TGFB1 and lung cancer: Furthermore, the presented results correspond with data collected from in vitro studies, wherein calcitriol inhibits EMT induced by TGFβ, among others, through modulation of expression of Snail in rat alveolar epithelial cells [57], human bronchial epithelial cells [58], and human lung cancer A549 cells—a model of type II alveolar epithelial cells [59].