Correlation between PS externalization and the downstream apoptotic parameters upon drug exposure in pediatric ALL
Drug .  | Δψm depolarization .  | Caspase-3 activation .  | PARP inactivation .  | 
|---|---|---|---|
| Prednisolone | |||
| Correlation coefficient | .81 | .76 | .76 | 
| P | <.001 | <.001 | <.001 | 
| N | 31 | 29 | 29 | 
| Vincristine | |||
| Correlation coefficient | .80 | .56 | .64 | 
| P | <.001 | <.001 | <.001 | 
| N | 30 | 32 | 32 | 
| l-asparaginase | |||
| Correlation coefficient | .42 | .49 | .56 | 
| P | .017 | .006 | .002 | 
| N | 32 | 30 | 29 | 
| Daunorubicin | |||
| Correlation coefficient | .63 | .50 | .41 | 
| P | <.001 | .005 | .029 | 
|  N  |  29  |  31  |  29  | 
Drug .  | Δψm depolarization .  | Caspase-3 activation .  | PARP inactivation .  | 
|---|---|---|---|
| Prednisolone | |||
| Correlation coefficient | .81 | .76 | .76 | 
| P | <.001 | <.001 | <.001 | 
| N | 31 | 29 | 29 | 
| Vincristine | |||
| Correlation coefficient | .80 | .56 | .64 | 
| P | <.001 | <.001 | <.001 | 
| N | 30 | 32 | 32 | 
| l-asparaginase | |||
| Correlation coefficient | .42 | .49 | .56 | 
| P | .017 | .006 | .002 | 
| N | 32 | 30 | 29 | 
| Daunorubicin | |||
| Correlation coefficient | .63 | .50 | .41 | 
| P | <.001 | .005 | .029 | 
|  N  |  29  |  31  |  29  | 
Freshly isolated ALL cells were cultured for 18 hours in the presence of 50 μg/mL vincristine or 2.0 μg/mL daunorubicin or 42 hours in the presence of 250 μg/mL prednisolone or 10 IU/mL l-asparaginase. Drug-induced activation of apoptotic parameters was determined by flow cytometry. Correlation between apoptotic parameters was calculated using the Spearman rank correlation test.