American Association for Cancer Research
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Figure S6 from Early Immune Remodeling Steers Clinical Response to First-Line Chemoimmunotherapy in Advanced Gastric Cancer

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journal contribution
posted on 2024-05-01, 07:40 authored by Minae An, Arnav Mehta, Byung Hoon Min, You Jeong Heo, Samuel J. Wright, Milan Parikh, Lynn Bi, Hyuk Lee, Tae Jun Kim, Song-Yi Lee, Jeonghyeon Moon, Ryan J. Park, Matthew R. Strickland, Woong-Yang Park, Won Ki Kang, Kyoung-Mee Kim, Seung Tae Kim, Samuel J. Klempner, Jeeyun Lee

Figure S6. (A) UMAP embedding of single cell transcriptomes obtained from all samples in this trial. Labeled are canonical cell types separated by tumor v.s. normal tissue, and by timepoint. (B) Heatmap and (C) UMAP embeddings showing marker gene expression for broad cell types in (A). (D) Broad cell type composition per sample across tumor and normal tissue. (E) Cell type proportions from scSeq data by timepoint in tumor and normal tissue excluding HER2+ patients. (F) Cell type proportions from scSeq data by timepoint and TCGA classification excluding HER2+ patients.


Doris Duke Charitable Foundation (DDCF)

DeGregorio Family Foundation (DFF)

Stand Up To Cancer (SU2C)

Korea Health Industry Development Institute (KHIDI)

Sungkyunkwan University (SKKU)



Adding anti–programmed cell death protein 1 (anti–PD-1) to 5-fluorouracil (5-FU)/platinum improves survival in some advanced gastroesophageal adenocarcinomas (GEA). To understand the effects of chemotherapy and immunotherapy, we conducted a phase II first-line trial (n = 47) sequentially adding pembrolizumab to 5-FU/platinum in advanced GEA. Using serial biopsy of the primary tumor at baseline, after one cycle of 5-FU/platinum, and after the addition of pembrolizumab, we transcriptionally profiled 358,067 single cells to identify evolving multicellular tumor microenvironment (TME) networks. Chemotherapy induced early on-treatment multicellular hubs with tumor-reactive T-cell and M1-like macrophage interactions in slow progressors. Faster progression featured increased MUC5A and MSLN containing treatment resistance programs in tumor cells and M2-like macrophages with immunosuppressive stromal interactions. After pembrolizumab, we observed increased CD8 T-cell infiltration and development of an immunity hub involving tumor-reactive CXCL13 T-cell program and epithelial interferon-stimulated gene programs. Strategies to drive increases in antitumor immune hub formation could expand the portion of patients benefiting from anti–PD-1 approaches. The benefit of 5-FU/platinum with anti–PD-1 in first-line advanced gastric cancer is limited to patient subgroups. Using a trial with sequential anti–PD-1, we show coordinated induction of multicellular TME hubs informs the ability of anti–PD-1 to potentiate T cell–driven responses. Differential TME hub development highlights features that underlie clinical outcomes.This article is featured in Selected Articles from This Issue, p. 695