Table 1. Main features of the cohorts of NB patients analyzed for gene expression profiling, BM smears, flow cytometry and cell blood count (CBC).

	NB patients
	Gene expression	%	BM smear	%	Flowcytometry	%	CBC	%
N	44		70		16		115
Sex
Female	17	38.6	33	47.1	9	56.2	51	44.3
Male	27	61.4	37	52.9	7	43.8	64	55.7
Age
< 18 months	24	54.5	33	47.1	10	62.5	55	47.8
≥18 months	20	45.5	37	52.9	6	37.5	60	52.2
Stage
L1/L2	34	77.3	20	28.6	10	62.5	64	55.7
M	10	22.7	37	52.8	6	37.5	38	33.0
Ms			13	18.6			13	11.3
MYCN
Amplified	6	13.6	22	31.4	4	25.0	28	24.4
Single copy	35	79.6	43	61.5	12	75.0	72	62.6
ND	3	6.8	5	7.1	0		15	13.0