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1 Department of Obstetrics and Gynecology, Innsbruck University Hospital,
2 Department of Biostatistics and Documentation, University of Innsbruck, Innsbruck, Austria
Changes in the status of DNA methylation are one of the most common molecular alterations in human neoplasia. Because it is possible to detect these epigenetic alterations in the bloodstream of patients, we investigated whether aberrant DNA methylation in patient pretherapeutic sera is of prognostic significance in breast cancer.
Using MethyLight, a high-throughput DNA methylation assay, we analyzed 39 genes in a gene evaluation set, consisting of 10 sera from metastasized patients, 26 patients with primary breast cancer, and 10 control patients. To determine the prognostic value of genes identified within the gene evaluation set, we finally analyzed pretreatment sera of 24 patients having had no adjuvant treatment (training set) to determine their prognostic value. An independent test set consisting of 62 patients was then used to test the validity of genes and combinations of genes, which in the training set were found to be good prognostic markers.
In the gene evaluation set we identified five genes (ESR1, APC, HSD17B4, HIC1, and RASSF1A). In the training set, patients with methylated serum DNA for RASSF1A and/or APC had the worst prognosis (P < 0.001). This finding was confirmed by analyzing serum samples from the independent test set (P = 0.007). When analyzing all 86 of the investigated patients, multivariate analysis showed methylated RASSF1A and/or APC serum DNA to be independently associated with poor outcome, with a relative risk for death of 5.7.
DNA methylation of particular genes in pretherapeutic sera of breast cancer patients, especially of RASSF1A/APC, is more powerful than standard prognostic parameters.
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