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Ref Type Journal Article
PMID (21494260)
Authors Itzykson R, Kosmider O, Cluzeau T, Mansat-De Mas V, Dreyfus F, Beyne-Rauzy O, Quesnel B, Vey N, Gelsi-Boyer V, Raynaud S, Preudhomme C, Ades L, Fenaux P, Fontenay M
Title Impact of TET2 mutations on response rate to azacitidine in myelodysplastic syndromes and low blast count acute myeloid leukemias.
Journal Vol Issue Date Pages Journal Short Title
Leukemia 25 7 2011 Jul 1147-52 Leukemia
URL
Abstract Text The impact of ten-eleven-translocation 2 (TET2) mutations on response to azacitidine (AZA) in MDS has not been reported. We sequenced the TET2 gene in 86 MDS and acute myeloid leukemia (AML) with 20-30% blasts treated by AZA, that is disease categories wherein this drug is approved by Food and Drug Administration (FDA). Thirteen patients (15%) carried TET2 mutations. Patients with mutated and wild-type (WT) TET2 had mostly comparable pretreatment characteristics, except for lower hemoglobin, better cytogenetic risk and longer MDS duration before AZA in TET2 mutated patients (P=0.03, P=0.047 and P=0.048, respectively). The response rate (including hematological improvement) was 82% in MUT versus 45% in WT patients (P=0.007). Mutated TET2 (P=0.04) and favorable cytogenetic risk (intermediate risk: P=0.04, poor risk: P=0.048 compared with good risk) independently predicted a higher response rate. Response duration and overall survival were, however, comparable in the MUT and WT groups. In higher risk MDS and AML with low blast count, TET2 status may be a genetic predictor of response to AZA, independently of karyotype.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
TET2 mutant acute myeloid leukemia predicted - sensitive Azacitidine Phase I Actionable In a retrospective analysis, presence of a TET2 mutation correlated with higher overall response rate (ORR) in patients with myelodysplastic syndrome and acute myeloid leukemia following treatment with Vidaza (azacitidine), with an ORR of 85% (11/3) in TET2-mutated patients, compared to 47% (34/47) in patients with wild-type TET2, but did not correlate with overall survival (PMID: 21494260). 21494260