<prompt> Which of the following is not a poor prognostic factor in neuroblastoma?MYCN amplificationHigh mitosis-karyorrhexis indexEvidence of gangliocytic differentiationMutations of neuritogenesis genes  <response>: Unourable prognostic factors in neuroblastoma: Stage 3, 4 Age 18 months Absence of evidence of schwannian stroma and gangliocytic differentiation High Mitosis-karyorrhexis index 2005000 cells Near-diploid segmental chromosome losses; chromothripsis MYCN Amplified Chromosome 1p loss Chromosome 11q loss Absent TRKA expression Presence of TRKB expression Mutations of neuritogenesis genes 