ITGAX and systemic lupus erythematosus: Frequencies of CD21−CD38− B cells showed a weak correlation with those of CD11c+ B cells in HD (r = 0.47, p = 0.024), but strong correlations in pSS (r = 0.82, p = 0.0001) and SLE (r = 0.84, p < 0.0001), respectively (Figure 2C).