Histological changes in HCV antibody-positive, HCV RNA-negative subjects suggest persistent virus infection

Abstract

It is unclear whether hepatitis C virus (HCV) has been eradicated or persists at a low level in HCV antibody - positive HCV RNA - negative individuals. The natural history and liver histology are not well characterized. One hundred seventy-two HCV antibody - positive, serum HCV RNA - negative patients underwent diagnostic liver biopsy between 1992 and 2000 and were followed a median 7 years (range, 5-12). Patients with any possible cause of liver injury other than HCV were excluded. A single histopathologist scored sections using Ishak criteria. Characterization of the inflammatory infiltrate in selected cases used a novel semiquantitative technique and compared with HCV RNA - positive patients and healthy controls. One hundred two patients were excluded because of a risk factor for liver injury other than HCV. Seventy patients met the study criteria; four (5.7%) became HCV RNA - positive during follow-up. Sixty-six cases remained HCV RNA - negative; five (7.5%) had a normal liver biopsy; 54 (82%) had fibrosis (stage 2 or 3 in 16 (24%)). Nonviremic cases revealed expanded portal tracts (P < 0.05), with fewer CD4+ (P < 0.05) and more CD8+ cells (P < 0.05) than healthy controls, but were indistinguishable from HCV RNA - positive cases for these parameters. Lobular CD4 staining, absent in healthy controls, was noted in both HCV RNA - negative and -positive cases and was more marked in the latter (P < 0.05) with a sinusoidal lining cell distribution. Conclusion: Nonviremic HCV antibody - positive patients have a liver biopsy that is usually abnormal. Fibrosis was present in most with similar inflammatory infiltrate to viremic cases. The presence of a CD8+ rich inflammatory infiltrate suggests an ongoing immune response in the liver, supporting the view that HCV may persist in the liver in the majority of HCV RNA - negative cases. Copyright © 2008 by the American Association for the Study of Liver Diseases.