TNFSF13B and systemic lupus erythematosus: Therefore, the effect of BAFF on the efficiency of anti-CD20 mAbs at inducing BCD was assessed by comparing the CTI of anti-CD20 mAbs in samples incubated in the presence or absence of BAFF at 100 ng/ml in the whole blood assay using freshly drawn blood samples from patients with RA (n = 3) and SLE (n = 4).