GZMK and systemic lupus erythematosus: As shown in Table 1, there was no significant difference observed in the percentage and MFI expression of CD45RA-CD197-CD8 + GZMK + T cells between SLE patients and normal controls (20.32 ± 1.872%, (N = 38) vs. 19.96 ± 1.685% (N = 25), p = 0.895; MFI: 3546 ± 273.9 (N = 38) vs. 3526 ± 192 (N = 25), p = 0.9589).