Malignant ileocaecal serotonin-producing carcinoid tumours: the presence of a solid growth pattern and/or Ki67 index above 1% identifies patients with a poorer prognosis - Cunningham, J L; Grimelius, L; Sundin, A; Agarwal, S; Janson, E T (Acta oncologica (Stockholm, Sweden), 2007)