achieved remission; network analyses suggest a prominent role for genes mediating cellular quiescence. Seven genes were similarly upregulated in both the genomic classifier for IF patients and T-ALL cell lines having acquired resistance to neoplastic agents, identifying potential target genes for further study in drug resistance. We tested whether our classifier could predict IF within 42 patient samples obtained from COG 8704 and, using PAM to define a smaller classifier for the U133A chip, correctly identified the single IF case and patients with persistently circulating blasts. Genetic profiling may identify T-ALL patients who are likely to fail induction and for whom alternate treatment strategies might be beneficial. This SuperSeries is composed of the following subset Series:; GSE14613: Microarray analyses of induction failure in T-ALL (COG study 8704); GSE14615: Microarray analyses of induction failure in T-ALL (COG study 9404) Experiment Overall Design: Refer to individual Series Experiment Overall Design: This was a case-controlled, retrospectively designed study. We performed expression profiles on 92 patients with T-ALL treated on Children's Oncology Group studies 8704 (42 patients) and 9404 (50 patients). Experiment Overall Design: Expression profiles were obtained from patients with newly diagnosed T-ALL. NR = no response (induction failure); F= failure (relapse); C= Complete Continous Remission.

Dataset Information

Epigenetic reprogramming in relapsed childhood ALL

Publications

Epigenetic reprogramming reverses the relapse-specific gene expression signature and restores chemosensitivity in childhood B-lymphoblastic leukemia.

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