This follow-up study enrolled chronic hepatitis C patients to evaluate the treatment efficacy and to identify post-treatment seromarkers associated with risk of hepatocellular carcinoma (HCC) among patients with a sustained virological response (SVR) or nonsustained virological response (NSVR). A total of 4639 patients who received pegylated interferon and ribavirin during 2004–2013 were followed until December 2014. HCC was confirmed through health examinations and data linkage with a national database. A total of 233 HCC cases were reported after 26,163 person-years of follow-up, indicating an incidence of 8.9 per 1000 person-years: 6.9 for SVR and 21.6 for NSVR per 1000 person-years. The associated risk of HCC in patients with SVR was 0.37 (0.22–0.63) for those without cirrhosis and 0.54 (0.31–0.92) for those with cirrhosis compared with their respective counterparts with NSVR. Among patients with SVR, advanced age, male gender, cirrhosis, decreased platelet count, and increased aspartate aminotransferase and α-fetoprotein levels were associated with HCC (p < 0.001). The treatment of chronic hepatitis C patients before they developed cirrhosis showed a higher efficacy than did the treatment of those who had already developed cirrhosis. Patients with SVR may still have a risk of HCC and need to be regularly monitored.
The World Health Organisation estimates that more than 185 million people (2.8%) have been infected with hepatitis C virus (HCV) globally1, and approximately 50–60% of these HCV-infected people live in the western Pacific and southeast Asian regions2. According to previous estimations, HCV infection accounts for more than 25% of the worldwide hepatocellular carcinoma (HCC) occurrence3. Individuals with chronic hepatitis C infection may have an increased risk of developing end-stage liver disease and extrahepatic diseases4, 5.
In recent years, a highly effective, short treatment course of orally administered direct-acting antiviral agents has been approved6, 7. However, these expensive drugs are not affordable for all HCV-infected patients and for citizens from countries with limited healthcare resources. In many countries, pegylated interferon (Peg-IFN) and ribavirin remain the first-line regimen for chronic hepatitis C patients. Successful treatment is defined as a sustained virological response (SVR), which is the absence of viremia for 24 weeks after the cessation of treatment. In Asian countries, most individuals carry the favourable IL28B genotype, resulting in a superior response to interferon-based therapy compared with that observed among other ethnic populations8. The duration of required clinical follow-up for patients who have achieved SVR is still unclear. Therefore, investigating the predictors for the development of HCC among patients who have achieved treatment-induced RNA clearance is critical for future clinical monitoring. The identification of HCC predictors among nonresponders and patients with SVR will be helpful when prioritising patients to receive intensive care.
Interferon-based treatment has been documented to reduce the risk of liver transplantation, liver failure, HCC, and liver-related mortality9,10,11,12,13. Compared with nonresponders, patients with SVR showed normalized seromarkers in laboratory tests14 and obvious beneficial effects14,15,16,17,18,19, with a 70% decrease in the development of end-stage liver disease18 and 54–75% decrease in all-cause mortality15, 16. However, most of these studies recruited highly selected patients with advanced fibrosis or cirrhosis13, 14, 16, 19. The treatment efficacy in noncirrhotic patients who are still in the early clinical stages has rarely been evaluated. Infected patients are often unaware of their infection and therefore do not seek clinical care and treatment because liver disease progresses slowly with few symptoms. Because large-scale screening has been advocated to identify patients with a high risk of HCV infection, evaluating the treatment efficacy may provide information for future cost-effective estimations.
This long-term follow-up study evaluated the treatment efficacy in patients who used the conventional Peg-IFN and ribavirin. Additionally, we examined clinical predictors for the risk of HCC among chronic hepatitis C patients who received interferon-based antiviral therapy.
We conducted a multicentre prospective study to investigate the HCC risk among chronic hepatitis C patients who received Peg-IFN and ribavirin. The study consisted of 4639 treatment-naive patients who received standard care in six medical centres located in northern, middle, and southern Taiwan during 2004–2014. All participants were aged 30 years or older; seropositive for HCV antibodies, with detectable HCV RNA; seronegative for hepatitis B surface antigen; seronegative for human immunodeficiency virus; and free of HCC at enrolment and during treatment. The patients included in this study were provided with appropriate and complete clinical information regarding the treatment regimen and duration. All the study participants provided informed consent. The study was conducted in accordance with the ethical principles stated in the Declaration of Helsinki and was approved by the Ethics Committee of the National Taiwan University Hospital, Kaohsiung Medical University Hospital, China Medical University Hospital, Chang Gung Memorial Hospital in Kaohsiung and Linkou, and Academia Sinica.
The patients infected with HCV genotype 1 or genotype non-1 received a combination of Peg-IFN and ribavirin therapy for 48 and 24 weeks, respectively. Serum HCV RNA test results at treatment initiation, end of treatment, and 24 weeks after the end of treatment were recorded. SVR was determined from the serum HCV RNA test results at 24 weeks after the end of treatment. Data regarding patient demographics (sex and birthdate), antiviral treatment (type of medication, treatment duration, and virological response), and presence of liver cirrhosis (ultrasonography or histological findings) were obtained. Virological data (HCV RNA levels and HCV genotype) and clinical laboratory findings, such as platelet count (109/L) and haemoglobin (g/dL), aspartate aminotransferase [AST] (U/L), alanine aminotransferase [ALT] (U/L), and α-fetoprotein (ng/mL) levels, at baseline and 24 weeks after the end of treatment were recorded. The fibrosis-4 score (FIB-4) was used as a surrogate to estimate the amount of scarring in the liver, and it was calculated from the patients’ age, serum ALT (U/L) and AST (U/L) levels, and platelet count (109/L)20. All clinical parameters were measured through standard laboratory techniques. Serum HCV RNA was measured by a commercialized sensitive assay with polymerase chain reaction using the COBAS TaqMan HCV test, v2.0 (Roche Diagnostics, Indianapolis, NJ, USA).
Ascertainment of HCC
At enrolment, none of the participants in this treatment cohort had been diagnosed with HCC. In this cohort, the patients received regular health examinations and monitoring during and after the end of antiviral treatment. The medical record verification of incident HCC diagnoses was based on the following criteria: histological examinations and the detection of a positive lesion through at least two different imaging techniques (abdominal ultrasonography, angiography, or computed tomography) or through one imaging technique accompanied with an elevated serum α-fetoprotein level of ≥400 ng/mL21. In addition to active follow-up, newly developed HCC cases from January 1, 2004 to December 31, 2014 were detected through computerised linkage with the profiles from the National Cancer Registration in Taiwan via matching of the participants’ identification number and birthdate. To ensure complete ascertainment, a linkage with the national death certification database was also performed to identify cases of HCC death. The ascertainment of newly developed HCC was complete and accurate4.
The baseline characteristic profiles of patients with SVR or non-sustained virological response (NSVR) at the time of treatment initiation were compared using chi-squared tests. In this prospective study, we estimated the incidence of HCC from treatment responses. For each patient, the person-years of follow-up were calculated from the date of treatment initiation to either the date of HCC identification, the date of death, or December 31, 2014, whichever came first. The incidence rates of HCC per 1,000 person-years were calculated by dividing the number of newly developed HCC cases by person-years of follow-up. Kaplan–Meier method curves were used to depict cumulative risks for HCC according to SVR or NSVR throughout the follow-up years, and these data were compared with log-rank tests.
The treatment efficacy was evaluated by comparing the incidence of HCC between patients with SVR or NSVR. Cox proportional hazards models were used to examine the magnitude of HCC risk reduction in patients with SVR. Several clinical predictors at treatment initiation, including liver cirrhosis, platelet count levels, α-fetoprotein levels, and haemoglobin concentration, were considered in multivariate models. Hazard ratios (HRs) with 95% confidence intervals (CIs) were used to assess the magnitude of the associations between risk predictors and HCC. Statistical significance levels were determined by a two-sided p value of 0.05. The proportionality assumption of Cox models was examined, and the assumption was not violated. To evaluate the relevant predictors associated with HCC risk after treatment, additional Cox’s proportional hazards models were performed by stratifying patients according to their SVR status. The clinical predictors identified at the time of determining the SVR status were used for subsequent analyses.
The dose–response relationship between platelet count and α-fetoprotein levels and the risk of HCC, after adjustment for other risk predictors, were examined for statistical significance, with a test for trends. All analyses were performed using the SAS statistical software package (version 9.1; SAS Institute Inc., Cary, NC, USA).
Baseline characteristics of SVR and NSVR patients
The clinical profiles of the 4639 patients at the initiation of antiviral treatment are shown in Table 1. A total of 3939 (85%) patients achieved SVR and 700 (15%) did not achieve SVR. Patients who achieved SVR tended to possess the following characteristics: younger age, male sex, HCV genotype non-1 infection, low HCV RNA levels at treatment, absence of cirrhosis, platelet count ≥100 103/μL, low α-fetoprotein levels, and lower proportions of fibrosis (FIB-4 ≥3.25; p < 0.05).
Incidence of HCC with SVR and NSVR
A total of 233 incident HCC cases were identified after a total of 26,163 person-years of follow-up, and the incidence of HCC was 8.9 per 1000 person-years. Table 2 shows the incident HCC cases, the observed person-years, and the rate of HCC per 1000 person-years, stratified according to the patients’ SVR status. Of the 3939 patients with SVR, 155 developed HCC after 22,548 person-years of follow-up, indicating an incidence rate of 6.9 per 1000 person-years. In addition, of 700 patients with NSVR, 78 developed HCC, indicating an incidence rate of HCC was 21.6 per 1000 person-years. Among both SVR and NSVR patients, those with liver cirrhosis at study entry had a higher HCC incidence than did those without liver cirrhosis (p < 0.01).
Cumulative risk of HCC with SVR and NSVR
The mean years of follow-up for the study patients was 5.6 years. The cumulative risk of HCC was 7.6% and 24.5% in patients with SVR and NSVR, respectively (p < 0.01; Fig. 1A). Patients with SVR had a decreased risk of HCC, irrespective of whether they had cirrhosis at study entry (p < 0.01). After follow-up, the cumulative risk of HCC was 20.1% for SVR and 45.6% for NSVR among cirrhotic patients and 5.1% for SVR and 15.5% for NSVR among non-cirrhotic patients.
Treatment efficacy stratified by cirrhosis status at study entry
Among the non-cirrhotic patients, patients with SVR had a crude HR of 0.34 (0.20–0.57, p < 0.01) for HCC compared with those with NSVR, suggesting a treatment efficacy of 66%. Among patients with cirrhosis at study entry, the efficacy was 48%. These findings suggested that treating patients before they developed cirrhosis led to higher treatment efficacy.
Pre-treatment seromarkers associated with HCC
Table 3 shows the relative risk of HCC, stratified by treatment response and other clinical predictors. In the univariate analysis, the development of HCC was associated with older age, elevated serum levels of AST and α-fetoprotein, low platelet count and haemoglobin levels, increased FIB-4, and the presence of liver cirrhosis (p < 0.01). After adjustment for the clinical predictors significantly associated with HCC at study entry, the adjusted HR (95% CI) was 0.44 (0.30–0.64) for patients with SVR compared with those with NSVR (p < 0.01). The associated risk of HCC in patients with SVR was 0.37 (0.22–0.63) for those without cirrhosis and 0.54 (0.31–0.92) for those with cirrhosis compared with their respective counterparts with NSVR.
Changes in seromarkers before and after treatment
A comparison of the seromarker levels before and after treatment showed significantly decreased (all p < 0.001) serum levels of ALT (mean ± SD = 131.0 ± 106.6 vs. 31.4 ± 34.1), AST (89.7 ± 64.2 vs. 31.9 ± 24.1), and α-fetoprotein (15.2 ± 46.4 vs. 5.4 ± 12.9). A total of 31.4% participants had FIB4 ≥ 3.25 before treatment, whereas 15.2% had FIB4 ≥ 3.25 after treatment (p < 0.001).
Post-treatment seromarkers associated with HCC
The clinical predictors at 6 months after treatment cessation and the associated risk of HCC are described in Table 4. Among patients who achieved SVR, advanced age, male sex, elevated post-treatment AST levels, cirrhosis, decreased post-treatment platelet count, and increased post-treatment α-fetoprotein levels were significantly associated with HCC (p < 0.05). Moreover, advanced age, elevated post-treatment AST levels, and low post-treatment platelet count increased the risk of HCC among patients with NSVR (p < 0.05).
In Taiwan, a national viral hepatitis treatment programme was launched since October 2003. The government started reimbursing patients with chronic hepatitis B or hepatitis C for antiviral therapy. The incidence and mortality of end-stage liver diseases continually decreased in all age and sex groups from 2000–2003 (before the treatment programme) through 2004–2007 to 2008–2011. Using 2000–2003 as a reference, the incidence and mortality of HCC were decreased by at least 14–24%22. The availability of large national claims data and long-term follow-up enabled researchers to evaluate relatively rare outcomes such as HCC with sufficient power. This database has been utilised to evaluate the antiviral treatment efficacy, with results showing that patients who had received antiviral treatment had a decreased risk of liver-related disease incidence or mortality22, 23. However, the SVR status of the treated patients and the predictors for the development of HCC were difficult to assess because of the lack of individualised data regarding clinical markers. Our study enrolled a large number of patients with long-term follow-up and collected detailed clinical information, which helped to identify relevant seromarkers that could be useful for monitoring patients after treatment.
Although the nationwide Veterans Affairs HCV Clinical Case Registry contains health information for all-known HCV-infected patients and collects laboratory test as well as pharmacy data in a large cohort to examine SVR efficacy and liver-related diseases after considering for potentials confounders, this population was overwhelmingly male; thus, the results may not apply to populations with large proportions of females15, 24. The epidemiological characteristics of HCV infection and treatment responses in western and eastern countries were different; thus, a large follow-up study to estimate the treatment efficacy is warranted before the widespread use of the highly expensive new drugs25. A recent study recruited veterans with HCV infection and reported that HCC may still occur among those with SVR, at an incidence of 3.3 per 1000 person-years24. Although our cohort had more female patients, the estimated incidence of HCC was 6.9 per 1000 person-years, which was still higher than that among the veterans. In the veteran cohort, 64% of the participants were white, and that study revealed ethnic differences in the occurrence of HCC, with Asians having an approximately three-fold higher risk of developing HCC than do whites24. Hepatitis B virus infection is endemic to Taiwan and other Asian countries. In our study, all participants showed seronegativity for the hepatitis B surface antigen. Although we did not test antibodies against the hepatitis B core antigen, most patients who had ever been infected by hepatitis B virus were presumably in their early childhood. Recent meta-analysis demonstrated that the risk of HCC among anti-HCV-seropositives was significantly higher among the subject positive for anti-HBc than the subjects negative for anti-HBc26. The risk of anti-HBc-positivity on HCC occurrence remained even after successful antiviral therapy27.
Patients with SVR still had a substantially increased risk of developing HCC. This study emphasised the importance of monitoring, even for patients that had treatment-induced RNA clearance28 and particularly for those with fibrosis (low platelet count) and elevated serum α-fetoprotein levels. Patients without SVR had increased risk for HCC. Thus it will be essential to intensively monitor the patients who were failed for interferon-based regimen and allocate them with direct-acting antivirals.
This long-term follow-up study suggested that among patients with SVR, elevated serum α-fetoprotein levels after antiviral treatment were significantly associated with HCC risk in a dose–response-dependent manner. Serum α-fetoprotein levels are frequently used as a biomarker for HCC, but their performance was not satisfactory. When 20 ng/mL was used as the cutoff value for HCC detection, the sensitivity was 41–65% and specificity was 80–94%29. Patients with chronic viral hepatitis and cirrhosis in the absence of HCC may still have elevated α-fetoprotein levels30. Among chronic hepatitis C patients with advanced fibrosis, hepatic injury or regeneration may increase the serum α-fetoprotein levels even in patients without HCC31, 32. Elevated serum α-fetoprotein levels were associated with a decreased platelet count and an increased ALT-to-AST ratio33. The findings of our study were consistent with those of a Japanese cohort study, which showed that post-treatment serum α-fetoprotein levels achieved 80% predictability in detecting HCC by setting the cutoff value at 6 ng/mL34. Similarly, a recent study revealed that patients with α-fetoprotein levels higher than 10 ng/mL had an approximately 7.8-fold higher risk of developing HCC after achieving SVR35.
Regardless of the SVR status among patients, the discovery of biomarkers that may increase the predictive ability to identify patients with a high risk of developing HCC remains crucial. A prospective study in Japan found a unique fibrosis-related glycomarker that may predict the development of HCC with sufficient diagnostic accuracy36. Serum gamma-glutamyl transferase levels, a surrogate of oxidative stress, were associated with a subsequent HCC risk among noncirrhotic patients after HCV eradication37. These seromarkers were not routinely used in clinical settings but could be viewed as potential biomarkers for HCC surveillance. Both positive and negative predictive values of these biomarkers in conjunction with abdominal ultrasonography for liver surveillance should be evaluated. In the future, large-scale follow-up studies will facilitate the discovery of more useful biomarkers for end-stage liver disease.
HCV 1b and 2a were the predominant HCV genotypes in Taiwan. Previous studies have shown that patients with genotype 1 had an SVR rate of 70–80%38,39,40, whereas genotype 2 had an SVR rate of 74–90%41, 42. Compared with SVR rate in Western countries, the high SVR rate in Taiwan was due to a higher proportion of HCV genotype non-1 (40–45%) in Taiwan and a very high proportion of favorable IL28B genotype distribution (more than 90%) in Taiwanese HCV patients. Approximately 80–90% of East Asian people carried the favourable IL28B genotype, and the polymorphisms contributed to the treatment-induced RNA clearance and RNA spontaneous clearance8, 43,44,45.
In addition to hepatic diseases, chronic HCV infection was found to cause extrahepatic diseases46,47,48. However, less than 15% of chronic hepatitis C patients seek clinical care; thus, the community effectiveness of treatment is approximately 7–11%49, 50. Our study suggested that early intervention had higher efficacy for reducing HCC risk in hepatitis C patients without liver cirrhosis than in those with cirrhosis. The establishment of health policies for identifying asymptomatic HCV-infected patients living in the community through large-scale screening and recommending these patients for clinical care will be critical issues in the future. In addition, to reduce the patient risk of both hepatic and extrahepatic diseases, an increase in the patient accessibility to new effective drugs is essential. With regard to public health, the goal of primary prevention should be to promote an increased awareness and knowledge of hepatitis C through effective health education.
In conclusion, our findings suggest that treating chronic hepatitis C patients before the development of advanced fibrosis may result in improved clinical efficacy for decreasing the risk of HCC. In addition, patients with SVR still require continuous surveillance for HCC.
Mohd Hanafiah, K., Groeger, J., Flaxman, A. D. & Wiersma, S. T. Global epidemiology of hepatitis C virus infection: new estimates of age-specific antibody to HCV seroprevalence. Hepatology 57, 1333–1342, doi:10.1002/hep.26141 (2013).
Nguyen, L. H. & Nguyen, M. H. Systematic review: Asian patients with chronic hepatitis C infection. Alimentary pharmacology & therapeutics 37, 921–936, doi:10.1111/apt.12300 (2013).
Perz, J. F., Armstrong, G. L., Farrington, L. A., Hutin, Y. J. & Bell, B. P. The contributions of hepatitis B virus and hepatitis C virus infections to cirrhosis and primary liver cancer worldwide. J Hepatol 45, 529–538, doi:10.1016/j.jhep.2006.05.013 (2006).
Lee, M. H. et al. Hepatitis C virus seromarkers and subsequent risk of hepatocellular carcinoma: long-term predictors from a community-based cohort study. J Clin Oncol 28, 4587–4593, doi:JCO.2010.29.1500 (2010).
Lee, M. H. et al. Chronic hepatitis C virus infection increases mortality from hepatic and extrahepatic diseases: a community-based long-term prospective study. J Infect Dis 206, 469–477, doi:10.1093/infdis/jis385 (2012).
Kohli, A., Shaffer, A., Sherman, A. & Kottilil, S. Treatment of hepatitis C: A systematic review. JAMA 312, 631–640, doi:10.1001/jama.2014.7085 (2014).
Kao, J. H. Hepatitis C virus infection in Taiwan: Past, present, and future. J Formos Med Assoc 115, 65–66, doi:10.1016/j.jfma.2015.06.012 (2016).
Ge, D. et al. Genetic variation in IL28B predicts hepatitis C treatment-induced viral clearance. Nature 461, 399–401, doi:10.1038/nature08309 (2009).
Singh, S., Singh, P. P., Roberts, L. R. & Sanchez, W. Chemopreventive strategies in hepatocellular carcinoma. Nat Rev Gastroenterol Hepatol 11, 45–54, doi:10.1038/nrgastro.2013.143 (2014).
Kimer, N., Dahl, E. K., Gluud, L. L. & Krag, A. Antiviral therapy for prevention of hepatocellular carcinoma in chronic hepatitis C: systematic review and meta-analysis of randomised controlled trials. BMJ open 2, e001313, doi:10.1136/bmjopen-2012-001313 (2012).
Nishiguchi, S. et al. Prevention of hepatocellular carcinoma in patients with chronic active hepatitis C and cirrhosis. Lancet 357, 196–197, doi:10.1016/S0140-6736(00)03595-9 (2001).
Yoshida, H. et al. Interferon therapy reduces the risk for hepatocellular carcinoma: National surveillance program of cirrhotic and noncirrhotic patients with chronic hepatitis C in Japan. Ann Intern Med 131, 174–181, doi:10.7326/0003-4819-131-3-199908030-00003 (1999).
Nishiguchi, S. et al. Randomized trial of effects of interferon-alpha on incidence of hepatocellular carcinoma in chronic active hepatitis C with cirrhosis. Lancet 346, 1051–1055, doi:10.1016/S0140-6736(95)91739-X (1995).
Morgan, T. R. et al. Outcome of sustained virological responders with histologically advanced chronic hepatitis C. Hepatology 52, 833–844, doi:10.1002/hep.23744 (2010).
Backus, L. I. et al. A sustained virologic response reduces risk of all-cause mortality in patients with hepatitis C. Clin Gastroenterol Hepatol 9, 509–516 e501, doi:10.1016/j.cgh.2011.03.004 (2011).
van der Meer, A. J. et al. Association between sustained virological response and all-cause mortality among patients with chronic hepatitis C and advanced hepatic fibrosis. JAMA 308, 2584–2593, doi:10.1001/jama.2012.144878 (2012).
Ogawa, E. et al. Efficacy of pegylated interferon alpha-2b and ribavirin treatment on the risk of hepatocellular carcinoma in patients with chronic hepatitis C: a prospective, multicenter study. J Hepatol 58, 495–501, doi:10.1016/j.jhep.2012.10.017 (2013).
Morgan, R. L. et al. Eradication of hepatitis C virus infection and the development of hepatocellular carcinoma: a meta-analysis of observational studies. Ann Intern Med 158, 329–337, doi:10.7326/0003-4819-158-5-201303050-00005 (2013).
Aleman, S. et al. A risk for hepatocellular carcinoma still persists long-term after sustained virological response in patients with hepatitis C associated liver cirrhosis. Clin Infect Dis 57, 230–236, doi:10.1093/cid/cit234 (2013).
Vallet-Pichard, A. et al. FIB-4: an inexpensive and accurate marker of fibrosis in HCV infection. comparison with liver biopsy and fibrotest. Hepatology 46, 32–36, doi:10.1002/hep.21669 (2007).
Bruix, J. & Sherman, M. American Association for the Study of Liver, D. Management of hepatocellular carcinoma: an update. Hepatology 53, 1020–1022, doi:10.1002/hep.24199 (2011).
Chiang, C. J. et al. Significant reduction in end-stage liver diseases burden through the national viral hepatitis therapy program in Taiwan. Hepatology 61, 1154–1162, doi:10.1002/hep.27630 (2015).
Hsu, C. S. et al. Interferon-based therapy decreases risks of hepatocellular carcinoma and complications of cirrhosis in chronic hepatitis C patients. PLoS One 8, e70458, doi:10.1371/journal.pone.0070458 (2013).
El-Serag, H. B., Kanwal, F., Richardson, P. & Kramer, J. Risk of Hepatocellular Carcinoma after Sustained Virologic Response in Veterans with HCV-infection. Hepatology 64, 130–7, doi:10.1002/hep.28535 (2016).
Hajarizadeh, B., Grebely, J. & Dore, G. J. Epidemiology and natural history of HCV infection. Nat Rev Gastroenterol Hepatol 10, 553–562, doi:10.1038/nrgastro.2013.107 (2013).
Coppola, N., Onorato, L., Sagnelli, C., Sagnelli, E. & Angelillo, I. F. Association between anti-HBc positivity and hepatocellular carcinoma in HBsAg-negative subjects with chronic liver disease: A meta-analysis. Medicine 95, e4311, doi:10.1097/md.0000000000004311 (2016).
Ikeda, K., Marusawa, H. & Osaki, Y. et al. Antibody to hepatitis b core antigen and risk for hepatitis c–related hepatocellular carcinoma: A prospective study. Annals of Internal Medicine 146, 649–656, doi:10.7326/0003-4819-146-9-200705010-00008 (2007).
Yu, M. L. et al. Time-degenerative factors and the risk of hepatocellular carcinoma after antiviral therapy among hepatic C virus patients: a model for prioritization of treatment. Clin Cancer Res 23, 1690–1697, doi:10.1158/1078-0432.CCR-16-0921 (2016).
Gupta, S., Bent, S. & Kohlwes, J. Test characteristics of alpha-fetoprotein for detecting hepatocellular carcinoma in patients with hepatitis C. A systematic review and critical analysis. Ann Intern Med 139, 46–50, doi:10.7326/0003-4819-139-1-200307010-00012 (2003).
Chu, C. W. et al. Clinical, virologic, and pathologic significance of elevated serum alpha-fetoprotein levels in patients with chronic hepatitis C. J Clin Gastroenterol 32, 240–244, doi:10.1097/00004836-200103000-00014 (2001).
Bayati, N., Silverman, A. L. & Gordon, S. C. Serum alpha-fetoprotein levels and liver histology in patients with chronic hepatitis C. Am J Gastroenterol 93, 2452–2456, doi:10.1111/j.1572-0241.1998.00703.x (1998).
Hu, K. Q. et al. Clinical Significance of Elevated Alpha-Fetoprotein (AFP) in Patients with Chronic Hepatitis C, but not Hepatocellular Carcinoma. Am J Gastroenterol 99, 860–865, doi:10.1111/j.1572-0241.2004.04152.x (2004).
Chen, T. M. et al. Predictors of alpha-fetoprotein elevation in patients with chronic hepatitis C, but not hepatocellular carcinoma, and its normalization after pegylated interferon alfa 2a-ribavirin combination therapy. Journal of gastroenterology and hepatology 22, 669–675, doi:10.1111/j.1440-1746.2007.04898.x (2007).
Asahina, Y. et al. Alpha-fetoprotein levels after interferon therapy and risk of hepatocarcinogenesis in chronic hepatitis C. Hepatology 58, 1253–1262, doi:10.1002/hep.26442 (2013).
Nagaoki, Y. et al. Development of hepatocellular carcinoma in patients with hepatitis C virus infection who achieved sustained virological response following interferon therapy: A large-scale, long-term cohort study. Journal of gastroenterology and hepatology 31, 1009–1015, doi:10.1111/jgh.13236 (2016).
Yamasaki, K. et al. Elevated serum levels of Wisteria floribunda agglutinin-positive human Mac-2 binding protein predict the development of hepatocellular carcinoma in hepatitis C patients. Hepatology 60, 1563–1570, doi:10.1002/hep.27305 (2014).
Huang, C. F. et al. Baseline gamma-glutamyl transferase levels strongly correlate with hepatocellular carcinoma development in non-cirrhotic patients with successful hepatitis C virus eradication. J Hepatol 61, 67–74, doi:10.1016/j.jhep.2014.02.022 (2014).
Lin, C. Y. et al. IL28B SNP rs12979860 is a critical predictor for on-treatment and sustained virologic response in patients with hepatitis C virus genotype-1 infection. PLoS One 6, e18322, doi:10.1371/journal.pone.0018322 (2011).
Yu, M. L. et al. Rapid virological response and treatment duration for chronic hepatitis C genotype 1 patients: a randomized trial. Hepatology 47, 1884–1893, doi:10.1002/hep.22319 (2008).
Liu, C. H. et al. Pegylated interferon-alpha-2a plus ribavirin for treatment-naive Asian patients with hepatitis C virus genotype 1 infection: a multicenter, randomized controlled trial. Clin Infect Dis 47, 1260–1269, doi:10.1086/592579 (2008).
Yu, M. L. et al. Role of interleukin-28B polymorphisms in the treatment of hepatitis C virus genotype 2 infection in Asian patients. Hepatology 53, 7–13, doi:10.1002/hep.23976 (2011).
Liu, C. H. et al. Peginterferon alfa-2a with or without low-dose ribavirin for treatment-naive patients with hepatitis C virus genotype 2 receiving haemodialysis: a randomised trial. Gut 64, 303–311, doi:10.1136/gutjnl-2014-307080 (2015).
Lee, M. H. et al. Polymorphisms near the IFNL3 Gene Associated with HCV RNA Spontaneous Clearance and Hepatocellular Carcinoma Risk. Sci Rep 5, 17030, doi:10.1038/srep17030 (2015).
Tanaka, Y. et al. Genome-wide association of IL28B with response to pegylated interferon-alpha and ribavirin therapy for chronic hepatitis C. Nature genetics 41, 1105–1109, doi:10.1038/ng.449 (2009).
Thomas, D. L. et al. Genetic variation in IL28B and spontaneous clearance of hepatitis C virus. Nature 461, 798–801, doi:10.1038/nature08463 (2009).
Lin, Y. J. et al. Chronic Hepatitis C Virus Infection and the Risk for Diabetes: A Community-Based Prospective Study. Liver International 37, 179–186, doi:10.1111/liv.13194 (2016).
Lee, M. H. et al. Hepatitis C virus infection and increased risk of cerebrovascular disease. Stroke 41, 2894–2900, doi:STROKEAHA.110.598136 (2010).
Su, T. H. et al. Hepatitis C viral infection increases the risk of lymphoid-neoplasms: A population-based cohort study. Hepatology 63, 721–730, doi:10.1002/hep.28387 (2016).
Kuo, Y. H. et al. Comparison Stratagems of Post-Screening Management of Anti-HCV-Positive Community Residents: Simple Notification, Active Referral, or Accessible Medical Care. PLoS One 10, e0126031, doi:10.1371/journal.pone.0126031 (2015).
Yu, M. L. et al. Huge gap between clinical efficacy and community effectiveness in the treatment of chronic hepatitis C: a nationwide survey in Taiwan. Medicine (Baltimore) 94, e690, doi:10.1097/MD.0000000000000690 (2015).
Supported by research grants from the Ministry of Science and Technology, Taipei, Taiwan (MOST 104-2628-B-010-001-MY3 and MOST 105-2628-B010-003); Bristol-Myers Squibb Co., USA. No funding bodies had any role in the study design, data collection and analysis, decision to publish, or manuscript preparation.
The authors declare that they have no competing interests.
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Hepatitis C virus cure with direct-acting antivirals: Clinical, economic, societal and patient value for China
World Journal of Hepatology (2019)
Hepatitis C virus cure with direct-acting antivirals: Clinical, economic, societal and patient value for China
World Journal of Hepatology (2019)
Current Medical Research and Opinion (2019)
Applied Sciences (2018)