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Prognostic significance of microRNA-99a in acute myeloid leukemia patients undergoing allogeneic hematopoietic stem cell transplantation.
Bone Marrow Transplantation 2018 September
Overexpression of microRNA-99a (miR-99a) have been associated with adverse prognosis in acute myeloid leukemia (AML). Nevertheless, whether it also predicts poor outcome in post-allogeneic hematopoietic stem cell transplantation (allo-HSCT) AML patients remains unclear. To further elucidate the prognostic value of miR-99a, 74 AML patients with miR-99a expression report who underwent allo-HSCT from The Cancer Genome Atlas database were identified and grouped into either miR-99ahigh or miR-99alow based on their miR-99a expression levels relative to the median. Two groups had similar clinical and molecular characteristics except that miR-99ahigh group had fewer patients of the French-American-British M4 subtype (P = 0.018) and more frequent CEBPA mutations (P = 0.005). Univariate analysis indicated that high miR-99a expression was unfavorable for both event-free survival (EFS) and overall survival (OS; P = 0.029; P = 0.012, respectively). Multivariate analysis suggested that high miR-99a expression was an independent risk factor for both EFS and OS in AML patients who underwent allo-HSCT [hazard ratio (HR) 1.909, 95% confidence interval (CI) 1.043-3.494, P = 0.036 and HR 2.179, 95% CI 1.192-3.982, P = 0.011, respectively]. Our results further proved that high miR-99a expression could predict worse outcome in AML patients, even in those who underwent intensive post-remission therapy such as allo-HCST.
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