A diagnostic or prognostic assay is disclosed for a disease or condition characterised by abnormal methylation of cytosine at a site or sites within the glutathione-S-transferase (GST) Pi gene and/or its regulatory flanking sequences (e.g. prostate cancer and liver cancer). The assay comprises; (i) isolating DNA from said subject, and (ii) determining (e.g. by selective PCR amplification) the presence of abnormal methylation of cytosine at a site or sites within the GST-Pi gene and/or its regulatory flanking sequences.
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