Asynchronous Evolution of Epithelium and Stroma Differentiates Precursor Lesions from Pancreatic Cancer.

Asynchronous evolution of epithelial and stromal components distinguishes pancreatic cancer from precursor lesions, with stromal reprogramming being a key differentiator.

• Why it matters: Understanding how the tumor microenvironment changes during pancreatic cancer progression is crucial, as it influences disease development and potential interventions. The rarity of normal samples and the microscopic nature of PanINs have limited insights into this process.
• What they did: Using spatial technologies and donor organs, the study mapped PanIN progression, revealing that epithelial cells evolve continuously with cancer, while stromal cells, including myeloid, lymphocytes, and fibroblasts, undergo drastic geographical and molecular changes.
• The result: Findings suggest that the lack of stromal reprogramming may prevent PanINs from progressing to cancer, providing new avenues for early detection and therapeutic targeting of pancreatic carcinogenesis.