MYC and neuroblastoma: Taken together, the data on the growth suppressive effects of MIBG, shown in Fig. 1A, and the effects of MIBG on MYC/MYCN, shown in Fig. 2, indicate that with the exception of SY5Y cells, there was a correlation between the growth suppressive effects of MIBG at 10 and 20 μM and its effects on MYC and MYCN expression among the other 4 NB cell lines.