General baseline characteristics and clinical data of patients and controls.
Variable | Value | |
---|---|---|
Patients | Controls | |
Age (yr, mean±SD) | 9.3±5.4 | 10.6±6.5 |
First decade (N) | 23 | 8 |
Second decade (N) | 17 | 7 |
Sex (male/female) | 1.2 | 1.5 |
Male (N) | 22 | 9 |
Female (N) | 18 | 6 |
WBCs in PB (×103/mL, mean±SD) | 81.4±40.2 | 11.2±5.7 |
<50 (N) | 15 | 15 |
>50 (N) | 25 | None |
BM blasts (%, mean±SD) | 79±17.7 | <5% |
25–50% (N) | 4 | None |
51–75% (N) | 7 | None |
76–100% (N) | 29 | None |
WHO classification (pre-B-ALL/early pre-B-ALL) | 1.5 | None |
Early pre-B-ALL (N) | 16 | None |
Pre-B-ALL (N) | 24 | None |
Abbreviations: ALL, acute lymphoblastic leukemia; BM, bone marrow; PB, peripheral blood; SD, standard deviation; WBC, white blood cell; WHO, World Health Organization.