The patients with small intestinal tumors were older (median 61 vs. 57 and 55 years; p < 0.001), had a lower Ki-67 index (10% of values >20% vs. 24%, and 26%; p < 0.001), and were more likely to have functional tumors (53% vs. 17% and 26%; p < 0.001) than those with tumors from other sites. Here, MKI67 is linked to small intestine neoplasm.