CD8A and chronic obstructive pulmonary disease: A lower proportion of CD8 cells from COPD patients were positively immunostained for CD247 compared to S and HNS; median 73.1, 83.8 and 89.1% respectively (Kruskal-Wallis p = 0.02, Dunn’s multiple comparisons test COPD vs HNS p<0.05).