GSTM1 and neuroblastoma: In the multivariate analysis, the AMC × ALC < 1 × 106 (/μl)2 was the only independent risk factor for poorer PFS in patients with high-risk neuroblastoma (HR 3.97, 95%CI; 1.14–13.76, p = 0.030), in contrast to Hb < 10 g/dl (HR 1.76, 95%CI; 0.49–6.30, p = 0.383) and ferritin ≥ 350 ng/ml (HR 2.57, 95%CI; 0.52–12.78, and p = 0.248; Table 4).