Exploring the immune microenvironment in small bowel adenocarcinoma using digital image analysis

Area of Science:

• Oncology
• Immunology
• Cancer Biomarkers

Background:

• Small bowel adenocarcinoma (SBA) is a rare cancer with poor prognosis.
• Immune cell infiltration and programmed cell death ligand-1 (PD-L1) expression are linked to disease progression in SBA.

Purpose of the Study:

• To analyze immune cell and immune checkpoint biomarker expression in SBA patients.
• To assess the impact of these biomarkers on progression-free survival (PFS) and overall survival (OS).

Main Methods:

• Tissue microarray analysis of 25 FFPE SBA samples.
• Immunohistochemistry for CD3, CD4, CD8, CD68, PD-L1, ICOS, IDO1, and LAG3.
• Digital image analysis and Kaplan-Meier survival analysis.

Main Results:

• High CD3, CD4, and IDO1 expression correlated with improved PFS.
• High ICOS expression was significant for both PFS and OS.
• High PD-L1 and IDO1 expression in tumor cells significantly impacted OS and PFS.

Conclusions:

• Elevated immune cells and immune checkpoint proteins significantly affect SBA patient survival.
• Findings suggest potential for immunotherapeutic interventions in SBA management.