Table 1.

Characteristics of the analyzed NB microarray data sets

Study	Accesion No.	Platform	Samples	Stages	MYCN
Łastowska et al., 2007 [15]	GEO: GSE13136	Affymetrix HG-U133 Plus 2.0 Array	30 neuroblastoma	Stage 1: 4, Stage 2: 2, Stage 3: 1, Stage 4: 20, Stage 4S: 3	MYCN-amplified: 10, MYC-non-amplified: 20
Hiyama et al., 2004 [13]	GEO: GSE16237		51 neuroblastoma	Stage 1: 21, Stage 2: 6, Stage 3: 5, Stage 4: 13, Stage 4S: 6	MYCN-amplified: 7, MYC-non-amplified: 44
Janoueix-Lerosey et al., 2008 [14]	GEO: GSE12460		52 neuroblastoma, 8 ganglioneuroblastoma, 3 ganglioneuroma, 1 unknown	Stage 1: 10, Stage 2: 10, Stage 3: 7, Stage 4: 16, Stage 4S: 8, unknown: 1	MYCN-amplified: 14, MYC-non-amplified: 32, unknown: 6
Wilzén et al., 2009 [10]	ArrayExpress: E-MEXP-2250	Affymetrix HG-U133A Array	6 neuroblastoma	Stage 1: 1, Stage 2: 1, Stage 3: 4	unknown: 6
De Preter et al., 2006 [12]	ArrayExpress: E-MEXP-669		18 neuroblastoma, 3 adrenal cortex, 3 adrenal neuroblast	Stage 1: 4, Stage 3: 3, Stage 4: 10, Stage 4S: 1	MYCN-amplified: 5, MYCN-non-amplified: 13
Albino et al., 2008 [11]	GEO: GSE7529		10 neuroblastoma, 3 ganglioneuroblastoma, 6 ganglioneuroma, 9 microdissected tumors	unknown: 10	unknown: 10
Staege et al., 2004 [16]	GEO: GSE1825		5 neuroblastoma, 5 Ewing family tumor	Stage 1: 3, Stage 3: 1, Stage 4: 1	unknown: 5
Wang et al., 2006 [9]	GEO: GSE1825	Affymetrix HG-U95 Version 2 Array	101 neuroblastoma, 1 fetal brain	Stage 1: 28, Stage 3: 23, Stage 4: 50	MYCN-amplified: 20, MYCN-non-amplified: 81