CD8A and chronic obstructive pulmonary disease: In addition to data from previous studies demonstrating that the densities of both fibrocytes (Dupin et al., 2019) and CD8+ T cells (Saetta et al., 1999) are increased within the distal bronchi of COPD patients, we found that fibrocyte and CD8+ T cells are localized in close proximity in peribronchial areas, especially in tissues from patients with COPD.