Acute cellular rejection grading scheme for human gastric allografts

Area of Science:

• Transplantation immunology
• Gastroenterology
• Pathology

Background:

• Acute cellular rejection (ACR) monitoring is crucial for multivisceral transplant survival.
• Established ACR criteria exist for liver and small bowel, but not for gastric allografts.
• Gastric ACR assessment requires a standardized, objective grading system.

Purpose of the Study:

• To develop and validate a comprehensive grading scheme for evaluating gastric allograft rejection.
• To establish an objective and reproducible method for assessing acute cellular rejection in gastric transplants.

Main Methods:

• Developed a grading scheme evaluating epithelial, lamina propria, and glandular changes in gastric biopsies.
• Cumulated individual scores to determine the final rejection grade (no rejection to severe).
• Retrospectively analyzed 70 gastric allograft biopsies from 20 multivisceral transplant patients (1995-2001).

Main Results:

• The scoring system demonstrated no significant interobserver variability, ensuring accurate ACR grade designation.
• Clinical symptoms and endoscopic findings were not specific indicators of gastric ACR.
• Observed independent occurrence and varying intensity of ACR between gastric and other transplanted organs.

Conclusions:

• The developed grading scheme is objective and reproducible for evaluating gastric transplant ACR.
• This system facilitates improved correlation between gastric ACR grade, clinical presentation, and interinstitutional uniformity.
• Standardized gastric ACR grading is essential for optimizing multivisceral transplant management.