Paricalcitol, an analog of vitamin D and a specific activator of vitamin D receptors (VDR), reduced PDF-induced peritoneal fibrosis in murine PD and decreased peritoneal IL-17A levels but not of other cytokines, including IL-1β, IL-2, IL-4, IL-5, IL-6, IL-10, TNF-α, IFN-γ, and TGF-β1. The gene discussed is TGFB1; the disease is Peritoneal Fibrosis.