However, again, we did not find a similar trend in the PD-1 MFI in both groups of participants: HVs (133.64 ± 30.74 vs. 135.50 ± 30.05; p = 0.6406) and SLE patients (129.65 ± 29.50 vs. 130.54 ± 26.94; p = 0.6441) (Figure 5B(b)). Here, PDCD1 is linked to systemic lupus erythematosus.