At the Emma Kinderziekenhuis/Academic Medical Center in Amsterdam, survivors of childhood cancer are screened annually or biennially for the occurrence of late treatment effects. The screening procedures are based on previously used treatment modalities. The data gathered at the outpatient clinic are registered in the database PLEKsys. Evaluation of the data concerning over 1000 cancer survivors screened since the start of the clinic once more illustrated the relation between cranial irradiation and the development of central endocrine abnormalities. Surprisingly, at least a proportion of the growth hormone (GH)-deficient cancer survivors were registered as not being on a replacement therapy regimen. The reasons for survivors not to be on replacement therapy are currently being evaluated. The late-effects outpatient clinic and the PLEKsys database provide a platform for additional research in fields including endocrinology, which should be aimed at improving the care for and the health status of the survivors of childhood cancer.