Table 1

Comparison of characteristics of groups A and B

Variables	Group A (n=15)	Group B (n=15)	P value
Age at surgery mean (range), years	4.0 (1.2–7.5)	4.1 (0.8–12.8)	0.92
Age at diagnosis (months)
<18	2	5	0.15
>18	13	10	0.15
Male:female	4:11	11:4	0.01
Stage
3	4	0	0.1
4	11	15	0.1
Risk group
IR	4	5	0.29
HR	11	10	0.29
MYCN status
Amplification	1	2	0.39
No amplification	14	13	0.39
Other metastases
Bone	9	6	0.55
Bone marrow	9	5
Lymph nodes	6	8
Preoperative chemotherapy
Median (range) cycles	4 (2–11)	5 (2–10)	0.94

HR, high risk; IR, intermediate risk.