Adult Acute Lymphoblastic Leukaemia

ALL is a malignancy of lymphoid progenitor cells, with a bimodal incidence, peaking in early childhood and in older age. In children, ALL tends to have an excellent prognosis, with more than 85% of patients achieving long-term survival. The outcome of younger adults has improved considerably as well. However, overall survival decreases with age (Dores et al. 2012), partially due to the different genetic background of adult ALL, with a higher proportion of Philadelphia chromosome-positive (Ph+) ALL and Ph-like and KMT2A rearrangements in comparison to childhood ALL (Iacobucci and Mullighan 2017). The introduction of paediatric-inspired regimens has improved outcomes in adults, but these regimens are less tolerated in older patients (Curran and Stock 2015).