A+B 5-year probability of OS and PFS in Burkitt lymphoma/leukemia patients. (A) Five-year probablitity of OS in Burkitt lymphoma/leukemia patients (N = 363): 0.80 ± 0.02. (B) Five-year probability of PFS in Burkitt lymphoma/leukemia patients (N = 363): 0.75 ± 0.03. (C) Five-year probability of OS in Burkitt lymphoma/leukemia patients ≤55 years old (n = 265): 0.86 ± 0.02; >55 years old (n = 98): 0.62 ± 0.05 (P < .0001). (D) Five-year probability of PFS in Burkitt lymphoma/leukemia patients ≤55 years old: 0.82 ± 0.03; >55 years old: 0.60 ± 0.05 (P < .0001).