Objective:

To assess the role of R-spondin 3 (RSPO3) in the immune landscape of gastric adenocarcinoma and its correlation with leukocyte infiltration and immune checkpoint signaling.

Approach:

• Patient Cohort and Tissue Microarray Preparation: Archival tissue from 277 chemotherapy-naïve gastric cancer patients was collected for analysis, focusing on tumor stages and patient characteristics.
• In Vivo Mouse Experiments: Conditional knockout and overexpression mouse models were utilized to study the effects of Rspo3 on gastric tissue in relation to H. pylori infection.
• H. pylori Infection: Mice were infected with H. pylori to evaluate the impact of RSPO3 on gastric carcinogenesis and immune response.
• Single-Molecule RNA In Situ Hybridization: RNA in situ hybridization was performed to detect RSPO3 expression in human and murine tissue samples.

Key Findings:

• RSPO3 levels correlate with leukocyte infiltration in gastric adenocarcinoma.
• RSPO3 enhances Wnt signaling, which may influence immune checkpoint pathways.
• Dysregulated Wnt signaling is observed in approximately 50% of human gastric cancers.

Interpretation:

The study suggests that RSPO3 may play a significant role in modulating the immune landscape of gastric adenocarcinoma, potentially affecting treatment responses.

Limitations:

• The study is retrospective and relies on archival tissue, which may limit the generalizability of findings.
• Animal models may not fully replicate human gastric cancer biology.

Conclusion:

RSPO3 is implicated in enhancing immunogenicity and adaptive immune resistance in gastric adenocarcinoma, warranting further investigation into its role as a potential biomarker.