If the cut-off value of the RPA2-Ab level was determined to be 0.275, the sensitivity and specificity of the antibody level for the diagnosis of stroke were 0.703 (95% CI: 0.612-0.784) and 0.917 (95% CI: 0.730-0.990), respectively (Figure 4A and E). This evidence concerns the gene RPA2 and stroke disorder.