NTRK2 and cancer: In 2017, a comprehensive meta-analysis of 11 studies enrolling a total of 1516 patients by Zhang C. and coworkers collected important information about tyrosine kinase-associated receptor type B (TrkB) expression found in solid tumors including gastric [34,35,36], colorectal [37,38], nonsmall cell lung [39] and ovarian [40] cancers, nasopharyngeal [41], sinonasal and oral squamous cell [42,43], and hepatocellular [40] carcinoma.