A simple logistic regression analysis for serum chemokine concentrations showed that low serum levels of MCP-1 (p = 0.029; OR = 0.15, 95% CI = 0.02–0.82) and IL-8 (p = 0.05; OR = 0.20, CI 95% = 0.03–1.05) were associated with a decrease in the risk of presenting neuroblastoma in INSS stage 3 and 4; however, for IL-8, the p value remained at the limit required to be considered statistically significant (Table 4). This evidence concerns the gene CXCL8 and neuroblastoma.