Metachronous Small-Bowel Adenocarcinoma in Coeliac Disease: Gluten-Free Diet Is Not Protective

Coeliac disease is associated with an increased risk of certain gastrointestinal malignancies, especially of the small bowel. Metachronous malignancies are well established in the colon, where adenocarcinoma is common, but are exceptional in the small intestine. We describe a young woman with a long history of malabsorption who was shown to have coeliac disease complicated by a small-bowel adenocarcinoma. The cancer was resected, and the coeliac disease went into complete remission on a strict gluten-free diet. Fifteen years later she developed iron deficiency anaemia. Investigations showed a metachronous small-bowel adenocarcinoma but continuing remission of the coeliac disease. The case provides strong evidence against a causative role for the enteropathy of active coeliac disease in small-bowel adenocarcinoma and against a protective effect of a gluten-free diet in tumour development. Predisposition to adenocarcinoma in coeliac disease is probably genetic.