TRK pan [B3]

TRK proto-oncogene encodes a tyrosine protein kinase, Trk A, Trk B and Trk C. The three family members are activated by different neurotrophins: TrkA is activated by Nerve growth factor (NGF), TrkB by Brain-derived neurotrophic factor (BDNF) or neurotrophin-4 (NT-4) and TrkC by NT-3. Neurotrophin signalling activates cellular pathways involved in the development and the maturation of the central and peripheral nervous systems through regulation of proliferation, differentiation and survival of sympathetic and nervous neurons. NTRK fusions result in NTRK3-ETV6 pairs in 90% of cases, most commonly found in Carcinomas and Sarcomas of the Mammary and Salivary Secretory Glands. NTRK gene fusions are also found in Brain primary tumors and metastases, Lung, Breast, Papillary Thyroid Carcinoma, Colorectal and Pancreatic cancer. NTRK mesenchymal tumors have multiple morphological features and coexpression of S100, CD34, and TRK pan.