Overall, gene fusion is a common genomic structural variation in PTC, targeting, besides RET, several other kinases, such as NTRK1, NTRK3 (N Tropomyosin Receptor Kinase), ALK (Anaplastic Lymphoma Kinase), HGFR (Hepatocyte Growth Factor Receptor), and BRAF (B Rapidly Accelerated Fibrosarcoma) [19,77]. This evidence concerns the gene ALK and fibrosarcoma.