C4d: a marker for hepatic transplant rejection.

Area of Science:

• Transplantation immunology
• Gastroenterology
• Pathology

Background:

• Acute rejection is a frequent complication following liver transplantation.
• Diagnosing rejection can be challenging with co-existing hepatitis C virus infection.
• C4d deposition in portal capillaries may differentiate rejection from hepatitis C recurrence.

Purpose of the Study:

• To investigate the utility of C4d deposition as a marker for hepatic allograft rejection.
• To determine if C4d presence aids in differentiating acute rejection from hepatitis C recurrence.

Main Methods:

• Retrospective analysis of 36 liver transplant biopsies from 34 patients.
• Biopsies were selected based on suspicion of rejection, hepatitis C recurrence, or routine follow-up.
• Immunohistochemical staining for C4d deposition in portal capillaries was performed.

Main Results:

• C4d expression was detected in 33% of acute rejection cases and 100% of chronic rejection cases.
• No C4d deposition was observed in recurrent hepatitis C infections without rejection.
• C4d presence correlated significantly with rejection status.

Conclusions:

• C4d deposition serves as a valuable marker for identifying acute and chronic rejection in liver allografts.
• C4d can aid clinicians in differentiating between liver transplant rejection and hepatitis C recurrence.
• These findings align with existing literature, reinforcing C4d's role in post-transplant liver assessment.