MKI67 and carcinoid tumor: A homogeneous Ki-67 labelling pattern was a significant feature of the low (<4%) Ki-67 subgroup (80/93, 86%, p < 0.02, Table 1, Fig. 2) as well as of the intermediate (4–9%) Ki-67 subgroup (32/40, 80%, p < 0.02, Table 1), whereas a heterogeneous Ki-67 pattern was preferentially seen in the subgroup of carcinoids with a proliferation index of ≥10% (11/29 assessable cases, 38%, p < 0.02, Table 1, Figs. 1 and 2).