Psychological effects of chronic childhood diseases In common with children who have other chronic diseases, those with leukaemia experience a great many restrictions and disadvantages; school life is inevitably interrupted, and many children miss several months schooling immediately after diagnosis.' 2 All children are regularly absent during the course of their treatment either for routine hospital appointments, because of minor infections, or because of outbreaks of contagious diseases-such as measles or chickenpox-among the other children. Such interruptions can have adverse consequences both for their academic achievements and for social relationships. Continued absences mean that the children miss essential lessons, and are continuously behind in written work. Circles of friends may regroup and exclude ill children, who may also return to school changed people, both in appearance and in character. A feeling of isolation can reduce the children's sense of belonging to the school and their participation in activities. Other factors, too, work against chronically sick children in the classroom. Teachers are poorly informed about the implications of disease and may feel reticent about having to teach such children. Many fail to understand the nature of medical complications, and worry that they will be unable to deal with medical emergencies should they arise. A great deal has also been written about the extent to which teachers have reduced expectations about how far chronically sick children should participate in all school activities, or perform academically. These dilemmas have been noted particularly among teachers of children with asthma3 and diabetes,4 as well as among teachers generally.5 Teachers also tend to rate children with cancers as less sociable and more isolated and withdrawn than their healthy peers.6 Parents, too, may communicate to sick children that school attendance and academic achievement are less important after the diagnosis of a chronic condition. Many parents report that such diagnoses force them to put their various ideas into perspective, and acknowledge the importance of less materialistic and competitive ideals.7 Children with chronic diseases typically experience some restrictions of activities, especially in terms of mobility or participation in sports activities. This applies no less to those with leukaemia. Given these restrictions and disadvantages, it should not be surprising that children with chronic diseases commonly show deficits in intellectual achievements,8 9 10 and in behavioural and social functioning. 1" Certain 'risk' factors-especially social disadvantage or the occurrence of other medical complications, as well as the characteristics of the disease itself (such as the extent to which it is associated with visible deficits or reduces the child's mobility)seem to aggravate the possibility of adverse psychological repercussions.'2 13 For those with leukaemia there is the additional 'risk factor' of their treatment regimens. Both radiotherapy and chemotherapy have been implicated as potential sources of damage to the developing central nervous system. Sometime after the introduction of this treatment protocol parents began to report difficulties for their children at school.'4 Typically, poor performance was noted especially in mathematics, problem solving, attention, and concentration skills. Moss and Nannis argued that central nervous system prophylaxis may be particularly damaging for young children, as compensatory mechanisms are less likely to operate when radiation treatment includes the whole brain. 5 They hypothesised that greater intellectual impairment would also occur in younger children who received radiation treatment before the brain was fully developed (below 5 years). Deficits could be expected to become more noticeable with time. This hypothesis is based on the assumption that new learning is more affected than previously acquired skills, and that generalised damage early in life has a profound effect on the individual child. Given parental reports of underachievement, and the possibility of radiation induced damage to the central nervous system, a considerable amount of research has been generated concerned with the short term and long term effects of treatment for leukaemia on the intelligence quotients (IQ) and academic achievements of children with the disease. I will now consider how adequately this research has been designed and carried out, what conclusions can be drawn, and what implications may be drawn for the education of these children.