cGVHD high BAFF/B-cell ratio is associated with an increased in mean B-cell division. (A) Plasma concentration of BAFF and LOG(BAFF/CD19⁺) in healthy donors (n = 20) and BAFF cohort patients with (n = 34) or without cGVHD (n = 26) at month 12 post allo-HSCT. (B) Correlation between the number of cell divisions and BAFF concentration by CD19⁺ cell in healthy donors (n = 20) and patients with (n = 29) or without cGVHD (n = 23) at month 12 post allo-HSCT. *P < .05; ***P < .001; NS, not significant (Mann-Whitney).