In the last four decades there has been enormous progress in the treatment for childhood cancer; the present 5-year survival rate is estimated to be 80%. The increased population of cancer survivors gives us the possibility to assess life quality as well as the late effects of anticancer treatment. In multicentre studies, it has been shown that 60% of survivors have at least one late effect, and one third experience severe or lifethreatening sequelae. Survivors of childhood cancers are at risk of recurrence of primary malignancy, development of second cancer and chronic disease of the respiratory and cardiovascular system, which increase the mortality rate. Other late complications, such as diseases affecting kidneys, digestive system or bones, and hormonal and metabolic disturbances lead to deterioration of life quality. This report presents treatment-related factors that increase mortality of cancer survivors by contributing to the development of second cancers, cardiotoxicity or pulmonary complications. K Ke ey y w wo or rd ds s: : children, cancer survivors, late effects, second cancers, cardiotoxicity, lung toxicity, late mortality. The significant progress observed over the last 40 years in the diagnostics and treatment for cancer in children has caused an improvement in 5-year event-free survival (EFS) up to 80%. Before 1970, anticancer therapy involved mainly radiotherapy and surgery. Later, chemotherapy began to play a role. In subsequent years, the chemotherapy programmes were modified and so were the radiotherapy and surgery programmes. Both single-centre and multicentre studies on the health condition of long-term survivors of childhood cancer have focused on the causes of premature deaths of patients treated for cancer in childhood. Until 1970, the major cause of mortality was recurrence of primary tumour (over 70%). Research conducted in recent years has demonstrated the highest mortality rate among patients treated for CNS cancer (11-15%), leukaemia (12-14%) and bone tumours (10-16%), and the lowest for retinoblastoma (2-5%) and Wilms tumour (3-4%) [1].
EpidemiologyAs shown by epidemiological data, in the USA one out of 640 young adults aged 20-39 years is a long-term survivor of childhood cancer. Fairly representative groups of several or even tens of thousands of childhood cancer survivors have been observed since 1940 in the United States, Canada, Germany, Great Britain and Italy [2][3][4]. This allows for a multidirectional analysis of health condition, organ function and life quality of an increasing number of survivors, and promotes the changes in radiotherapy and chemotherapy techniques.The largest multidirectional investigations carried out in the United States as part of the Childhood Cancer Survivor Study (CCSS) in a group of over 20 thousand survivors indicate that more than 60% of them have a chronic disorder and 27.5% have a severe life-threatening disease [5]. Of the group of 20,483 patients diagnosed in the years 1970-1986, 2821 died. The most common cause of death was progression o...