Abstract: Methods of detecting DNA from a cancerous cell comprising receiving measurements of DNA methylation in at least one genomic region are provided. Arrays comprising at least 10 methylation specific oligonucleotides, wherein the methylation specific oligonucleotides are each reverse complementary to a genomic region are also provided.

Abstract: Methods of determining the origin of cell free DNA (cfDNA) and for detecting death of a cell type or tissue in a subject by determining the origin of cfDNA in the subject are provided. Computer program products, computerized methods and computerized systems for doing same, as well as methods for constructing a methylome atlas, are also provided.

Abstract: A method of ascertaining the methylation status of a double-stranded, cell-free DNA molecule in a specimen is disclosed. The method comprises ascertaining the methylation status of at least two methylation sites of the same double-stranded cell-free DNA molecule, wherein said double-stranded, cell-free DNA molecule comprises a nucleotide sequence which comprises no more than 300 base pairs and is comprised in a sequence as set forth in any one of SEQ ID NOs: 2-117 or 121-177.