The ratio of CD3+CD4+/CD3+CD8+ in the secondary AIHA group (1.81 ± 0.41) was statistically higher than in the primary group (1.05 ± 0.12) (p = 0.025); there were no significant differences in the IgE levels and CD5+CD19+/CD19+ ratio between the two groups (p = 0.895, p = 0.088, respectively) (Table 4). The gene discussed is CD4; the disease is autoimmune hemolytic anemia.