MKI67 and gastrointestinal stromal tumor: Mitotic count (OR 16.657, 95% CI 7.164–49.916, P < 0.001), pathological risk grading (OR 3.485, 95% CI 2.416–5.206, P < 0.001), tumor hemorrhage (OR 2.796, 95% CI 1.521–5.208, P = 0.001), and necrosis (OR 2.968, 95% CI 1.584–5.635, P = 0.001) were pathological features associated with the expression level of Ki-67 in patients with GIST.