Progression-free survival curves based on CD38 expression.

Kaplan-Meier plot comparing progression-free survival (from low to intermediate/high-modified Rai stage) based on the detection of more than 30% or less than 30% CD38⁺ B-CLL cells (> 30%, 50 cases; < 30%, 118 cases). As shown, CD38⁻ patients experienced a highly significant longer progression-free survival (P = .00006).