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Blood, 2 July 2009, Vol. 114, No. 1, pp. 144-147.
Prepublished online as a Blood First Edition Paper on May 6, 2009; DOI 10.1182/blood-2009-03-210039.
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Submitted March 11, 2009
Accepted April 27, 2009
Genetic characterization of TET1, TET2, and TET3 alterations in myeloid malignancies
Omar Abdel-Wahab, Ann Mullally, Cyrus Hedvat, Guillermo Garcia-Manero, Jay Patel, Martha Wadleigh, Sebastien Malinge, JinJuan Yao, Outi Kilpivaara, Rukhmi Bhat, Kety Huberman, Sabrena Thomas, Igor Dolgalev, Adriana Heguy, Elisabeth Paietta, Michelle M. Le Beau, Miloslav Beran, Martin S. Tallman, Benjamin L. Ebert, Hagop M. Kantarjian, Richard M. Stone, D. Gary Gilliland, John D. Crispino, and Ross L. Levine*
Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, NY, United States
Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, United States
Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, United States
Department of Leukemia, M.D. Anderson Cancer Center, Houston, TX, United States
Division of Hematology/Oncology, Northwestern University Feinberg School of Medicine, Chicago, IL, United States
Montefiore Medical Center - North Division; New York Medical College, Bronx, NY, United States
Section of Hematology/Oncology, University of Chicago, Chicago, IL, United States
Division of Hematology, Department of Medicine, Brigham and Women's Hospital, Boston, MA, United States
Harvard Stem Cell Institute, Boston, MA, United States
Leukemia Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, United States
* Corresponding author; email: leviner{at}mskcc.org.
Disease alleles that activate signal transduction are common in myeloid malignancies, however there are additional unidentified mutations that contribute to myeloid transformation. Based on the recent identification of TET2 mutations we evaluated the mutational status of TET1, TET2, and TET3 in myeloproliferative neoplasms (MPN), chronic myelomonocytic leukemia (CMML), and acute myeloid leukemia (AML). Sequencing of TET2 in 408 paired tumor/normal samples distinguished between 68 somatic mutations and 6 novel single nucleotide polymorphisms and to identify TET2 mutations in MPN (27/354: 7.6%), CMML (29/69 - 42%), AML (11/91 - 12%), and M7 AML (1/28 - 3.6%) samples. We did not identify somatic TET1 or TET3 mutations or TET2 promoter hypermethylation in MPN. TET2 mutations did not cluster in genetically defined MPN, CMML or AML subsets but were associated with decreased overall survival in AML (p=0.029). These data indicate TET2 mutations are observed in different myeloid malignancies and may be important in AML prognosis.

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