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Cancer research

Distinct Immunosuppressive Tumor Microenvironment in Gastric Cancer With Peritoneal Metastasis Identified

Strategic Insights

— 1 min read

Researchers at the Sungkyunkwan University School of Medicine in Seoul, South Korea, have conducted a study to comprehensively analyze the tumor immune microenvironment (TIME) in peritoneal metastases of gastric cancer. The study aimed to understand the tumor immune microenvironment in patients with gastric cancer and peritoneal metastasis, which is often resistant to immunotherapy.

Key Takeaways:

  • The study revealed that T cells in malignant ascites expressed higher levels of immune checkpoint receptors, and that CD8 T cells exhibited terminal exhaustion.
  • Multiplex ELISA showed that soluble immunosuppressive factors were elevated in malignant ascites.
  • Multiplex IHC showed lower CD4 and CD8 T cell densities in metastatic peritoneal tumors, which predominantly exhibited immunosuppressive TIME subtypes.
  • The study concluded that distinct peritoneal immunosuppressive TIMEs exist in patients with gastric cancer with peritoneal metastasis.
  • The research provides new insights into the tumor immune microenvironment in gastric cancer and has significant implications for the development of immunotherapy.
  • The study used paired single-cell suspensions from malignant ascites and peripheral blood mononuclear cells for multicolor fluorescence-activated cell sorting (FACS) analysis.
  • The researchers evaluated paired samples of primary gastric tumors and metastatic peritoneal tumors from 12 patients using multiplex immunohistochemistry (IHC).
  • Additional authors for this research include Hongsik Kim, Sun Kyung Lee, Seung-Myoung Son, Ok-Jun Lee, Soon Man Yoon, Hee Kyung Kim, Yaewon Yang, Ki Hyeong Lee, and Hye Sook Han.

Statistics:

  • 27 patients with gastric cancer were involved in the study.
  • 12 patients had paired samples of primary gastric tumors and metastatic peritoneal tumors analyzed using multiplex immunohistochemistry (IHC).
  • 15 patients with gastric cancer and 15 patients with liver cirrhosis were involved in the ELISA analysis.
  • The study found that CD8 T cells exhibited terminal exhaustion (EomesT-bet).

Sources:

  • Distinct Immunosuppressive Tumor Microenvironment in Gastric Cancer With Peritoneal Metastasis. Journal of Gastric Cancer, 2025;25(4):605-620. Published by Korean Gastric Cancer Assoc. Gwanghwamun Opcia Bldg 1616, 163 Sinmun-Ro 1-Ga, Jongno-Gu, Seoul, 110-999, South Korea.
  • Sungkyunkwan University School of Medicine, Seoul, South Korea.

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