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Solid tumor growth depends on an intricate equilibrium of malignant cell states

Torborg, S. R.; Grbovic-Huezo, O.; Singhal, A.; Holm, M.; Wu, K.; Han, X.; Ho, Y.-J.; Haglund, C.; Mitchell, M. J.; Lowe, S. W.; Dow, L. E.; Pitter, K. L.; Sanchez-Rivera, F. J.; Levchenko, A.; Tammela, T.

2023-12-30 cancer biology
10.1101/2023.12.30.573100 bioRxiv
Show abstract

Control of cell identity and number is central to tissue function, yet principles governing organization of malignant cells in tumor tissues remain poorly understood. Using mathematical modeling and candidate-based analysis, we discover primary and metastatic pancreatic ductal adenocarcinoma (PDAC) organize in a stereotypic pattern whereby PDAC cells responding to WNT signals (WNT-R) neighbor WNT-secreting cancer cells (WNT-S). Leveraging lineage-tracing, we reveal the WNT-R state is transient and gives rise to the WNT-S state that is highly stable and committed to organizing malignant tissue. We further show that a subset of WNT-S cells expressing the Notch ligand DLL1 form a functional niche for WNT-R cells. Genetic inactivation of WNT secretion or Notch pathway components, or cytoablation of the WNT-S state disrupts PDAC tissue organization, suppressing tumor growth and metastasis. This work indicates PDAC growth depends on an intricately controlled equilibrium of functionally distinct cancer cell states, uncovering a fundamental principle governing solid tumor growth and revealing new opportunities for therapeutic intervention.

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