CD68 and systemic lupus erythematosus: In the tubulointerstitium there was positive correlation between a higher TSI and the number of total CD68+ macrophages (r = 0.328; Fig. 5a) but also with the number of M2a-like (r = 0.446; Fig. 5c) and M2c-like macrophages (r = 0.420; Fig. 5e) when correlation with the TSI was tested independently of ISN/RPS lupus class.