GSTM1 and myelodysplastic syndrome: Therefore, we determined whether the Ki-67 proliferation index of nucleated erythroid cells in the BM at diagnosis (1) is significantly different in MDS patients that developed transfusion-dependence within 1 year after diagnosis compared to patients that did not and (2) is predictive for transfusion-dependence in MDS patients with mildly reduced Hb levels.