[Tumour markers in malignant diseases]

The authors define the concept of "tumour markers" that indicate the presence of malignant diseases and describe their various stages of development. In addition, they demonstrate the classification, selection and clinical application of these markers. The theoretical and practical aspects of their clinical use are also discussed in terms of national and international expectations. Shortcomings in the clinical use of tumour markers in Hungary are touched upon and recommendations are offered for tumour marker development in this country.