Cancer becomes highly dangerous when it spreads from its original site to a different vital organ. These secondary tumors called metastases are what kill most patients. Despite hundreds of years of research, it is not understood why, where, and how cancer spreads to organs like the brain. Lawrence Livermore Lab scientist describes how they bring together cancer biology, 3D printing and material science, to understand and hopefully prevent metastases in the future. Series: "Lawrence Livermore National Lab Science on Saturday" [Health and Medicine] [Science] [Show ID: 34466]