Previously, by using the method of immunocytochemistry, TRKA has been detected in the nuclei of various cells, such as melanocytic tumors [64], ovarian carcinoma [65], human glioma cell line U251 [66], rat pheochromocytoma cell line PC12 and cultured hepatic stellate cells [67]. The gene discussed is NTRK1; the disease is central nervous system cancer.