Internal tandem duplications of Flt3 gene (Flt3/IDT) predicts a poor post-remission outcome in adult patients with acute non-promyelocytic leukemia

S. Ciolli, A. M. Vannucchi, F. Leoni, C. Nozzoli, G. Longo, A. Salati, A. Pancrazzi, L. Bianchi, F. Gigli, A. Bosi

Research output: Contribution to journalArticlepeer-review

Abstract

Despite progress in AML therapy, most patients eventually relapse, even the ones with normal or favorable karyotype. Since survival is poor once relapse occurs, new genetic tools above karyotype at diagnosis are needed to predict leukemia free survival. Recently, Flt3/ITD has been reported as an independent marker for clinical outcome in most studies concerning adult ANIL patients. To assess the prognostic relevance of activating mutations of Flt3, pretreatment samples of 100 not-M3 AML patients, all of them subjected to an intensive chemotherapy regimen, were analyzed for Flt3/ITD; 25/100 patients had one or more Flt3-ITD. Flt3/ITD patients had higher WBC count (P = 0.005) , a lower incidence of a preceding MDS (P = 0.004) and most of them had a normal karyotype. Flt3/ITD had no impact on CR achievement while karyotype remained the most powerful prognostic factor (HR 2.8 95% CI 1.2-6.3). However, post-remission outcome was significantly worsened by the presence of Flt3/ITD. Median RFS of the Flt3/ITD patients was 5 vs. 27 months compared to the patients with wild-type Flt3 (P = 0.0002); moreover, Flt3/ITD patients had a significantly poorer post-remission survival (11 vs. 38 months, P = 0.01). On multivariate analysis, the presence of Flt3-ITD significantly affected relapse free survival and post-remission survival (HR 3.1 and 2.1, respectively). Thus, post-remission outcome highly depends on Flt3 status. Flt3 mutations identify patients at high risk of relapse, who should prospectively receive, according to age, either more aggressive or alternative therapeutic approaches.

Original languageEnglish
Pages (from-to)73-78
Number of pages6
JournalLeukemia and Lymphoma
Volume45
Issue number1
DOIs
Publication statusPublished - Jan 2004

Keywords

  • Acute myeloid leukemia
  • Cytogenetic
  • Flt3
  • Prognostic factors
  • Transplantation

ASJC Scopus subject areas

  • Hematology
  • Oncology
  • Cancer Research

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