Figure 2.

LncRNA ANRIL could distinguish AECOPD patients from stable COPD patients and HCs. LncRNA ANRIL could distinguish total COPD from HCs (A); lncRNA ANRIL could not distinguish stable COPD patients from HCs (B); lncRNA ANRIL could distinguish AECOPD patients from HCs (C); lncRNA ANRIL could distinguish AECOPD patients from stable COPD patients (D). Receiver operating characteristic curves were used to distinguish AECOPD patients and stable COPD patients from HCs, as well as distinguish AECOPD patients from stable COPD patients. LncRNA ANRIL, long noncoding RNAs antisense noncoding RNA in the INK4 locus; HCs, healthy controls; COPD, chronic obstructive pulmonary disease; AECOPD: acute exacerbations of chronic obstructive pulmonary disease