title: Hidden abnormalities and novel classification of t(15;17) acute promyelocytic leukemia (APL) based on genomic alterations.
abstract: Acute promyelocytic leukemia (APL) is a hematopoietic malignant disease characterized by the chromosomal translocation t(15;17), resulting in the formation of the PML-RARA gene. Here, 47 t(15;17) APL samples were analyzed with high-density single-nucleotide polymorphism microarray (50-K and 250-K SNP-chips) using the new algorithm AsCNAR (allele-specific copy-number analysis using anonymous references). Copy-number-neutral loss of heterozygosity (CNN-LOH) was identified at chromosomes 10q (3 cases), 11p (3 cases), and 19q (1 case). Twenty-eight samples (60%) did not have an obvious alteration (normal-copy-number [NC] group). Nineteen samples (40%) showed either one or more genomic abnormalities: 8 samples (17%) had trisomy 8 either with or without an additional duplication, deletion, or CNN-LOH (+8 group); and 11 samples (23%) had genomic abnormalities without trisomy 8 (other abnormalities group). These chromosomal abnormalities were acquired somatic mutations. Interestingly, FLT3-ITD mutations (11/47 cases) occurred only in the group with no genomic alteration (NC group). Taken together, these results suggest that the pathway of development of APL differs in each group: FLT3-ITD, trisomy 8, and other genomic changes. Here, we showed for the first time hidden abnormalities and novel disease-related genomic changes in t(15;17) APL.
authors.affiliation: Division of Hematology and Oncology, Cedars-Sinai Medical Center, University of California at Los Angeles School of Medicine, Los Angeles, CA, USA. tadayuki@staff.kanazawa-u.ac.jp
authors.forename: Tadayuki
authors.initials: T
authors.lastname: Akagi
authors.forename: Lee-Yung
authors.initials: LY
authors.lastname: Shih
authors.forename: Motohiro
authors.initials: M
authors.lastname: Kato
authors.forename: Norihiko
authors.initials: N
authors.lastname: Kawamata
authors.forename: Go
authors.initials: G
authors.lastname: Yamamoto
authors.forename: Masashi
authors.initials: M
authors.lastname: Sanada
authors.forename: Ryoko
authors.initials: R
authors.lastname: Okamoto
authors.forename: Carl W
authors.initials: CW
authors.lastname: Miller
authors.forename: Der-Cherng
authors.initials: DC
authors.lastname: Liang
authors.forename: Seishi
authors.initials: S
authors.lastname: Ogawa
authors.forename: H Phillip
authors.initials: HP
authors.lastname: Koeffler
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002884:Chromosomes, Human, Pair 15; D002886:Chromosomes, Human, Pair 17; D005260:Female; D018628:Gene Dosage; D015973:Gene Expression Regulation, Leukemic; D023281:Genomics; D006801:Humans; D015473:Leukemia, Promyelocytic, Acute / Q000235:genetics* / Q000473:pathology; D019656:Loss of Heterozygosity / Q000235:genetics; D008297:Male; D008875:Middle Aged; D020411:Oligonucleotide Array Sequence Analysis; D015514:Oncogene Proteins, Fusion / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D014178:Translocation, Genetic; D014407:Tumor Cells, Cultured; D055815:Young Adult; D051941:fms-Like Tyrosine Kinase 3 / Q000235:genetics
chemical_list: D015514:Oncogene Proteins, Fusion; C093476:promyelocytic leukemia-retinoic acid receptor alpha fusion oncoprotein; C497970:FLT3 protein, human; D051941:fms-Like Tyrosine Kinase 3