| Summary: | The treatment of children diagnosed with acute lymphoblastic leukemia (ALL) has improved significantly over
recent decades, with 5-year event-free survival (EFS)
approaching 85% [1]. However, 5-year EFS for infants
diagnosed at less than 1 year of age with MLL-rearranged
ALL remains less than 40% [2]. MLL-rearranged infant
ALL is both clinically and biologically distinct from other
childhood ALL subtypes, which is reflected by a unique
gene expression profile [3], a remarkably silent mutational
landscape [4], and pronounced resistance to currently
applied chemotherapeutics [5].
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