FcRn expression has long been considered ubiquitous without quantification, but variations in FcRn levels have been described in leucocytes of lupus patients (15), in peripheral blood mononuclear cells of patients with pancreatic ductal adenocarcinoma (16) and in tumor cells leading to metabolic changes (17, 18). The gene discussed is FCGRT; the disease is systemic lupus erythematosus.