PARP1 and neuroblastoma: We corroborated these data analysing the gene expression variation, using genome‐wide expression and SNP arrays of NB tumours, demonstrating that the SNP affects the expression of PARP1. In particular, the presence of the protective allele G correlated with decreased PARP1 mRNA expression in a set of 17 NB cell lines (Figure 3A; P = .0003).