CD27 and idiopathic pulmonary fibrosis: Analogous results have been observed for CD27-positive Tc cells during all stages of differentiation – before vaccination, the ratios of: naïve (0.46% vs 0.16%; p=0.03), CM (0.29% vs 0.06%; p=0.009), EM (0.39% vs 0.07%; p=0.003), as well as TEMRA (0.67% vs 0.21%; p=0.01) cells were higher in IPF patients when compared to healthy counterparts.