PMID- 27636224 OWN - NLM STAT- MEDLINE DCOM- 20170721 LR - 20180328 IS - 1098-2264 (Electronic) IS - 1045-2257 (Linking) VI - 56 IP - 2 DP - 2017 Feb TI - Pediatric T-cell acute lymphoblastic leukemia. PG - 89-116 LID - 10.1002/gcc.22416 [doi] AB - The most common pediatric malignancy is acute lymphoblastic leukemia (ALL), of which T-cell ALL (T-ALL) comprises 10-15% of cases. T-ALL arises in the thymus from an immature thymocyte as a consequence of a stepwise accumulation of genetic and epigenetic aberrations. Crucial biological processes, such as differentiation, self-renewal capacity, proliferation, and apoptosis, are targeted and deranged by several types of neoplasia-associated genetic alteration, for example, translocations, deletions, and mutations of genes that code for proteins involved in signaling transduction, epigenetic regulation, and transcription. Epigenetically, T-ALL is characterized by gene expression changes caused by hypermethylation of tumor suppressor genes, histone modifications, and miRNA and lncRNA abnormalities. Although some genetic and gene expression patterns have been associated with certain clinical features, such as immunophenotypic subtype and outcome, none has of yet generally been implemented in clinical routine for treatment decisions. The recent advent of massive parallel sequencing technologies has dramatically increased our knowledge of the genetic blueprint of T-ALL, revealing numerous fusion genes as well as novel gene mutations. The challenges now are to integrate all genetic and epigenetic data into a coherent understanding of the pathogenesis of T-ALL and to translate the wealth of information gained in the last few years into clinical use in the form of improved risk stratification and targeted therapies. Here, we provide an overview of pediatric T-ALL with an emphasis on the acquired genetic alterations that result in this disease. (c) 2016 Wiley Periodicals, Inc. CI - (c) 2016 Wiley Periodicals, Inc. FAU - Karrman, Kristina AU - Karrman K AD - Department of Clinical Genetics, Office for Medical Services, Division of Laboratory Medicine, Lund, Sweden. AD - Division of Clinical Genetics, Department of Laboratory Medicine, Lund University, Lund, Sweden. FAU - Johansson, Bertil AU - Johansson B AD - Department of Clinical Genetics, Office for Medical Services, Division of Laboratory Medicine, Lund, Sweden. AD - Division of Clinical Genetics, Department of Laboratory Medicine, Lund University, Lund, Sweden. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20161025 PL - United States TA - Genes Chromosomes Cancer JT - Genes, chromosomes & cancer JID - 9007329 SB - IM MH - Child MH - *DNA Methylation MH - *Epigenesis, Genetic MH - Humans MH - Mutation/*genetics MH - Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/diagnosis/*genetics/therapy MH - Prognosis EDAT- 2016/10/26 06:00 MHDA- 2017/07/22 06:00 CRDT- 2016/09/17 06:00 PHST- 2016/07/01 00:00 [received] PHST- 2016/09/06 00:00 [accepted] PHST- 2016/10/26 06:00 [pubmed] PHST- 2017/07/22 06:00 [medline] PHST- 2016/09/17 06:00 [entrez] AID - 10.1002/gcc.22416 [doi] PST - ppublish SO - Genes Chromosomes Cancer. 2017 Feb;56(2):89-116. doi: 10.1002/gcc.22416. Epub 2016 Oct 25.