Table 1.

Characteristics of Patients With INSS Stage 1 or 2 Neuroblastoma and MYCNAmplification (N = 87)

Characteristic	Total		5-Year EFS			5-Year OS
	No.	%	%	SE	P	%	SE	P
Overall patients	87		53	8		72	7
INSS stage
1	48	55	50	12	.2760	76	9	.3568
2a/2b	39	45	57	12		67	11
Histology
Favorable	32	56	58	15	.2029	86	9	.1065
Unfavorable	25	44	40	18		62	19
Unknown	30
Ploidy
Hyperdiploid	17	44	82	20	.0069	94	11	.0056
Diploid	22	56	37	21		54	15
Unknown	48
1p
No loss or aberration	11	44	73	27	.4177	73	27	.4197
LOH or aberration	14	56	56	17		85	12
Unknown	62
LDH, U/L
< 580	32	51	63	12	.3522	83	9	.0883
≥ 580	31	49	48	14		62	14
Unknown	24
Age, days
< 547	54	62	58	10	.4320	77	8	.1798
≥ 547	33	38	45	14		63	14

Abbreviations: INSS, International Neuroblastoma Staging System; EFS, event-free survival; OS, overall survival; LOH, loss of heterozygosity; LDH, lactate dehydrogenase.