Scientists have built a miniature human body-on-a-chip that lets them watch, in real time, one of cancer’s deadliest tricks: preparing distant organs for invasion before tumor cells ever arrive.
Researchers at Columbia University, led by Gordana Vunjak-Novakovic, connected millimeter-sized engineered human bone and lung tissues — grown from induced pluripotent stem cells (iPSCs) — through a vascular circulation channel. When breast cancer cells were introduced into the flow, they showed organ-specific colonization patterns matching human metastasis, gravitating toward bone or lung with distinct tissue-damage signatures. The work appeared in Science Translational Medicine.
The “pre-metastatic niche”
The chip captured how cancer cells condition an organ before colonizing it — a process called pre-metastatic niche formation. A selectively permeable barrier of endothelial cells separated the tissues from the blood channel, letting researchers observe cancer cells adhere to, cross, and settle into tissue. “Cancer is very smart, unfortunately. We learned how the cells cross barriers to get from blood circulation into the tissues,” Vunjak-Novakovic said.
Why it matters
Metastasis — not the original tumor — causes most cancer deaths, yet it is hard to study in living patients. A human-cell platform that reproduces organ-specific spread could help researchers test how to interrupt it, and screen drugs, without relying solely on animal models.