Von Wussow et al. showed that IFNα was detectable in the sera of 15% (9/61) of SLE patients by bioassay with titers between 6 and 40 IU/mL, whereas IFNα was detectable in 28% (17/61) of patients by radioimmunoassay [86]. Here, IFNA1 is linked to systemic lupus erythematosus.