Table I.

Patients characteristics.

(No=68 patients) Age	Years
Average	6.5
Median	5.2
Range	0.9–17.6
Gender	N°	%
Male	38	56
Female	30	44
Immunophenotype
B lineage	58	85
T lineage	10	15
Molecular genetics
Negative	47	69
BCR/ABL	3	4
MLL/AF4	2	3
TEL/AML1	14	21
E2A/PBX1	2	3
Applied protocol
ALL IC BFM 2002	39	57
ALL IC BFM 2009	29	43
Prednisolone response
Good response	61	90
Poor response	7	10
Day 33 BM
M1	67	98
M2	0	0
M3	1	2
Risk group
Standard risk	11	16
Intermediate risk	47	69
High risk	10	15
Outcome
CR	59	87
Relapse	5	7
Death due to relapse	4	6

Good prednisolone response: <1000 leukoblasts per mm³, poor prednisolone response: >1000 leukoblasts per mm³, BM: bone marrow, M1:<5% leukoblasts in BM, M2: ≥5% <25% leukoblasts, M3: ≥25% leukoblasts, CR: complete remission