A moderate positive correlation (r = 0.40–0.58; p ≤ 0.004) of serum SCGB1A1 concentrations with pre-and post-bronchodilation FEV1 and FEV1/FVC was detected in BMS-COPD subjects (Figure 4a–c, Table 2). Here, SCGB1A1 is linked to chronic obstructive pulmonary disease.