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Nineteen patients with high‐risk myelodysplastic syndrome (MDS)/acute myeloid leukaemia (AML) received fludarabine, cytarabine, granulocyte‐colony stimulating factor (G‐CSF), and idarubicin chemotherapy (de novo MDS/MDS‐AML, nine; relapsed/refractory MDS/AML, seven; therapy‐related MDS, three). Median age was 44 years and median disease duration 10 months. 16/19 (84%) patients had abnormal cytogenetics with seven (37%) harbouring abnormalities of chromosome 7. 18/19 (94.7%) patients responded to FLAG‐idarubicin with 12 (63%) achieving complete remission (CR) (<5% blasts and normal cytogenetics). 7/9 (78%) patients with de novo MDS/MDS‐AML achieved CR compared to 5/10 (50%) with alternative diagnoses. Response was associated with age < 50 years, disease duration < 3 months, and cytogenetics other than abnormalities of chromosome 7. Haemopoietic regeneration was …