Tumours deriving from the ileum (median IRS: 0.50; mean IRS: 1.00) showed significantly lower SST4 expression than did those originating from the stomach (median IRS: 2.25; mean IRS: 3.55; Mann–Whitney test: p < 0.001), from the duodenum/jejunum (median IRS: 1.25; mean IRS: 2.42; Mann–Whitney test: p < 0.045), from the rectum (median IRS: 3.00; mean IRS: 2.69; Mann–Whitney test: p < 0.001), or from the pancreas (median IRS: 3.00; mean IRS: 3.17; Mann–Whitney test: p < 0.001). The gene discussed is SSTR4; the disease is neoplasm.