While other FH tumors show differentiation/maturation within the age–appropriate framework, tumor differentiation/maturation is prompted by the “cross-talk” supported by critical signaling pathways, such as trkA/NGF signaling and Nrg1/ErbB signaling, between neuronal tumor cells and Schwannian stromal cells [14,15,16]. Here, NTRK1 is linked to neoplasm.