Spatial Heterogeneity of Immune Regulators Drives Dynamic Changes in Local Immune Responses, Affecting Disease Outcomes in Pancreatic Cancer

Author:

Karamitopoulou Eva1ORCID,Wenning Anna S.2ORCID,Acharjee Animesh3ORCID,Aeschbacher Pauline2ORCID,Marinoni Ilaria1ORCID,Zlobec Inti1ORCID,Gloor Beat2ORCID,Perren Aurel1ORCID

Affiliation:

1. Institute of Tissue Medicine and Pathology, University of Bern, Bern, Switzerland. 1

2. Department of Visceral Surgery, Insel University Hospital, University of Bern, Bern, Switzerland. 2

3. University of Birmingham College of Medical and Dental Sciences, Birmingham, United Kingdom. 3

Abstract

Abstract Purpose: Pancreatic ductal adenocarcinoma (PDAC) is considered a low-immunogenic (LI) tumor with a “cold” tumor microenvironment and is mostly unresponsive to immune checkpoint blockade therapies. In this study, we decipher the impact of intratumoral heterogeneity of immune determinants on antitumor responses. Experimental Design: We performed spatial proteomic and transcriptomic analyses and multiplex immunofluorescence on multiple tumor regions, including tumor center (TC) and invasive front (IF), from 220 patients with PDAC, classified according to their transcriptomic immune signaling into high-immunogenic PDAC (HI-PDAC, n = 54) and LI PDAC (LI-PDAC, n = 166). Spatial compartments (tumor: pancytokeratin+/CD45− and leukocytes: pancytokeratin−/CD45+) were defined by fluorescence imaging. Results: HI-PDAC exhibited higher densities of cytotoxic T lymphocytes with upregulation of T-cell priming–associated immune determinants, including CD40, ITGAM, glucocorticoid-induced TNF–related receptor, CXCL10, granzyme B, IFNG, and HLA-DR, which were significantly more prominent at the IF than at the TC. In contrast, LI-PDAC exhibited immune-evasive tumor microenvironments with downregulation of immune determinants and a negative gradient from TC to IF. Patients with HI-PDAC had significantly better outcomes but showed more frequently exhausted immune phenotypes. Conclusions: Our results indicate strategic differences in the regulation of immune determinants, leading to different levels of effectiveness of antitumor responses between HI and LI tumors and dynamic spatial changes, which affect the evolution of immune evasion and patient outcomes. This finding supports the coevolution of tumor and immune cells and may help define therapeutic vulnerabilities to improve antitumor immunity and harness the responsiveness to immune checkpoint inhibitors in patients with PDAC.

Funder

Insular Foundation, University of Bern

Publisher

American Association for Cancer Research (AACR)

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