BTLA and lupus nephritis: There was also no significant difference in the expression of BTLA on stimulated Th2-cells neither in comparison of healthy controls versus SLE patients with lupus nephritis (63.2% ± 11.5% vs. 64.4% ± 27.5%, p = 0.80) nor in the comparison of healthy controls versus SLE patients without lupus nephritis (63.2% ± 11.5% vs. 56.0% ± 15.2%, p = 0.45) nor the comparison of SLE patients with lupus nephritis versus SLE patients without lupus nephritis (64.4% ± 27.5% vs. 56.0% ± 15.2%, p = 0.52).