MYCN and neuroblastoma: To further examine the prognostic significance of the imprinted DMRs in low-risk NB group, i.e. the cases that were MYCN non-amplified and 11q-normal (no amplification of MYCN and no deletion of 11q), we compared their survival probabilities and found that the imprinted DMRs were able to further stratify MYCN non-amplified and 11q-normal NB cases.