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Survival estimates according to the presence of prognostic factors for progression to blast phase. Unbroken line: patients with no prognostic factors (n = 46); dashed line: patients with one prognostic factor (n = 68, Cox regression: p-value = 0.04); dotted line: patients with two or more prognostic factors (n = 25, Cox regression: p-value < 0.001).
