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Cytotoxic T lymphocyte‐associated antigen‐4 (CTLA‐4) is involved in immune and inflammation regulation. The present study aimed to investigate the association between CTLA‐4 and COPD. Data revealed that serum levels of CTLA‐4 were elevated in COPD patients, inversely correlated with lung function and positively correlated with serum C‐reactive protein levels in the COPD group. These findings suggest...
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