70551 reported inhibitory activity in IMR32, a human neuroblastoma cell line in which N-Myc gene is amplified and actively expressed, at both 5 μM and 10 μM over 120 h, while it had minimal effect on the HO15.19, a N-Myc null cell line, although slight toxicity could be observed at 20 μM, as shown in Figure 4A,B. This evidence concerns the gene MYCN and neuroblastoma.