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]. This evidence concerns the gene SNAI1 and lung cancer.