GSTM1 and myelodysplastic syndrome: Diagnosis of MDS is based on the presence of one or more blood cytopenias (Hb < 10 g/dL, platelets < 100 × 109/L, neutrophils < 1.8 × 109/L), as a pre-requisite, plus one of the following: dysplastic features in ≥10% of nucleated cells in at least one lineage, <20% blasts in blood and bone marrow, >15% ring sideroblasts (RS) in bone marrow and characteristic cytogenetic or molecular findings [12].