Apoptotic gene expression under influence of fludarabine and cladribine in chronic lymphocytic leukemia-microarray study

Background:A deep insight into gene expression profiling (GEP) is a key to understanding the background of disease. It can lead to identification of diagnostic and prognostic factors and then to a selection of the most appropriate therapy. The aim of this study was to evaluate differences in apoptotic gene expression in chronic lymphocytic leukemia (CLL) cells influenced by fludarabine (FA) or cladribine (2-CdA).Methods:GEP was performed in cells obtained from 10 untreated CLL patients and cultured in vitro with FA or 2-CdA. Ninety-three selected apoptotic genes were analyzed using 384 TaqMan® Low Density Arrays in pooled RNA.Results: Relevant results were found in a set of 27 genes, however, the most striking differences between FA and 2-CdA were observed in the following 5 genes: BAD, TNFRSF21, DAPK1, CARD 6 and CARD 9.Conclusion: We have found some differences in apoptotic gene expression between FA and 2-CdA. These findings give prominence to genes qualifying for further studies currently conducted in our Department.