CD163 and systemic lupus erythematosus: CD163 is a transmembrane scavenger receptor (Law et al., 1993) and is known to be elevated in patients with systemic lupus erythematosus (Borgia et al., 2018), systemic juvenile idiopathic arthritis (Minoia et al., 2015), and Kawasaki disease (Garcia-Pavon et al., 2017).