PLA2G7 and chronic obstructive pulmonary disease: As shown in Figure 5D, PLA2G7 expression was significantly higher in the blood of COPD patients than in that of non-COPD controls (including 94 patients with COPD and 42 non-COPD controls from GSE42057 and 49 patients with COPD and 29 non-COPD controls from GSE56766).