Cytogenetics: t(6;9) translocation and nonspecific esterase positivity of 90%. Which AML subtype is suggested?

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Nonspecific esterase positivity points to monocytic differentiation. When a translocation such as t(6;9)(p23;q34) is present, it aligns with AMLs that show monocytic or mixed monocytic–myeloid features, rather than purely granulocytic or promyelocytic patterns. The acute myelomonocytic leukemia category (M4) encompasses both myeloid and monocytic maturation, which fits a monocytic-dominant profile with high NSE staining. Although acute monocytic leukemia (M5) also centers on monocytic lineage, the specific t(6;9) cytogenetic abnormality is more characteristically associated with AMLs with monocytic differentiation seen in M4 rather than the M5 subset described by other translocations. Therefore, the combination of t(6;9) and strong NSE positivity most coherently points to the M4 subtype, reflecting both lineages and the cytogenetic marker.