NTRK3 and neuroblastoma: Given that the full-length and the truncated form of TrkC may be differently expressed in favourable and aggressive neuroblastomas [12, 52], we used primers designed to differentiate between the splice variants of the full-length TrkC (TrkC-FL) and truncated TrkC form (TrkC-Trunc) that lack tyrosine kinase domain (Figure 8F, 8G).