Long-term cohort study of chronic hepatitis C according to interferon efficacy.

BACKGROUND AND AIM

We investigated the prognosis of patients with C-viral chronic liver disease (C-CLD) according to the efficacy of interferon (IFN) therapy in a long-term retrospective cohort study.

METHODS

Of 721 patients with C-CLD who underwent liver biopsy between January 1986 and December 2005, 577 were treated with IFN, and 221 of these patients achieved sustained virological response (SVR) with a follow-up period of 9.9 ± 5.3 years.

RESULTS

The annual rate of HCC development was 2.71%/year, 2.31%/year, and 0.24%/year in untreated, non-SVR, and SVR patients, respectively. Multivariate Cox proportional regression analysis showed that the risk of HCC development was significantly lower in SVR patients than in untreated or non-SVR patients; moreover, this risk was similar in non-SVR patients and untreated patients. The annual mortality rate in overall death was 3.19%/year, 1.98%/year, and 0.44%/year in untreated, non-SVR, and SVR patients, respectively. Multivariate Cox proportional hazards regression analysis showed that the SVR status reduced the risk ratio for overall death to 0.173, whereas the non-SVR status did not significantly reduce the risk ratio.

CONCLUSIONS

The risk ratio of overall death and HCC development was significantly reduced in SVR patients, whereas no significant reduction was found in non-SVR patients in a long-term cohort study.