Table 1.

Clinical characteristics of the patients and the control subjects included in the study.

	First cohort (n=77)				Second cohort (n=122)
	Patients		Controls		Patients		Controls
	n	%	n	%	n	%	n	%
Gender
M	21	42.0	12	54.5	56	51.3	0	0
F	29	58.0	10	45.5	66	48.7	0	0
Age at diagnosis
<18 months	21	42.0			53	43.4	0	0
>=18 months	29	58.0			69	56.5	0	0
INSS stage
L1	25	50.0	0	0	11	9.0	0	0
L2	2	4.0	0	0	51	41.8	0	0
M	22	44.0	0	0	53	43.4	0	0
MS	1	2.0	0	0	7	5.7	0	0
MYCN status
Amplified	11	22.0	0	0	28	22.9	0	0
Not amplified	30	60.0	0	0	87	71.3	0	0
na	9	18.0	0	0	7	5.7	0	0
Event overall
yes	2	4.0	0	0	20	16.3	0	0
no	48	96.0	0	0	100	81.9	0	0
na	0	0.0	0	0	2	1.6	0	0
Overall survival
mean (std dev)	455 (395)		0	0	1111 (369)		0	0