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  • Title: Transplant outcomes of the triple-negative NPM1/FLT3-ITD/CEBPA mutation subgroup are equivalent to those of the favourable ELN risk group, but significantly better than the intermediate-I risk group after allogeneic transplant in normal-karyotype AML.
    Author: Ahn JS, Kim HJ, Kim YK, Jung SH, Yang DH, Lee JJ, Kim NY, Choi SH, Jung CW, Jang JH, Kim HJ, Moon JH, Sohn SK, Won JH, Kim SH, Kim DD.
    Journal: Ann Hematol; 2016 Mar; 95(4):625-35. PubMed ID: 26692090.
    Abstract:
    The prognostic significance of molecular mutations (FLT3-ITD, NPM1, and CEBPA mutations) was examined in patients with normal-karyotype acute myeloid leukaemia (NK-AML) after allogeneic haematopoietic cell transplantation (HCT). In total, 115 patients received allogeneic HCT for NK-AML and were evaluated for FLT3-ITD, NPM1, and CEBPA mutations in diagnostic samples and for long-term outcomes following HCT, retrospectively. The prevalences of FLT3-ITD(pos), NPM1 (mut), and CEBPA (dm) (double mutations) were 32.2, 43.5, and 24.6 %, respectively. The triple-negative group (NPM1 (wild)/FLT3-ITD(neg)/non-CEBPA (dm)) showed a similar transplant outcome to those in the favourable European LeukemiaNet (ELN) risk group for overall survival (OS) (60.9 vs. 63.7 %; p = 0.810), but a more favourable OS than others in the intermediate-I risk group (40.0 %; p = 0.034). Also, the triple-negative group showed a similar relapse rate at 5 years compared with those in the favourable risk group (9.7 vs. 15.5 %; p = 0.499), but a lower rate of relapse than the others in the intermediate-I risk group (15.5 vs. 48.6 %; p = 0.004). The 5-year relapse incidences were 4.0 % (NPM1 (mut)/FLT3-ITD(neg)), 14.7 % (CEBPA (dm)), 15.5 % (NPM1 (wild)/FLT3-ITD(neg)/non-CEBPA (dm)), 39.1 % (NPM1 (mut)/FLT3-ITD(pos)/non-CEBPA (dm)), and 66.7 % (NPM1 (wild)/FLT3-ITD(pos)/non-CEBPA (dm)). Thus, the triple-negative (NPM1 (wild)/FLT3-ITD(neg)/non-CEBPA (dm)) group showed favourable long-term outcomes after allogeneic HCT in NK-AML, similar to those of the favourable risk group by the ELN risk classification.
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