MYCN and neuroblastoma: The findings obtained revealed that NB subsets with a favorable prognosis generally possess the hyperdiploid karyotype of chromosomes, while other subsets with an unfavorable prognosis possess the diploid or tetraploid karyotype of chromosomes [5,6] and often have MYCN amplification [7], partial (segmental) deletions in chromosome arms 1p, 3p, 4p, and 11q, and partial gains in chromosome arms 1q, 2p, and 17q [8,9,10,11,12,13,14].