A Methylation-Based Assay for the Detection of Prostate Cancer Cells

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Prostate Cancer is a major cause of death and morbidity among men in the western world. Little is understood of the early events that lead to the development of prostate cancer though recent evidence suggests that a modification of the DNA called methylation may be an early indictor of disease. Our current work has shown that a gene involved in the detoxification of the cell (called GST) is switched off in over 90% of prostate cancers by this DNA modification. We have studied the methylation pattern of the GST gene in prostate cancer and normal prostate tissue and found that the GST gene is modified exclusively in the cancer tissue . This important information has allowed us to design a test to specifically identify prostate cancer cells by assaying for GST modification . In this grant we plan to further optimise this test to ensure its sensitivity and reliability. In particular we plan to compare the effectiveness of our methylation-based test to the PSA and other tests currently used for the detection of prostate cancer. In addition we plan to identify other genes that also may be switched off specifically in prostate cancer by DNA methylation. This data will allow the development of new markers and approaches to stage the progression of prostate and possibly other cancers.