Event-free-survival (SE) of children with high-risk non–B ALL.

Children were grouped as PPR-only and T-ALL (n = 34) or PPR-only and leukocyte count of 100 000/μL (n = 30), treated in the AIEOP-ALL95 study. PPR-only is the subgroup of the PPR patients who achieved CR and were negative for t(9;22) and t(4;11) translocations. By definition, this subgroup does not include resistant patients; thus, EFS resembles a disease-free survival type of analysis.