Fig. 6From: Downregulation of the PD-1/PD-Ls pathway in peripheral cells correlates with asbestosis severityCorrelations between PD-1+CD8+ T cell fractions with CD28+CD8+ T cell fractions. The PD-1+CD8+ T cell fraction positively correlated with the CD28+CD8+ T cell fraction in the PB of patients with asbestosis (r = 0.464, P = 0.019) (a) or silicosis (r = 0.510, P = 0.032) (b)Back to article page