Table 4. Children's Oncology Group ALL Relapse Risk Stratification for B-Precursor ALLa
| Isolated CNS or Testicular Relapse | Bone Marrow or Combined Relapse | |
| <18 months from diagnosis | Intermediate risk | High risk |
| 18–36 months from diagnosis | Low risk | High risk |
| >36 months from diagnosis | Low risk | Intermediate risk |
| ALL = acute lymphoblastic leukemia; CNS = central nervous system. | ||
| aAll relapsed T-cell ALL is considered high risk. |
