TXK and hepatocellular carcinoma: Bone marrow X-linked kinase (BMX, also known as Etk) is an intracellular nonreceptor tyrosine kinase member of the Tec family, which includes five mammalian members: Btk (Bruton's tyrosine kinase) [7, 8], Itk (IL-2 inducible T-cell kinase) [9], BMX/Etk [10, 11], Tec (tyrosine kinase expressed in hepatocellular carcinoma) [12] and Txk (tyrosine-protein kinase TXK) [13].