Leukemic subtype | Number of cases | Clinical characteristics |
---|---|---|
B-cell ALL, Hyperdiploid (> 50 chromosomes) | 17 | Around 25% of childhood ALL cases, favor-able prognosis, gains of chromosomes X, 4, 6, 8, 10, 14, 17, 18 or 21. |
B-cell ALL, TCF3/PBX1 gene fusion | 18 | Around 5% of cases, poor prognosis without intensive treatment, gene fusion corresponds to a balanced translocation between chromo- somes 1 and 19. |
B-cell ALL, ETV6/RUNX1 gene fusion | 20 | Around 25% of cases, favorable prognosis, gene fusion corresponds to a balanced trans- location between chromosomes 12 and 21. |
B-cell ALL, BCR/ABL1 gene fusion | 15 | Around 3% of cases, unfavorable prognosis, gene fusion corresponds to a balanced trans- location between chromosomes 9 and 22. |
B-cell ALL, MLL fusions | 20 | Around 80% of cases in infants, about 5% of older children, unfavorable prognosis, gene fusions correspond to various structural re- arrangements of chromosome band 11q23. |
T-cell ALL | 14 | Unfavorable prognosis. |