Compared with CeD patients on a GFD, adult untreated CeD patients at diagnosis had lower serum 25(OH)D, higher prevalence of mild-to-moderate 25(OH)D deficiency, higher serum PTH, higher prevalence of high PTH, and higher serum 1,25(OH)2D in the presence of similar levels of serum calcium and phosphorus groups. The gene discussed is PTH; the disease is cranioectodermal dysplasia.