DDX1 and neuroblastoma: As suggested by other reports (17, 18), DDX1, a gene encoding for the Asp-Glu-Ala-Asp (DEAD) functioning ATPase DDX1 (17, 19), was the most recurrently coamplified passenger gene with MYCN in neuroblastomas (57.98%, 138 out of 238; Fig. 2C; Supplementary Fig. S1I).