In those experiments, ApoCell-PhI values obtained following the pretreatments with SS and SLE sera showed positive correlations with C3 and C4 complement levels (for SS sera; r = 0.510, p = 0.007 and r = 0.447, p = 0.02, respectively, for SLE sera; r = 0.467, p = 0.03 and r = 0.546, p = 0.008, respectively). Here, C4A is linked to systemic lupus erythematosus.