Genomics is broadly defined as a discipline concerning the study of the genomes of organisms, however, technically, it can have many different forms depending on the molecular levels or aspects: variomics focuses on sequence or structural variations, epigenomics on DNA or histone modifications, cistromics on cis-elements for transcriptional regulation, transcriptomics on transcribed genomic regions, and interactomics on three-dimensional chromosomal interactions. In medical research, cancer has become the “model disease” to receive all the attention from the genomicists especially with the recent development of high throughput sequencing technologies. In 2007, The International Cancer Genome Consortium was launched to coordinate a few synergetic efforts studying over 25,000 cancer genomes at the genomic, epigenomic and transcriptomic levels.