In addition, considering that P5 and P7 had an LD50 between 2 μM and 4 μM—while the cationic peptide lactoferricin B reported by Eliassen [2] affected the viability of both MYCN-amplified and not amplified NB cells with a LD50 values in the range 15.5–60 μM—it was conceivable that both cationic copolymers herein reported could be a very much more efficacious strategy with which to counteract NB progression and chemioresistance than the peptide previously reported [2]. The gene discussed is MYCN; the disease is neuroblastoma.