Table 5. Characteristics of patients aged younger than 10, or 10 and older with CNS relapses.

Age at Relapse (years)	<10	≥10
n	78	45
CNS relapse (%)
Isolated	53 (68)	27 (60)
Combined	25 (32)	18 (40)
Gender
Male: Female	51∶27	37∶8
Time to Relapse (%)
median in months (range)	29 (5–92)	33 (6–90)
Late	18 (23)	14 (31)
Early	48 (62)	23 (51)
Very Early	12 (15)	8 (18)
Risk category
Standard	4 (5)	8 (18)
Intermediate	63 (81)	25 (55)
High	11 (14)	12 (27)
Immunophenotype
B:T	66∶12	31∶14
Cytogenetics (%)
progenitor-B cell
Good	32 (41)	11 (24)
Intermediate	18 (23)	11 (24)
Poor	5 (6)	6 (13)
Unknown	11 (14)	3 (7)
T-cell	12 (15)	14 (22)