Chemotherapy‐related toxicities follow a typical pattern in children treated for acute lymphoblastic leukaemia.

Aim: Acute lymphoblastic leukaemia (ALL) therapy has been associated with a significant burden of toxicities. The aim of this study was to describe the full spectrum of toxic effects associated with childhood ALL. Methods: Toxicity‐related data were collected from the Nordic Society of Paediatric Haematology and Oncology (NOPHO) ALL‐2008 toxicity registry, in which data on 19 clinically relevant toxicities were registered during ALL treatment, and from patient medical records. All patients treated according to the NOPHO ALL‐2008 protocol in Oulu University Hospital between 2008 and 2020 were included in the study. Results: The cohort consisted of 73 patients, 38 of whom were male. Mean age at diagnosis was 6.6 ± 4.2 (range 1.4–16.0) years. All but one of the patients developed at least one treatment‐related toxicity and more than half had multiple toxicities. Female sex and older age were associated with a higher tendency towards toxicity. The most common toxicity was vincristine‐induced peripheral neuropathy, which was observed in 70 patients. Most toxicities were moderate or severe, but even mild toxicities often affected leukaemia treatment. Conclusion: Moderate and severe treatment‐related toxicities are common, and most toxicities occur in a typical pattern in relation to the treatment phases. [ABSTRACT FROM AUTHOR]