Investigators from The Cancer Genome Atlas (TCGA) Research Network, including several scientists from the Broad Institute, have published the most comprehensive genomic analysis of endometrial cancer to date. Their study, which appeared in the May 2 issue of Nature, classified the tumors into four novel sub-types and identified molecular similarities between some of these sub-types and other forms of cancer, including ovarian, breast, and colorectal cancers. The findings provide new clues about the molecular pathways that may contribute to the disease, and could help identify which patients might benefit from aggressive treatment.