Immune infiltrating cells in duodenal cancers

Area of Science:

• Oncology
• Immunology
• Gastroenterology

Background:

• Duodenal adenocarcinoma (DA) is a rare, aggressive cancer with increasing incidence.
• Understanding DA pathogenesis and biology is limited by its rarity, hindering targeted therapies.
• Immune cell relevance in solid tumors is established, correlating with prognosis.

Purpose of the Study:

• To analyze the immune contexture in surgically resected duodenal adenocarcinomas.
• To correlate immune cell infiltration with clinical and histopathological variables.

Main Methods:

• Immunohistochemical staining of tumor specimens from 15 DA and 3 adenomas.
• Quantification of immune markers (CD45RO, CD8, CD20, IL-17, PD-1, CD68) using computer-assisted image analysis.
• Collection of demographic, clinical, and histopathological data.

Main Results:

• CD8+ T cell density inversely correlated with lymph node ratio and metastatic lymph node count.
• Lower CD8+ T cell density was observed in patients with recurrence and disease-related death.
• Distinct CD68+ macrophage distribution was noted between patients with and without recurrence.

Conclusions:

• Immune cell infiltration, especially T cells, may protect against lymphatic spread and nodal metastasis in DA.
• T cell density and macrophage infiltration are associated with a reduced risk of recurrence and disease-related death.
• Multicentric studies are recommended to validate these findings in larger cohorts.