The growth arrest-specific 6 (GAS6) protein is a gamma-carboxyglutamic acid (Gla)-containing protein and a member of a family of plasma vitamin K-dependent proteins. GAS6 is involved in vascular homeostasis, cell proliferation, apoptosis, leukocyte migration, and platelet aggregation (1,2). GAS6 is the ligand for the type I transmembrane receptor tyrosine kinase receptors Tyro3, Axl, and Mer (3). This gene is frequently overexpressed in many cancers and has been implicated as an adverse prognostic marker (4). Elevated protein levels are additionally associated with a variety of disease states, including venous thromboembolic disease, systemic lupus erythematosus, chronic renal failure, and preeclampsia (2).