CD8A and idiopathic pulmonary fibrosis: Recently, we shown that in IPF tissue, infiltrating CD8+ TLs are associated with the grade of dyspnoea and physiological indices of disease severity, implicating that they might play a role in its pathogenesis[9], and also that the CD8+ TLs recovered by bronchoalveolar lavage (BAL) relate to those in lung tissue[10].