Prognostic factors in acute lymphoblastic leukaemia
| Category | Proportion | Features |
| Standard risk | 65% | Aged 1–9 years inclusive |
| Leucocyte count <50 × 109/l | ||
| No adverse cytogenetics | ||
| Higher risk | 25% | Aged >10 years |
| Leucocyte count >50 × 109/l | ||
| Highest risk | 8–9% | Infants under one year |
| Hypodiploidy, Ph′ chromosome | ||
| Poor response to induction | ||
| Special | 1–2% | B-ALL |