MKI67 and myelodysplastic syndrome: When comparing the Ki-67 proliferation index of the nucleated erythroid cell population in the BM between the group of transfusion-dependent and that of transfusion-independent MDS patients (Figure 1A), a decreased Ki-67 proliferation index was seen in MDS patients that developed transfusion-dependence as compared to those that did not (P = 0.027).