Consistent with the relatively low expression of PGBD5 in PDX1 neuroblastoma tumor (Fig. 7B), we found that single-agent treatment with AZD6738 or cisplatin had no effect, whereas combination of AZD6738 with cisplatin exhibited significant reduction in tumor growth, as compared to single-agent or vehicle control treatments (P = 1.9 × 10−3; Fig. 7C).