Non-receptor tyrosine-protein kinase which phosphorylates DOK1 on tyrosine residues (PubMed:23822091). Also phosphorylates KHDRBS1/SAM68 and VIM on tyrosine residues (PubMed:29496907). Phosphorylation of KHDRBS1 is EGF-dependent (PubMed:29496907). ATP + L-tyrosyl-[protein] = ADP + H(+) + O-phospho-L-tyrosyl-[protein] Interacts (via the SH2 and SH3 domains) with DOK1 (PubMed:23822091). Interacts with KHDRBS1/SAM68 and VIM (PubMed:29496907). Localizes to punctate cytoplasmic structures. Highly expressed in most breast cancers (at protein level). The N-terminal region regulates its kinase activity. Belongs to the protein kinase superfamily. Tyr protein kinase family. SRC subfamily.