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DNA methylation status is considered to be a promising biomarker for cancer prediction, especially in the rapidly growing field of multi-cancer early detection (MCED). This is a breast cancer DNA methylation dataset downloaded from the National Cancer Institute's GDC data portal (https://portal.gdc.cancer.gov). This dataset consists of 844 instances of cancer and 372 instances of normal methylation status. The array in each file is the methylation beta value at each locus, and the IDs are in idx.txt.