ESR1 and idiopathic pulmonary fibrosis: Elliot et al. reported that ERα expression was increased in usual interstitial pneumonia (UIP)/idiopathic pulmonary fibrosis (IPF) and interstitial pneumonia tissues of bleomycin-treated mice and that pulmonary fibrosis was reduced by ERα inhibitors in bleomycin-treated mice; however, ERα expression was not significantly different between normal and interstitial pneumonia tissues [68].