[Analysis of normal and methylated urinary nucleobases: a new criterion for diagnosis and follow-up of malignancies (author's transl)].

The qualitative and quantitative analysis by high performance liquid chromatography of the normal and modified nucleobases excreted in urine represents a new and versatile tool. Its use for the diagnosis of malignancies, deliminating infectious diseases, and for the follow-up of the effects of a cytostatic therapy is shown. This method offers a chance to introduce the analysis of a series of fragments of primary gene products into the routine of clinical biochemistry.