Study of NOTCH1 and FBXW7 Mutations and Its Prognostic Significance in South Indian T-Cell Acute Lymphoblastic Leukemia

Study of NOTCH1 and FBXW7 Mutations and Its Prognostic Significance in South Indian T-Cell Acute... NOTCH1/FBXW7 mutations trigger oncogenic NOTCH1 signaling and its downstream target genes play crucial roles in the molecular pathogenesis of T-cell acute lymphoblastic leukemia (T-ALL). In the present study, NOTCH1 and FBXW7 mutations were studied in 25 primary T-ALL samples. All 34 exons of NOTCH1 and hotspot exons (exon 9 and exon 10) of FBXW7 were polymerase chain reaction amplified and sequenced for mutations. Our results showed that 13/25 (52%) were NOTCH1-mutated, of which 11 patients (44%) showed mutation in the hotspot exons. Four patients (16%) had mutations in non–hotspot exons of NOTCH1. Notably, 2 T-ALL patients (8%) harbored mutations in both hotspot and non–hotspot exons of NOTCH1, whereas 2 patients (8%) had mutations in the hotspot exons of FBXW7. In all, 7 mutations were identified which were not previously reported. The real-time polymerase chain reaction study in 15 patients revealed that increased expression of activated NOTCH1 was found in NOTCH1/FBXW7 hotspot exon-mutated cases. In addition, NOTCH1/FBXW7-mutated patients had showed upregulated HES1, c-MYC, NOTCH3 gene expression. When survival analysis was performed including samples (n=50) from our previous study, an early treatment response and better survival was observed in NOTCH1/FBXW7 hotspot-mutated patients. Our study suggests that NOTCH1/FBXW7 hotspot-mutated T-ALL cases had better response to ALL BFM-95 protocol. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Pediatric Hematology / Oncology Wolters Kluwer Health

Study of NOTCH1 and FBXW7 Mutations and Its Prognostic Significance in South Indian T-Cell Acute Lymphoblastic Leukemia

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Publisher
Wolters Kluwer
Copyright
Copyright © 2017 Wolters Kluwer Health, Inc. All rights reserved.
ISSN
1077-4114
eISSN
1536-3678
D.O.I.
10.1097/MPH.0000000000001006
Publisher site
See Article on Publisher Site

Abstract

NOTCH1/FBXW7 mutations trigger oncogenic NOTCH1 signaling and its downstream target genes play crucial roles in the molecular pathogenesis of T-cell acute lymphoblastic leukemia (T-ALL). In the present study, NOTCH1 and FBXW7 mutations were studied in 25 primary T-ALL samples. All 34 exons of NOTCH1 and hotspot exons (exon 9 and exon 10) of FBXW7 were polymerase chain reaction amplified and sequenced for mutations. Our results showed that 13/25 (52%) were NOTCH1-mutated, of which 11 patients (44%) showed mutation in the hotspot exons. Four patients (16%) had mutations in non–hotspot exons of NOTCH1. Notably, 2 T-ALL patients (8%) harbored mutations in both hotspot and non–hotspot exons of NOTCH1, whereas 2 patients (8%) had mutations in the hotspot exons of FBXW7. In all, 7 mutations were identified which were not previously reported. The real-time polymerase chain reaction study in 15 patients revealed that increased expression of activated NOTCH1 was found in NOTCH1/FBXW7 hotspot exon-mutated cases. In addition, NOTCH1/FBXW7-mutated patients had showed upregulated HES1, c-MYC, NOTCH3 gene expression. When survival analysis was performed including samples (n=50) from our previous study, an early treatment response and better survival was observed in NOTCH1/FBXW7 hotspot-mutated patients. Our study suggests that NOTCH1/FBXW7 hotspot-mutated T-ALL cases had better response to ALL BFM-95 protocol.

Journal

Journal of Pediatric Hematology / OncologyWolters Kluwer Health

Published: Jan 1, 2018

References

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