LTK (Leukocyte Receptor Tyrosine Kinase) is a Protein Coding gene. Diseases associated with LTK include Lymphatic System Cancer. he protein encoded by this gene is a member of the ros/insulin receptor family of tyrosine kinases. Tyrosine-specific phosphorylation of proteins is a key to the control of diverse pathways leading to cell growth and differentiation. Multiple transcript variants encoding different isoforms have been found for LTK .