Discontinuation of dasatinib or nilotinib in chronic myeloid leukemia: interim analysis of the STOP 2G-TKI study.
Fiche publication
Date publication
février 2017
Journal
Blood
Auteurs
Membres identifiés du Cancéropôle Est :
Dr GUERCI-BRESLER Agnès
Tous les auteurs :
Rea D, Nicolini FE, Tulliez M, Guilhot F, Guilhot J, Guerci-Bresler A, Gardembas M, Coiteux V, Guillerm G, Legros L, Etienne G, Pignon JM, Villemagne B, Escoffre-Barbe M, Ianotto JC, Charbonnier A, Johnson-Ansah H, Noel MP, Rousselot P, Mahon FX,
Lien Pubmed
Résumé
STOP second generation (2G)-tyrosine kinase inhibitor (TKI) is a multicenter observational study designed to evaluate 2G-TKI discontinuation in chronic myeloid leukemia (CML). Patients receiving first-line or subsequent dasatinib or nilotinib who stopped therapy after at least 3 years of TKI treatment and in molecular response 4.5 (MR4.5) with undetectable BCR-ABL1 transcripts for the 2 preceding years at least were eligible for inclusion. This interim analysis reports outcomes of 60 patients with a minimum follow-up of 12 months (median 47, range: 12-65). Twenty-six patients (43.3%) experienced a molecular relapse defined as the loss of a major molecular response (MMR). Relapses occurred after a median time of 4 months (range: 1-38). Cumulative incidences of molecular relapse by 12 and 48 months were 35% (95% confidence interval [CI], 24.79% to 49.41%) and 44.76% (95% CI, 33.35% to 59.91%), respectively. Treatment-free remission (TFR) rates at 12 and 48 months were 63.33% (95% CI, 51.14% to 75.53%) and 53.57% (95% CI, 40.49% to 66.65%), respectively. In univariate analysis, prior suboptimal response or TKI resistance was the only baseline factor associated with significantly worse outcome. A landmark analysis demonstrated that loss of MR4.5 3 months after stopping TKI was predictive of failure to maintain MMR later on. During the treatment-free phase, no progression toward advanced phase CML occurred, and all relapsing patients regained MMR and MR4.5 after restarting therapy. In conclusion, discontinuation of first-line or subsequent 2G-TKI yields promising TFR rates without safety concerns. Further research is encouraged to better define conditions that will offer patients the highest chance to remain free from 2G-TKI therapy.
Mots clés
Adult, Aged, Aged, 80 and over, Dasatinib, therapeutic use, Disease-Free Survival, Female, Fusion Proteins, bcr-abl, antagonists & inhibitors, Humans, Incidence, Leukemia, Myelogenous, Chronic, BCR-ABL Positive, drug therapy, Male, Middle Aged, Neoplasm Recurrence, Local, drug therapy, Protein Kinase Inhibitors, therapeutic use, Pyrimidines, therapeutic use, RNA, Messenger, genetics, Treatment Outcome
Référence
Blood. 2017 Feb;129(7):846-854