Human neuroblastoma is the most frequent solid tumor in children. Rece
nt studies suggest that a multiplicity of genomic alterations contribu
tes to neuroblastoma, the most frequent and well studied being deletio
n of the short arm of chromosome 1 and amplification of N-MYC. We here
present and discuss different patterns of oncogene activation includi
ng, amplification of N-MYC, duplication of N-MYC and amplification of
MDM2.