In addition to breast cancer [15, 16], promoter DNA hypermethylation of CDO1 gene has been reported to be highly specific to cancer cells [8], and exhibited prognostic relevance in specific cancers such as esophageal [17, 18], lung [19], colorectal [20], gallbladder [21], and kidney cancer [22]. This evidence concerns the gene CDO1 and breast carcinoma.