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Hypermethylation of promoter CpG islands represents an alternative mechanism to inactivate tumor suppressor genes. This study was to detect promoter methylation status and mRNA expression levels of ARRDC3, ELP3, GATA5, and PAX6, and to explore the association between methylation and expression in invasive ductal carcinomas (IDCs) and matched normal tissues (MNTs) from breast cancer patients. Aberrant...