[Correlation of Early Minimal Residual Disease Level with Prognosis in AML Patients with NPM1 Mutation Positive after Chemotherapy].

Objective: To analyze the correlation of the minimal residual disease level with the prognosis of the AML patients with NPM1 gene mutation positive after chemotherapy.

Methods: The clinical data of 112 newly diagnosed adult AML patients with positive NPM1 gene were collected and retrospectively analyzed. The correlation of the transcripts of NPM1 gene mutation with prognosis of patients was analyzed.

Results: In 112 AML patients, the median transcript level of NPM1 gene mutation accounted for 83.68% (5.86%-486.57%), FLT3-ITD mutation positive was found in 44 cases (39.29%), chromosomal abnormalities in 22 cases (19.64%) and complete remission in 96 cases (85.71%). Multivariate logistic regression analysis showed that the initial induction therapy and white blood cell count closely related with complete remission (P＜0.05). The median follow-up time was 22 (3-36) months, and the 3-year overall survival rate was 66.07% in 112 patients. Multivariate logistic regression analysis showed that both the high level of minimal residual disease at the initial complete remission and the high level of minimal residual disease after consolidation therapy were the independent risk factors for overall survival (P＜0.05).

Conclusion: In newly diagnosed adult AML patients with NPM1 mutation positive, the early high level of minimal residual disease after chemotherapy closely relates with poor prognosis.