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Clinical and laboratory features of de novo acute myeloid leukaemia with trilineage myelodysplasia

Primary myelodysplastic syndromes progress to acute myeloid leukaemia (AML) in about 30% of cases. We have sought evidence of pre‐existing trilineage myelodysplasia (TMDS) using the FAB criteria (1982) in 160 consecutive cases of primary de novo AML. TMDS was found in 24 cases (15%) including two of 33 cases of Ml (6%), four of 40 cases of M2 (10%), none of 18 cases of M3, five of 31 cases of M4 (15%), six of 30 cases of M5 (20%), all of six cases of M6 and one of two cases of M7.