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Proportion of A PD-1 + CD4 + T lymphocytes and B PD-1 + CD8 + T lymphocytes measured in BAL samples obtained from patients with lung cancer (●, n = 14), ILD (■, n = 10) and asthma (▲, n = 10). Each data point represents one patient. Data are represented as mean with 95% CI and were tested for statistical differences using Kruskal–Wallis test with Dunn’s multiple comparison. * p < 0.05. BAL: bronchoalveolar lavage, ILD: interstitial lung disease, PD-1: programmed cell death protein 1
