title: Why are small-bowel tumours so rare.
mesh_terms: D006801:Humans; D007413:Intestinal Mucosa; D007414:Intestinal Neoplasms / Q000453:epidemiology*; D007421:Intestine, Small; D009362:Neoplasm Metastasis / Q000517:prevention & control; D009369:Neoplasms / Q000517:prevention & control; D012216:Rheumatic Diseases / Q000188:drug therapy; D014020:Tissue Extracts / Q000627:therapeutic use*
chemical_list: D014020:Tissue Extracts