Celiac that do not remain on a gluten-free diet can develop Refractory Sprue. Refractory Sprue and Collagenous Sprue patients who initially respond to a gluten-free diet many subsequently relapse despite maintaining their diet. Such patients are then refractory to further dietary therapy. In contrast, others are refractory to dietary therapy from its inception and, assuming they are truly on a gluten-free diet, may not have celiac disease; these patients are said to have unclassified Sprue. Some refractory patients with celiac disease, typical or atypical, respond to treatment with corticosteroids or other immunosuppressive drugs. In others, there is no response and