Germinal center reactions in tertiary lymphoid structures associate with neoantigen burden, humoral immunity and long-term survivorship in pancreatic cancer.

Publication Title

Oncoimmunology

Authors

Andrew J Gunderson, Earle A. Chiles Research Institute, Providence Portland Medical Center, Portland, OregonFollow
Venkatesh Rajamanickam, Earle A. Chiles Research Institute, Providence Portland Medical Center, Portland, ORFollow
Cynthia Bui, Earle A. Chiles Research Institute, Robert W. Franz Cancer Center, Providence Cancer Institute, Portland, Oregon, United States.Follow
Brady Bernard, Earle A. Chiles Research Institute, Robert W. Franz Cancer Center, Providence Cancer Institute, Portland, Oregon, United States.Follow
Joanna Pucilowska, Earle A. Chiles Research Institute, Providence Portland Medical Center, Portland, ORFollow
Carmen Ballesteros-Merino, Laboratory of Molecular and Tumor Immunology, Earle A. Chiles Research Institute, Robert W Franz Cancer Center, Providence Portland Medical Center, Portland, OR, USA.Follow
Mark Schmidt, Providence Cancer Institute, Portland, ORFollow
Kayla McCarty, Earle A. Chiles Research Institute, Robert W. Franz Cancer Center, Providence Cancer Institute, Portland, OR, United States of AmericaFollow
Michaela Philips, Earle A. Chiles Research Institute, Robert W. Franz Cancer Center, Providence Cancer Institute, Portland, Oregon, United States.
Brian D. Piening, Molecular Genomics Laboratory, Providence Portland Medical Center, Portland, OR; Earle A. Chiles Research Institute, Robert W. Franz Cancer Research Center, Providence Portland Cancer Center, Portland, OR.Follow
Christopher Dubay, Providence Cancer CenterFollow
Terry R Medler, Earle A. Chiles Research Institute, Providence Portland Medical CenterFollow
Phillipa Newell, Earle A. Chiles Research Institute, Robert W. Franz Cancer Center, Providence Cancer Institute, Portland, Oregon, United States.
Paul D Hansen, Providence Portland Medical Center, Portland, OR.Follow
Eric Tran, Earle A. Chiles Research Institute, Robert W. Franz Cancer Center, Providence Cancer Institute, Portland, Oregon, United States.Follow
Ephraim Tang, Earle A. Chiles Research Institute, Robert W. Franz Cancer Center, Providence Cancer Institute, Portland, Oregon, United States.
Carlo Bifulco, Earle A. Chiles Research Institute, Robert W. Franz Cancer Research Center, Providence Portland Medical Center, Portland, ORFollow
Marka R Crittenden, Earle A. Chiles Research Institute, Robert W. Franz Cancer Center, Providence Portland Medical Center, PortlandFollow
Michael J. Gough, Earle A. Chiles Research Institute, Robert W. Franz Cancer Center, Providence Portland Medical Center, PortlandFollow
Kristina H Young, Earle A. Chiles Research Institute, Robert W. Franz Cancer Center, Providence Cancer Institute, Portland, OR, United States of AmericaFollow

Document Type

Article

Publication Date

3-17-2021

Keywords

oregon; portland; chiles

Abstract

Pancreatic ductal adenocarcinoma (PDAC) has traditionally been thought of as an immunologically quiescent tumor type presumably because of a relatively low tumor mutational burden (TMB) and poor responses to checkpoint blockade therapy. However, many PDAC tumors exhibit T cell inflamed phenotypes. The presence of tertiary lymphoid structures (TLS) has recently been shown to be predictive of checkpoint blockade response in melanomas and sarcomas, and are prognostic for survival in PDAC. In order to more comprehensively understand tumor immunity in PDAC patients with TLS, we performed RNA-seq, single and multiplex IHC, flow cytometry and predictive genomic analysis on treatment naïve, PDAC surgical specimens. Forty-six percent of tumors contained distinct T and B cell aggregates reflective of "early-stage TLS" (ES-TLS), which correlated with longer overall and progression-free survival. These tumors had greater CD8+ T cell infiltration but were not defined by previously published TLS gene-expression signatures. ES-TLS+ tumors were enriched for IgG1 class-switched memory B cells and memory CD4+ T cells, suggesting durable immunological memory persisted in these patients. We also observed the presence of active germinal centers (mature-TLS) in 31% of tumors with lymphocyte clusters, whose patients had long-term survival (median 56 months). M-TLS-positive tumors had equivalent overall T cell infiltration to ES-TLS, but were enriched for activated CD4+ memory cells, naive B cells and NK cells. Finally, using a TCGA-PDAC dataset, ES-TLS+ tumors harbored a decreased TMB, but M-TLS with germinal centers expressed significantly more MHCI-restricted neoantigens as determined by an in silico neoantigen prediction method. Interestingly, M-TLS+ tumors also had evidence of increased rates of B cell somatic hypermutation, suggesting that germinal centers form in the presence of high-quality tumor neoantigens leading to increased humoral immunity that confers improved survival for PDAC patients. AbbreviationsTLS: tertiary lymphoid structures; GC: germinal center(s); PDAC: pancreatic ductal adenocarcinoma; RNA-seq: RNA sequencing; BCRseq: B cell receptor sequencing; HEV: high endothelial venule; PNAd: peripheral node addressin; TMB: tumor mutational burden; TCGA: the cancer genome atlas; PAAD: pancreatic adenocarcinoma; FFPE: formalin fixed paraffin embedded; TIME: tumor immune microenvironment.

Area of Special Interest

Cancer

Area of Special Interest

Digestive Health

Specialty/Research Institute

Earle A. Chiles Research Institute

Specialty/Research Institute

Gastroenterology

Specialty/Research Institute

Oncology

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