Abstract
Recently, mutations in the nucleophosmin (NPM1) gene were detected in 50-60% of adult acute myelogenous leukemia (AML) patients, mainly with a normal karyotype. In this study, we detected typical NPM1 mutations (types A, B, D) in untreated Chinese AML patients using real-time quantitative polymerase chain reaction (RQ-PCR) followed by sequence analysis. The detection rate of NPM1 mutations in 220 AML patients was 16.4%, including 107 (14.2%) with the French-American-British (FAB) subtype M2, 43 (2.3%) with M3, and 52 (30.8%) with M4/M5. Only one case each with an NPM1 mutation was detected in four M0, seven M1, five M6, and two M7 cases. Eight patients were followed up after treatment, and five patients in hematologic remission continued to test negative for NPM1 mutations within 2-14 months of follow-up. Sequence analysis revealed that all the 36 positive cases were heterozygous for the mutation with 4-bp insertions at nt 959; the 36 cases included 29 (80.6%) cases with type A, four (11.1%) cases with type B, and one rare DD-3 mutation. We also detected two new mutations, namely, CTCG and CAAG insertions, named BJ-01 and BJ-02, respectively. Further, 38.9% (14/36) patients with NPM1 mutations simultaneously exhibited internal ...Continue Reading
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