This research identifies a specific 3D morphogenetic blueprint called Metastatic Trabecular Morphogenesis (MTM) that is essential for breast cancer spread. By utilizing single-cell RNA sequencing and AI-supported 3D imaging, scientists discovered that aggressive cancer cells reactivate fetal developmental programs to build complex, branching lattices of epithelial cords. These MTM-high states are not unique to distant sites but actually pre-exist in primary tumors that are destined to metastasize, serving as a powerful prognostic indicator. The study pinpointed the ETV1/4/5 transcription factors as the master regulators driving this structural expansion. Ultimately, the researchers found that this growth pattern depends on FGF signaling, suggesting a specific therapeutic vulnerability that could be targeted to stop lethal cancer outgrowth.

References:

• Caire R, Bordo R, Zanconato F, et al. A 3D morphogenetic blueprint for metastatic outgrowth in breast cancer[J]. Cell, 2026.