Spatial mapping of transcriptomic plasticity in metastatic pancreatic cancer

Date:	June 2025
PMID:	40269162
Category:	N/A
Authors:	Guangsheng Pei, Jimin Min, Kimal I Rajapakshe, Vittorio Branchi, Yunhe Liu, Benson Chellakkan Selvanesan, Fredrik Thege, Dorsay Sadeghian, Daiwei Zhang, Kyung Serk Cho, Yanshuo Chu, Enyu Dai, Guangchun Han, Mingyao Li, Cassian Yee, Kazuki Takahashi, Bharti Garg, Herve Tiriac, Vincent Bernard, Alexander Semaan, Jean L Grem, Thomas C Caffrey, Jared K Burks, Andrew M Lowy, Andrew J Aguirre, Paul M Grandgenett, Michael A Hollingsworth, Paola A Guerrero, Linghua Wang, Anirban Maitra
Abstract:	40269162

Patients with treatment-refractory pancreatic cancer often succumb to systemic metastases1-3; however, the transcriptomic heterogeneity that underlies therapeutic recalcitrance remains understudied, particularly in a spatial context. Here we construct high-resolution maps of lineage states, clonal architecture and the tumour microenvironment (TME) using spatially resolved transcriptomics from 55 samples of primary tumour and metastases (liver, lung and peritoneum) collected from rapid autopsies of 13 people. We observe discernible transcriptomic shifts in cancer-cell lineage states as tumours transition from primary sites to organ-specific metastases, with the most pronounced intra-patient distinctions between liver and lung. Phylogenetic trees constructed from inferred copy number variations in primary and metastatic loci in each patient highlight diverse patient-specific evolutionary trajectories and clonal dissemination. We show that multiple tumour lineage states co-exist in each tissue, including concurrent metastatic foci in the same organ. Agnostic to tissue site, lineage states correlate with distinct TME features, such as the spatial proximity of TGFB1-expressing myofibroblastic cancer-associated fibroblasts (myCAFs) to aggressive 'basal-like' cancer cells, but not to cells in the 'classical' or 'intermediate' states. These findings were validated through orthogonal and cross-species analyses using mouse tissues and patient-derived organoids. Notably, basal-like cancer cells aligned with myCAFs correlate with plasma-cell exclusion from the tumour milieu, and neighbouring cell analyses suggest that CXCR4-CXCL12 signalling is the underlying basis for observed immune exclusion. Collectively, our findings underscore the profound transcriptomic heterogeneity and microenvironmental dynamics that characterize treatment-refractory pancreatic cancer.

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Acknowledgements:

The content of this article is solely the responsibility of the authors and does not necessarily represent the official views of the National Cancer Institute, or the National Institute of Health.

The Translational and Basic Science Research in Early Lesions (TBEL) Research Consortia is supported and funded by grants from the National Cancer Institute and the National Institutes of Health under the following award numbers:

Project Number:	Awardee Organization
U54CA274374	Fred Hutchinson Cancer Center
U54CA274375	Houston Methodist Research Institute
U54CA274370	Johns Hopkins University
U54CA274371	UT MD Anderson Cancer Center
U54CA274367	Vanderbilt University Medical Center