Fig. 3.
Survival of 151 CLL patients stratified by IL-6 levels.
Distributions were estimated, using the Kaplan-Meier method. Tick marks indicate the point of last follow-up for one or more patients who did not die. Low refers to IL-6 levels ≤4.3 pg/mL. High refers to IL-6 levels >4.3 pg/mL.