IFN-γ was also analyzed in the 4 groups (Figure 2(d)), with high expression in the reaction-free leprosy PB (2.70 ± 0.37) and MB (1.49 ± 0.30) in contrast to the low expression in the groups with T1R (0.39 ± 0.14) and ENL (0.46 ± 0.20), with significant differences among the reaction-free leprosy PB group and the groups with T1R (p < 0.001) and ENL (p < 0.001). The gene discussed is IFNG; the disease is leprosy.