The second paper is now available online in PLOS ONE and describes how tumor cells incorporate into the endothelium prior to trans-endothelial migration. This leads to physical displacement of endothelial cells and removal of VE-cadherin from the cell-cell contacts. This process is in contrast to leukocytes, which transmigrate through a tiny pore in the endothelium and in normal conditions do not disrupt the endothelium. Congratulations to my co-first author, Susan Hamilla, and my Ph.D. advisor, Helim Aranda-Espinoza!