title: MicroRNA signatures associated with cytogenetics and prognosis in acute myeloid leukemia.
abstract: MicroRNAs (miRNAs) are small RNAs of 19 to 25 nucleotides that are negative regulators of gene expression. To determine whether miRNAs are associated with cytogenetic abnormalities and clinical features in acute myeloid leukemia (AML), we evaluated the miRNA expression of CD34(+) cells and 122 untreated adult AML cases using a microarray platform. After background subtraction and normalization using a set of housekeeping genes, data were analyzed using Significance Analysis of Microarrays. An independent set of 60 untreated AML patients was used to validate the outcome signatures using real-time polymerase chain reaction. We identified several miRNAs differentially expressed between CD34(+) normal cells and the AML samples. miRNA expression was also closely associated with selected cytogenetic and molecular abnormalities, such as t(11q23), isolated trisomy 8, and FLT3-ITD mutations. Furthermore, patients with high expression of miR-191 and miR-199a had significantly worse overall and event-free survival than AML patients with low expression (overall survival: miR-191, P = .03; and miR-199a, P = .001, Cox regression). In conclusion, miRNA expression in AML is closely associated with cytogenetics and FLT3-ITD mutations. A small subset of miRNAs is correlated with survival.
authors.affiliation: Division of Hematology and Oncology, Department of Internal Medicine, Comprehensive Cancer Center, Ohio State University, Columbus, OH 43210, USA.
authors.forename: Ramiro
authors.initials: R
authors.lastname: Garzon
authors.forename: Stefano
authors.initials: S
authors.lastname: Volinia
authors.forename: Chang-Gong
authors.initials: CG
authors.lastname: Liu
authors.forename: Cecilia
authors.initials: C
authors.lastname: Fernandez-Cymering
authors.forename: Tiziana
authors.initials: T
authors.lastname: Palumbo
authors.forename: Flavia
authors.initials: F
authors.lastname: Pichiorri
authors.forename: Muller
authors.initials: M
authors.lastname: Fabbri
authors.forename: Kevin
authors.initials: K
authors.lastname: Coombes
authors.forename: Hansjuerg
authors.initials: H
authors.lastname: Alder
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Nakamura
authors.forename: Neal
authors.initials: N
authors.lastname: Flomenberg
authors.forename: Guido
authors.initials: G
authors.lastname: Marcucci
authors.forename: George A
authors.initials: GA
authors.lastname: Calin
authors.forename: Steven M
authors.initials: SM
authors.lastname: Kornblau
authors.forename: Hagop
authors.initials: H
authors.lastname: Kantarjian
authors.forename: Clara D
authors.initials: CD
authors.lastname: Bloomfield
authors.forename: Michael
authors.initials: M
authors.lastname: Andreeff
authors.forename: Carlo M
authors.initials: CM
authors.lastname: Croce
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018952:Antigens, CD34 / Q000378:metabolism; D001772:Blood Cell Count; D019070:Cell Lineage; D002880:Chromosomes, Human, Pair 11 / Q000235:genetics; D002898:Chromosomes, Human, Pair 8 / Q000235:genetics; D003582:Cytogenetics; D015536:Down-Regulation; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007621:Karyotyping; D004915:Leukemia, Erythroblastic, Acute / Q000175:diagnosis* / Q000235:genetics* / Q000473:pathology / Q000628:therapy; D008297:Male; D035683:MicroRNAs / Q000235:genetics*; D008875:Middle Aged; D009154:Mutation / Q000235:genetics; D011379:Prognosis; D013234:Stem Cells / Q000166:cytology / Q000378:metabolism; D016896:Treatment Outcome; D014314:Trisomy / Q000235:genetics
chemical_list: D018952:Antigens, CD34; D035683:MicroRNAs