Lessons from 50 years of curing childhood leukaemia.

One of the great success stories of modern medicine is undoubtedly the remarkable improvement in outcome for childhood cancer, achieved through the work of the co-operative groups enrolling patients in randomised controlled trials. In 1965, survival was almost zero; now 5-year survival rates exceed 80% in high-income countries. The lessons learned in the care of patients with the most common malignancy in childhood--acute lymphoblastic leukaemia--have been used in all other cancers of childhood and more recently in the management of adults.