H19 and pulmonary fibrosis: By contrast, lncRNAs such as lncCHRF, n341773 and H19 contribute to lung fibrosis by acting as miRNA sponges.27 Based on our previous studies, competing endogenous RNAs are present not only in lncRNAs but also in circRNAs.19, 43 In this study, we showed the existence of competing endogenous RNAs under drug action.