Abstract: The present invention relates to a reagent for prevention of time-dependent, induced expression in biological cells in a sample. It likewise relates to a method for this purpose and also to cell preparations treated in this manner, the reagent for prevention of time-dependence induced expression in biological cells in a sample ex vivo containing a formaldehyde donor.

Abstract: The invention relates to a diagnosis kit, a DNA chip, and to methods for diagnosing or supervising the treatment of testicular cancer, which are of greatest importance, in particular, within the scope of cancer prevention and post-treatment. The invention is essentially characterized in that the mRNA of testicular tumor markers is detected in a blood sample, whereby the tumor markers depict a tumor-associated gene expression. To this end, particularly ?-hCG, AFP, PLAP or GCAP come into question. The detection of the mRNA is carried out by reverse transcription in cDNA and by subsequently amplifying selected segments of the cDNA by means of polymerase chain reaction.