Leukemic architecture as a framework for risk stratification in NPM1-mutated acute myeloid leukemia.

NPM1-mutated (NPM1c) acute myeloid leukemia (AML) has traditionally been considered a genetically defined entity associated with a favorable prognosis. However, growing evidence indicates that NPM1c AML comprises biologically and clinically heterogeneous disease states, in which NPM1c acts less as an autonomous prognostic determinant and more as a context-dependent organizer of leukemic architecture. Integrative transcriptomic and epigenomic studies have identified reproducible stemness-linked programs, including primitive and committed subtypes, the primitive phenotype being associated with inferior survival and increased relapse risk even within conventionally favorable groups. Single-cell and clonal architecture analyses further support a hierarchical model whereby early epigenetic lesions shape differentiation trajectories and constrain the phenotypic output of subsequent NPM1 and signaling mutations. In parallel, large-scale sequencing studies reveal non-random co-mutational patterns and variant allele frequency hierarchies, where epigenetic mutations frequently precede NPM1c and signaling alterations emerge later during leukemic evolution. Collectively, these findings support risk-stratification frameworks that integrate the leukemic cell state, transcriptional identity, and mutational hierarchy, moving from mutation-centric toward architecture-informed models for prognosis and therapeutic decision-making in NPM1c AML.