Background/aims: The United Kingdom (UK) acute lymphoblastic leukaemia (ALL) 97/99 clinical trial compared 6-mercaptopurine (6MP) with 6-thioguanine (6TG) as maintenance therapy for childhood ALL. Review of interim results has led to discontinuation of the 6TG arm.
Methods: We report six children with ALL, who presented with splenomegaly after a median (range) treatment duration of 12 (6-22) months. All these children were treated in the 6TG-arm.
Results: The median (range) age at presentation was 6.6 (3.2-11.5) years. There were five boys. The presenting features were splenomegaly in all and hepatomegaly in four. AST was abnormal in one (80 IU/l, normal range 10-50). Abdominal sonography showed an altered texture of the liver parenchyma and confirmed splenomegaly. Microscopy showed findings within the spectrum of occlusive venopathy and nodular regenerative hyperplasia (NRH). After a median (range) follow-up of 23 (4-36) months splenomegaly and thrombocytopenia, suggestive of progressive portal hypertension, continue to worsen in all children.
Conclusions: 6TG is associated with chronic hepatic toxicity and progressive portal hypertension on follow-up. Microscopy showed NRH in all patients with features in keeping with an intrahepatic occlusive venopathy and variable parenchymal atrophy and loss.
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