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12th Congress of the European Hematology ... - Haematologica

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12 th <strong>Congress</strong> <strong>of</strong> <strong>the</strong> <strong>European</strong> <strong>Hematology</strong> Association<br />

gene were detected with PCR followed by digestion with EcoRV <strong>of</strong> <strong>the</strong><br />

114 bp PCR product (PCR band(s) 68 and 46bp for wild type). Non fully<br />

digested products were considered as mutated. Results. The median age<br />

<strong>of</strong> onset was 47±12 (range from18-75) years, (116 males and 86<br />

females).FLT3-ITD were detected in 36/202 patients (18%) and D835<br />

mutations in 12/202 (6%). In <strong>the</strong> study group <strong>of</strong> 202 patients according<br />

to FAB classification, rate <strong>of</strong> FLT3 mutations were found higher in M3<br />

with 40/176 (22.7%). The distribution <strong>of</strong> FLT3 mutations was as follows:<br />

FLT3-ITD was detected in M2 2/8 (25%) patients, in M3 32/176 (18.2%),<br />

in M4 2/8 (25%). D835 mutation was found in 8 patients with M3 and<br />

4 patients with M2 and M5 type <strong>of</strong> AML. The majority cases were acute<br />

promyelocyte leukaemia and characterized by <strong>the</strong> T-15-17. Evidence to<br />

date suggest that PML/RARA is insufficient for leukomogenesis. Potential<br />

candidate include mutations <strong>of</strong> FLT3, which could confer a proliferative<br />

advantage <strong>the</strong>reby complementing <strong>the</strong> differentiation block induced<br />

by PML-RARA. There was no correlation between patients with ITD<br />

status and gender and age. A positive correlation with high presenting<br />

WBC > 20000/micl (58%) and high percentage <strong>of</strong> circulating blast cells<br />

was demonstrated in ITD positive patients (p

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