Length of survival.

(A) Kaplan-Meier curve based on CD38 expression comparing the length of survival among patients with B-CLL stratified as Rai 0-II; the difference is significant at P = .001. (B) Kaplan-Meier curve based on CD38 expression comparing the length survival among patients with B-CLL stratified as Rai III-IV; the difference is significant at P = .001. (C) Kaplan-Meier curve based on CD38 expression comparing length of survival among patients with B-CLL stratified as having a high β2M (greater than 2.5 mg/L) levels; the difference is significant at P = .0005.