Surgical ablation of BC cells results in the transgression of the MEP transition zone by motor neuron cell bodies (Vermeren et al., 2003), and inactivation of the BC and Schwann cell marker Krox20 leads to the ectopic presence of OLCs and astrocytes in the PNS (Coulpier et al., 2010). This evidence concerns the gene EGR2 and breast cancer.