CD69 and coronary artery disorder: The results indicated that the level of serum LDL-C in CAD patients was significantly positively correlated with the percentage of γδ T cells in total CD3+ cells (r=0.3994, P= 0.0158) (Figure 6A), However, the level of serum LDL-C was significantly negatively correlated with the expression of CD69 (r=-0.4073, P=0.0137) on the surface of γδ T cells in peripheral blood (Figure 6B).