RT Journal Article T1 Prognostic significance of FLT3-ITD length in AML patients treated with intensive regimens. A1 Castaño-Bonilla, Tamara A1 Alonso-Dominguez, Juan M A1 Barragan, Eva A1 Rodriguez-Veiga, Rebeca A1 Sargas, Claudia A1 Gil, Cristina A1 Chillon, Carmen A1 Vidriales, Maria B A1 Garcia, Raimundo A1 Martinez-Lopez, Joaquin A1 Ayala, Rosa A1 Larrayoz, Maria J A1 Anguita, Eduardo A1 Cuello, Rebeca A1 Cantalapiedra, Alberto A1 Carrillo, Estrella A1 Soria-Saldise, Elena A1 Labrador, Jorge A1 Recio, Isabel A1 Algarra, Lorenzo A1 Rodriguez-Medina, Carlos A1 Bilbao-Syeiro, Cristina A1 Lopez-Lopez, Juan A A1 Serrano, Josefina A1 De-Cabo, Erik A1 Sayas, Maria J A1 Olave, Maria T A1 Sanchez-Garcia, Joaquin A1 Mateos, Mamen A1 Blas, Carlos A1 Lopez-Lorenzo, Jose L A1 Lainez-Gonzalez, Daniel A1 Serrano, Juana A1 Martinez-Cuadron, David A1 Sanz, Miguel A A1 Montesinos, Pau K1 Acute myeloid leukaemia K1 Molecular medicine K1 Oncogenesis K1 Prognostic markers AB FLT3-ITD mutations are detected in approximately 25% of newly diagnosed adult acute myeloid leukemia (AML) patients and confer an adverse prognosis. The FLT3-ITD allelic ratio has clear prognostic value. Nevertheless, there are numerous manuscripts with contradictory results regarding the prognostic relevance of the length and insertion site (IS) of the FLT3-ITD fragment. We aimed to assess the prognostic impact of these variables on the complete remission (CR) rates, overall survival (OS) and relapse-free survival (RFS) of AML patients with FLT3-ITDmutations. We studied the FLT3-ITD length of 362 adult AML patients included in the PETHEMA AML registry. We tried to validate the thresholds of ITD length previously published (i.e., 39 bp and 70 bp) in intensively treated AML patients (n = 161). We also analyzed the mutational profile of 118 FLT3-ITD AML patients with an NGS panel of 39 genes and correlated mutational status with the length and IS of ITD. The AUC of the ROC curve of the ITD length for OS prediction was 0.504, and no differences were found when applying any of the thresholds for OS, RFS or CR rate. Only four out of 106 patients had ITD IS in the TKD1 domain. Our results, alongside previous publications, confirm that FLT3-ITD length lacks prognostic value and clinical applicability. PB Nature Publishing Group YR 2021 FD 2021-10-20 LK https://hdl.handle.net/10668/28337 UL https://hdl.handle.net/10668/28337 LA en NO Castaño-Bonilla T, Alonso-Dominguez JM, Barragán E, Rodríguez-Veiga R, Sargas C, Gil C, et al. Prognostic significance of FLT3-ITD length in AML patients treated with intensive regimens. Sci Rep. 2021 Oct 20;11(1):20745. DS RISalud RD Aug 6, 2025