Survival curves of the Binet and Rai stages by prognostic index risk categories in the training data set. (A) Patients in Binet stage A (N = 531); (B) Patients in Binet stage B (N = 443); (C) Patients in Binet stage C (N = 241); (D) Patients in Rai stage 0 (N = 232); (E) Patients in Rai stage I/II (N = 702); (F) Patients in Rai stage III/IV (N = 281).