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Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
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The gallbladder is a small, pear-shaped organ that plays a crucial role in our digestive system. Measuring about 10 cm in length, it is comparable in size to a kiwi fruit and is located in a hollow area on the lower surface of the liver. The gallbladder's primary function is to store and concentrate bile, a fluid produced by the liver that aids in digestion.
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Immune Microenvironment in Gallbladder Adenocarcinomas.

Pallavi A Patil1,2, Kara Lombardo3, Weibiao Cao4

  • 1Departments of Pathology.

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|March 12, 2021
PubMed
Summary
This summary is machine-generated.

Programmed death-1 (PD1) and PD-ligand 1 (PD-L1) are highly expressed in gallbladder cancer. PD1+ tumor-infiltrating lymphocytes (TILs) correlate with tumor size and T cell infiltration, impacting survival differently based on tumor size, suggesting potential for immunotherapy.

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Area of Science:

  • Immunology
  • Oncology
  • Gastroenterology

Background:

  • Programmed death-1 (PD1) expression has not been previously reported in gallbladder adenocarcinoma.
  • Understanding PD1 and its ligand (PD-L1) expression is crucial for exploring novel therapeutic strategies in gallbladder cancer.

Purpose of the Study:

  • To investigate PD1 expression in gallbladder adenocarcinoma.
  • To correlate PD1 expression with clinicopathologic parameters and patient survival.
  • To explore the potential of PD1/PD-L1 checkpoint blockade as an immunotherapy for gallbladder cancer.

Main Methods:

  • Examined PD1 expression in 47 gallbladder cancer cases.
  • Assessed programmed death-ligand 1 (PD-L1) expression and PD1+ tumor-infiltrating lymphocytes (TILs).
  • Correlated PD1 expression with clinicopathologic parameters and analyzed survival outcomes using multivariate analysis.

Main Results:

  • High expression of PD-L1 (98%) and PD1+ TILs (78.7%) were observed in gallbladder adenocarcinomas.
  • PD1+ TILs were associated with smaller tumor size and higher stromal CD3+ TILs.
  • In small tumors (<3 cm), high CD3+ or CD8+ TILs correlated with better survival; in large tumors (≥3 cm), PD1+ TILs or high CD8+ TILs indicated poorer survival.

Conclusions:

  • Gallbladder adenocarcinomas exhibit high PD-L1 expression and PD1+ TILs, suggesting immune evasion mechanisms.
  • The prognostic significance of PD1+ TILs and CD8+ TILs varies with tumor size, highlighting a complex tumor-immune microenvironment.
  • These findings imply that immune-based therapies, such as PD1/PD-L1 checkpoint blockade, may offer therapeutic benefits for gallbladder adenocarcinomas.