GAS6 and systemic lupus erythematosus: GAS6 is a protein‐coding gene, and elevated levels of plasma GAS6 are found in numerous pathological conditions, including sepsis, obesity, chronic renal disease, cardiac hypertrophy, and systemic lupus erythematosus (Ekman et al., 2011; Lee et al., 2012; Wu et al., 2015; Zhao et al., 2016).