Clinical characteristics and prognostic implications of NPM1 mutations in acute myeloid leukemia

Tatsuya Suzuki, Hitoshi Kiyoi, Kazutaka Ozeki, Akihiro Tomita, Satomi Yamaji, Ritsuro Suzuki, Yoshihisa Kodera, Shuichi Miyawaki, Norio Asou, Kazutaka Kuriyama, Fumiharu Yagasaki, Chihiro Shimazaki, Hideki Akiyama, Miki Nishimura, Toshiko Motoji, Katsuji Shinagawa, Akihiro Takeshita, Ryuzo Ueda, Tomohiro Kinoshita, Nobuhiko EmiTomoki Naoe

Research output: Contribution to journalArticlepeer-review

233 Citations (Scopus)


Recently, somatic mutations of the nucleophosmin gene (NPM1), which alter the subcellular localization of the product, have been reported in acute myeloid leukemia (AML). We analyzed the clinical significance of NPM1 mutations in comparison with cytogenetics, FLT3, NRAS, and TP53 mutations, and a partial tandem duplication of the MLL gene (MLL-TD) in 257 patients with AML. We found NPM1 mutations, including 4 novel sequence variants, in 64 of 257 (24.9%) patients. NPM1 mutations were associated with normal karyotype and with internal tandem duplication (ITD) and D835 mutations in FLT3, but not with other mutations. In 190 patients without the M3 French-American-British (FAB) subtype who were treated with the protocol of the Japan Adult Leukemia Study Group, multivariate analyses showed that the NPM1 mutation was a favorable factor for achieving complete remission but was associated with a high relapse rate. Sequential analysis using 39 paired samples obtained at diagnosis and relapse showed that NPM1 mutations were lost at relapse in 2 of the 17 patients who had NPM1 mutations at diagnosis. These results suggest that the NPM1 mutation is not necessarily an early event during leukemogenesis or that leukemia clones with NPM1 mutations are sensitive to chemotherapy.

Original languageEnglish
Pages (from-to)2854-2861
Number of pages8
Issue number8
Publication statusPublished - 10-2005

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology


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