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Acute lymphocytic leukaemia. Acute lymphocytic leukaemia (ALL) is a haematological malignancy of the lymphoid progenitor cells. Enhanced genetic analyses have led to the identification of over 23 subtypes of B-cell and 17 subtypes of T-cell ALL. In parallel, the development of highly sensitive measurable residual disease assays have refined disease monitoring and risk stratification. Breakthroughs in molecular therapeutics and immunotherapies have improved treatment efficacy while reducing toxicity, challenging the traditional notion of 2·5-3 years of intensive chemotherapy. Notable progress includes the use of more potent BCR::ABL1 tyrosine-kinase inhibitors, and antibodies targeting CD19 and CD22 leukaemia surface antigens, which have delivered unprecedented outcomes in BCR::ABL1-positive ALL. Historically, adults have had poorer outcomes than paediatric cases, largely due to the higher prevalence of adverse genetic subtypes and less favourable genetic subtypes. However, development of new therapies has improved overall survival in B-cell ALL to approximately 80-90%, even in adult and infant populations. Chimeric antigen receptor T-cell therapies have also transformed outcomes for children with refractory or relapsed ALL and are now being incorporated into the front-line treatment of adult ALL. These innovations hold the promise of increasing the cure rates while reducing reliance on intensive chemotherapy and allogeneic stem-cell transplantation.