CD8A and peripheral arterial disease: PAD patients in our cohort who were receiving IgRT had lower absolute counts of CD3+ T-cell (1,348.3 vs. 2,207.7 cells/uL; p=0.044) and CD8+ T-cell (443.1 vs. 781.9 cells/uL; p=0.043) as compared to those PAD patients not receiving IgRT.