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The most topical areas of oncological molecular diagnostics are reviewed with reference to DNA diagnostics for syndromes and malignancies known to be of hereditary predisposition. The data on some prognostically important tumor-specific markers are summarized. The possible implications of micrometastasis diagnosis are presented, and its essential role is shown. Some DNA polymorphisms predisposing to tumorigenesis are described. Consideration is given to a new aspect of carcinogenesis, epigenetic regulation of the genes involved in the malignant process. Highlighted is the need to develop these basically and practically important studies. Diagnostic protocols for various forms of malignancies are shown to practically result from the tumor cell genome studies. [ABSTRACT FROM AUTHOR]