MYCN and neuroblastoma: Between the high- and low-risk subgroups, the difference in age, COG risk, MYCN status, and Inss stage in the GSE49711 cohort, difference in age, sex, MYCN status, Inss stage, ploidy, histology, COG risk, and MKI in the TARGET-NB cohort, and difference in age, 1p del/im, and MYCN status in the E-MTAB-8248 cohort were statistically significant (P < 0.05).