NTRK1 and non-small cell lung carcinoma: The most common gene fusions in NSCLC involve three genes codifying membrane receptors, namely anaplastic lymphoma receptor tyrosine kinase (ALK) (5–7% frequency), ROS proto‐oncogene 1, receptor tyrosine kinase (ROS1) and ret proto‐oncogene (RET) (1–2% each); while neurotrophic receptor tyrosine kinase 1/2/3 (NTRK1/2/3) fusions are rare (< 0.1%).