CD8A and interstitial lung disease: T cell lymphocytosis was observed in all groups (PCP: 62.9 ± 17.5%; DI-ILD: 58.3 ± 24.5%; ICI-ILD: 50.4 ± 29.9%) with a higher tendency of CD4/CD8 ratio observed in DI-ILD compared to PCP and ICI-ILD (PCP: 1.13 ± 0.86; DI-ILD: 6.08 ± 6.06; ICI-ILD: 1.9 ± 1.40) (Figure 2A).