MYCN and neuroblastoma: We compared the expression signature of tumors (total number = 16: 10 with MYCN‐high and 6 with MYCN‐low) to DTCs (total number = 42: 16 with MYCN‐high and 26 with MYCN‐low) in a non‐paired manner and found that the expression levels of neuroblastoma hallmark genes MYCN and PHOX2B were retained in DTCs.