1 min read · From 2018 · The diversity of genetic sequences within an individual tumor has been a bane to oncologists, making it difficult to know which mutations are important and should be targeted. To evolutionary biologist Jeffrey Townsend and coworkers from Yale School of Public Health and Yale School of Medicine, this diversity of sequences held valuable information. Through sequence analysis they found that metastases do not arise late in tumor development, as had been assumed previously. Rather they can arise randomly from a primary tumor. Townsend’s article will captivate readers curious about how looking at data through a new lens can yield clinically relevant results.