Feature | Result (percent) |
Median age, years (range) | 65 (14 to 92) |
Males | 62 |
Constitutional symptoms | 34 |
Spleen >10 cm below left costal margin | 31 |
Red cell transfusions required | 38 |
Hemoglobin <10 g/dL | 54 |
White blood cell count >25,000/microL | 16 |
White blood cell count <4000/microL | 16 |
Platelet count <100,000/microL | 26 |
Circulating blasts ≥1 percent | 56 |
JAK2 V617F mutation present | 61 |
MPL mutation present | 8 |
IDH mutation present | 4 |
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