[The incidence of TET2 gene mutation and its clinical significance in acute myeloid leukemia patients].

ABSTRACT

OBJECTIVE: To evaluate the prevalence of TET2 gene mutation in acute myeloid leukemia (AML) patients, and analyze their clinical characteristics and prognosis. METHODS: Polymerase chain reaction (PCR) and direct sequencing were used to sequence exon 3 to 11 of TET2 gene. RESULTS: Among 96 AML patients, TET2 gene mutation was detected in 13 (13.54%) patients (95%CI 6.70% - 20.38%). The median age was 54 years in mutated group and 41 years in unmutated group (P = 0.010). Mutated and unmutated patients did not significantly differ in gender, white blood cells (WBC) count at diagnosis, platelet count, PB and BM blast percentage and chromosome karyotype, excepting for hemoglobin level 84 (70 - 108) g/L in mutated group versus 70 (55 - 87) g/L in unmutated group (P = 0.032). TET2 gene mutation had no significant correlation with C-KIT, FLT3, JAK2V617F mutations, but did with NPM1 mutation. TET2 mutated patients had lower CR1 rate and 2-year overall survival than unmutated in non-M(3) patients (P < 0.05). CONCLUSIONS: TET2 gene mutation is more prevalent in older AML patients and has a certain correlation with clinical characteristics and outcome. It may be a molecular marker for poor prognosis in AML.