| Training cohort (n = 50) | Validation cohort (n = 34) | ||
---|---|---|---|---|
 | CCR (n = 28) | Relapse (n = 22) | CCR (n = 25) | Relapse (n = 9) |
Sex | ||||
   Male/Female | 21/7 | 21/1 | 14/11 | 9/0 |
Age at diag (years) | ||||
   Median (Range) | 13.1 (2.1-16.9) | 12.1 (1.8-17.8) | 7.1 (2.2-18.3)* | 8.8 (1.8-17.5) |
WBC (×10 9 /L) | ||||
   Median (Range) | 171.9 (1.1-791) | 219.2 (4.9-700) | 113.1 (8.2-524.4) | 161.8 (13.4-882) |
BM blast at diag (%) | ||||
   Median (Range) | 94 (70-100) | 91 (74-99) | 90 (35-99) | 95 (70-99) |
Cytogenetics | ||||
   Normal (46 C) | 2 | 3 | 13 | 4 |
   Pseudodiploid (46 C) | 12 | 6 | 5 | 2 |
   Hyperdiploid (>47 C) | 3 | 2 | 3 | 0 |
   Hypodiploid (<46 C) | 0 | 0 | 2 | 1 |
   N/A | 11 | 11 | 2 | 2 |
NCI Risk | ||||
   Standard | 0 | 0 | 6 | 1 |
   High | 28 | 22 | 19 | 8 |
Induction result | ||||
   M1 | 25 | 19 | 24 | 8 |
   M2 | 3 | 0 | 0 | 0 |
   M3 | 0 | 0 | 0 | 0 |
   N/A | 0 | 3 | 1 | 1 |
Follow-up time (years) | ||||
   Median (Range) | 7.3 (3.3-9.2) |  | 8.8 (4.3-11.9) |  |
Time to relapse (years) | ||||
   Median (Range) |  | 1.3 (0.2-3.8) |  | 1.4 (0.5-3.3) |