This guideline presents recommendations for the management of coeliac disease (CD) and other gluten-related disorders both in adults and children. There has been a substantial increase in the prevalence of CD over the last 50 years and many patients remain undiagnosed. Diagnostic testing, including serology and biopsy, should be performed on a glutencontaining diet. The diagnosis of CD is based on a combination of clinical, serological and histopathological data. In a group of children the diagnosis may be made without biopsy if strict criteria are available. The treatment for CD is primarily a gluten-free diet (GFD), which requires significant patient education, motivation and follow-up. Slow-responsiveness occurs frequently, particularly in those diagnosed in adulthood. Persistent or recurring symptoms necessitate a review of the original diagnosis, exclude alternative diagnoses, confirm dietary adherence (dietary review and serology) and followup biopsy. In addition, evaluation to exclude complications of CD, such as refractory CD or lymphoma, should be performed. The guideline also deals with other gluten-related disorders, such as dermatitis herpetiformis, which is a cutaneous manifestation of CD characterized by granular IgA deposits in the dermal papillae. The skin lesions clear with gluten withdrawal. Also, less well-defined conditions such as non-coeliac gluten sensitivity (NCGS) and gluten-sensitive neurological manifestations, such as ataxia, have been addressed. Newer therapeutic modalities for CD are being studied in clinical trials but are not yet approved for use in practice.

Background: Coeliac disease may be regarded as refractory disease (RCD) when symptoms persist or recur despite strict adherence to a gluten-free diet. RCD may be subdivided into types I and II with a phenotypically normal and aberrant intraepithelial T-cell population, respectively. RCD I seems to respond well to azathioprine/prednisone therapy. RCD II is usually resistant to any known therapy and transition into enteropathy-associated T-cell lymphoma (EATL) is common. Aim: To provide further insight into RCD and the development of EATL, by reporting on long-term survival and risk of transition of RCD into EATL in a large cohort of patients with complicated coeliac disease. Design and Methods: Retrospective comparison of responses to therapy in four groups of patients with complicated coeliac disease: 43, RCD I; 50, RCD II (total), of whom 26 with RCD II developed EATL after a period of refractoriness to a gluten-free diet (secondary EATL) and 13 were EATL patients without preceding history of complicated coeliac disease (de novo EATL). Results: No coeliac-disease-related mortality was recognised in the RCD I group. The overall 5-year survival in the RCD I group it was 96%; in the RCD II (total) group was 58%; and in the RCD II group after developing EATL it was only 8%. The 2-year survival in the de novo EATL group was 20% versus 15% in secondary EATL group (p = 0.63). Twenty-eight (56%) of the 50 patients with RCD II died, 23 (46%) due to EATL, 4 due to a progressive refractory state with emaciation and 1 from neurocoeliac disease. Conclusion: Remarkably, no patient with RCD I developed RCD II or EATL within the mean follow-up period of 5 years (range 2-15 years). A total of 52% of the RCD II patients developed EATL within 4-6 years after the diagnosis of RCD II. More aggressive and targeted therapies seem necessary in RCD II and EATL.

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EATL is a rare disease with an incidence of 0.10 per 100,000 inhabitants per year, occurring in older age, with a peak incidence in the 7th decade. The tumour is mainly localized in the proximal small intestine. Although uncomplicated CD is twice as frequent in female patients, EATL is more prevalent in males.