Correlation between drug-induced apoptotic parameters in pediatric ALL. Correlation between the percentage of cells with PS externalization and Δψ_m depolarization (A), activated caspase-3 (B), or inactivated PARP (C) in leukemic cells in vitro incubated with prednisolone, vincristine, l-asparaginase, or daunorubicin in 50 children with ALL. The dashed line represent the line x = y and the solid line represents the linear regression line.