Hepatocellular carcinoma and direct acting antiviral treatments: Controversy after the revolution

Changes in the presentation and characteristics OF HCV related hepatocellular carcinoma in the era of direct acting antiviral therapy: A retrospective study

BACKGROUND

Hepatocellular carcinoma (HCC) is the sixth common malignancy worldwide. In Egypt, the main cause of HCC is hepatitis C virus (HCV)-related cirrhosis. After the successful mass treatment program of HCV in 2018 with direct-acting antivirals (DAAs) therapy, a large percentage of patients have been treated and effectively achieved sustained virological response (SVR). Recently, some studies claimed that HCCs that developed after treatment with DAAs have more aggressive behavior. Purpose of the study is to detect the possible change of HCC pattern before and after DAAs era and its effect on overall survival (OS).

METHODS

428 naïve HCC patients were divided into 2 groups: Group I HCC patients not treated with DAAs and Group II HCC patients treated with DAAs. Then we compared demographic, clinical, radiological, and laboratory characteristics between both groups.

RESULTS

Group II had improved liver function tests, including serum bilirubin, albumin, and international normalized ratio, than Group I (p < 0.001, p < 0.001, p < 0.001, respectively). They had a lower level of liver aminotransferases. Group II showed a larger infiltrative pattern of HCC, with a high incidence of portal vein thrombosis (p = 0.003, p < 0.001, p = 0.048, respectively). Group II received more curative or palliative treatment options, while 55 % of Group I received the best supportive care. There was no significant difference in 1-year and 2-years OS between both group, except that group II patients had better 2-year OS in subgroup BCLC stage C.

CONCLUSION

The tumor pattern has changed into a more aggressive phenotype after DAAs. DAAs have succeeded in preserving the liver condition. However, they did not demonstrate any protective effect on the OS of the patients. There is a strong need for strict screening program for early detection of HCC in the early stages, that are eligible for curative options, after HCV treatment of DAAs.

Impact of viral eradication by direct-acting antivirals on clinical outcomes after curative treatment for hepatitis C virus-associated hepatocellular carcinoma

Background

It is not clear that antiviral therapy for hepatitis C virus (HCV) after recovery from curative treatment for hepatocellular carcinoma (HCC) has an effect on suppressing recurrence or improving survival rates.

Objectives

We analyzed the impact of eradication by interferon (IFN)-free direct-acting antiviral (DAA) therapy on clinical outcomes of patients with HCV-associated HCC who underwent curative treatment.

Design

This was a retrospective study.

Methods

We retrospectively reviewed 109 consecutive patients with sustained virologic response with DAA therapy after HCC treatment and analyzed HCC recurrence and overall survival (OS). Among these patients are those with a history of HCC recurrence and curative HCC treatments administered as definitive HCC treatments prior to initiation of DAA therapy.

Results

Among 109 patients, 64 received DAA therapy after curative treatment for HCC; the remaining 45 received ⩾2 subsequent treatments for HCC. Cumulative HCC recurrence rates at 1, 3, and 5 years were 23%, 47%, and 56%, respectively. Multivariate analysis identified predictive factors for suppression of HCC recurrence as tumor number (hazard ratio (HR) 2.293 for multiple; p = 0.006) and number of HCC treatments before DAA therapy (HR 2.928 for ⩾2; p = 0.001). Among 64 patients who received curative treatment for HCC, cumulative first HCC recurrence rates at 1, 3, and 5 years were 12%, 34%, and 44%, respectively, second recurrence rates were 11%, 28%, and 39%, and third recurrence rates were 0%, 22%, and 53%, respectively; recurrence tended to be suppressed until 3 years. Cumulative OS rates at 3 and 5 years were 87% and 75%, respectively. On multivariate analysis, tumor number (HR 2.452 for single; p = 0.026) was the only independent predictor of OS.

Conclusion

DAA therapy after curative treatment for HCC suppresses HCC recurrence in the long term, but recurrence was higher in patients with a history of many HCC treatments.

Evaluation of patients treated with direct-acting anti-viral therapy for chronic hepatitis C and their risk of hepatocellular carcinoma in Hong Kong

BACKGROUND & AIM

To evaluate the risk of early hepatocellular carcinoma (HCC) in chronic hepatitis C patients treated with direct-acting antivirals (DAAs) in Hong Kong, as it has not been studied before in this locality.

METHODS

Three hundred thirty-three consecutive chronic hepatitis C patients treated with DAAs from two hospitals over the past 6 years were identified. Kaplan-Meier method was used to calculate cumulative HCC incidence. Cox regression was used to identify factors associated with HCC development.

RESULTS

During a median follow-up of 23.4 months after DAA started, 15 (5.4%, 95% CI 3.3-8.7%) out of 279 total included patients developed HCC. The overall sustained virological response (SVR) rate was 98.9%. The 1-year cumulative incidence for de-novo HCC and HCC recurrence were 0.8 and 30.9%, respectively (log-rank test p < 0.001). The 1-year cumulative HCC incidence for patients without and with cirrhosis were 0.7 and 5.1%, respectively (log-rank test p = 0.036). Univariate analysis showed that significant factors associated with HCC after DAA were: history of treated HCC, cirrhosis, evidence of portal hypertension, higher AFP at the start or end of DAA therapy, higher bilirubin, lower platelets, lower albumin, and older age. From receiver operating characteristic curve analysis, the optimal cut-off level of AFP for predicting HCC was 10.5 ng/mL at the start and 5.6 ng/mL at the end of DAA therapy.

CONCLUSIONS

The risk of early HCC recurrence remains high despite achieving SVR following DAA therapy, whereas the risk of early de-novo HCC occurence is low. AFP levels, both at the start and end of DAA therapy, can be useful in stratifying risks of HCC development.

Controversies of Direct-Acting Antivirals in Hepatocellular Carcinoma

Therapy for chronic hepatitis C virus infection with direct-acting antiviral agents (DAAs) has been highly successful in achieving sustained virological response (SVR) with associated improvements in liver dysfunction, liver-related mortality, and transplant-free survival. There is a high risk of hepatocellular carcinoma (HCC) with an annual incidence of 2% to 4% in patients with cirrhosis. Following DAAs treatment and achievement of SVR, the risk of incident and recurrent HCC drops significantly over time, with risk associated with demographic and liver disease-related factors. Several risk factors have been described including age, male, diabetes comorbidities, alcohol abuse, hepatitis B virus or human immunodeficiency virus-coinfection, and advanced liver disease or increased liver fibrosis. Recurrence risk after DAA therapy has been associated with baseline tumor burden, with increased risk with larger lesion(s), multifocal disease, elevated alpha-fetoprotein level, treatment type (curative vs palliative), and shorter interval between HCC complete response and DAA initiation. Overall, due to the heterogeneity among individual patient data and lack of adequately controlled data, there are no conclusive statements that can be drawn that DAAs exposure is directly associated with HCC occurrence or recurrence. However, the best available data suggest a decreased risk of incident HCC with DAA therapy and no increased risk of recurrence with DAAs after complete tumor response.

Genetic Susceptibility to Hepatocellular Carcinoma in Patients with Chronic Hepatitis Virus Infection

Hepatocellular carcinoma (HCC) is one of the leading causes of cancer-related deaths globally. The risk factors for HCC include chronic hepatitis B and C virus infections, excessive alcohol consumption, obesity, metabolic disease, and aflatoxin exposure. In addition to these viral and environmental risk factors, individual genetic predisposition is a major determinant of HCC risk. Familial clustering of HCC has been observed, and a hereditary factor likely contributes to the risk of HCC development. The familial aggregation may depend on a shared environment and genetic background as well as the interactions of environmental and genetic factors. Genome-wide association studies (GWASs) are one of the most practical tools for mapping the patterns of inheritance for the most common form of genomic variation, single nucleotide polymorphisms. This approach is practical for investigating genetic variants across the human genome, which is affected by thousands of common genetic variants that do not follow Mendelian inheritance. This review article summarizes the academic knowledge of GWAS-identified genetic loci and their association with HCC. We summarize the GWASs in accordance with various chronic hepatitis virus infection statuses. This genetic profiling could be used to identify candidate biomarkers to refine HCC screening and management by enabling individual risk-based personalization and stratification. A more comprehensive understanding of the genetic mechanisms underlying individual predisposition to HCC may lead to improvements in the prevention and early diagnosis of HCC and the development of effective treatment strategies.

Risk factors for developing hepatocellular carcinoma in patients treated with direct-acting antivirals

INTRODUCTION AND AIM

Chronic hepatitis C is one of the main causes of cirrhosis of the liver. Treatment with direct-acting antivirals (DAAs) improves survival. There is controversy as to whether AADs create an increased risk for the development of hepatocellular carcinoma (HCC). The aim of the present study was to determine the risk factors for developing HCC in patients with chronic hepatitis C treated with DAAs.

MATERIALS AND METHODS

A cohort study was conducted, within the time frame of June 2017 and June 2018, on patients >18 years of age, with chronic hepatitis C, genotypes 1 and 4, with one year of follow-up, to evaluate the presence of HCC.

RESULTS

We analyzed 108 patients, 71 (65%) of whom were women. Mean patient age was 56.24 years (±10.6), 1b was the most frequent genotype (63%), and 49% of the patients received treatment with DAAs (ombitasvir/paritaprevir/ritonavir plus dasabuvir). Thirty-four (31%) patients were obese. Fifty-three percent (58) had cirrhosis and 82% (89) had Child-Pugh class A liver function. Sustained virologic response at 12 weeks was 100%. Eight (7%) patients developed HCC and 1b was the most frequently associated genotype (87%). The presence of regenerative nodules >10 mm (P < .05), esophageal varices (P < .05), cirrhosis of the liver (P < .05), Child-Pugh B-C (P < .05), and alpha-fetoprotein >20 IU/mL (P = 0.20) one year after treatment were associated with the development of HCC.

CONCLUSIONS

The risk factors for developing HCC were the presence of cirrhosis of the liver, Child-Pugh class B liver function, esophageal and/or gastric varices, and genotype 1b.

Two distinct Notch signals, Delta-like 4/Notch1 and Jagged-1/Notch2, antagonistically regulate chemical hepatocarcinogenesis in mice

Notch signaling is one of the most common drivers of carcinogenesis in many types of cancers, including hepatocellular carcinoma (HCC); however, it occasionally suppresses tumor progression. Moreover, it is virtually unknown how different sets of Notch ligands and receptors regulate the HCC development. In this study, we demonstrate that the expression of the Notch ligands, Delta-like 4 (Dll4) and Jagged-1 (Jag1), is upregulated during diethylnitrosamine-induced hepatocarcinogenesis. Dll4 is detected in the preneoplastic hepatocytes and HCC cells, but not in the normal hepatocytes, while Jag1 is expressed in the desmin-positive mesenchymal cells. Hepatocyte-specific Dll4 knockout abolishes the Notch1 signaling and suppresses the tumor progression. In contrast, Jag1 deletion induces the ectopic expression of Dll4 in hepatocytes along with the loss of Notch2 signaling, leading to the tumor progression. These results indicate that the two distinct Notch signals, Dll4/Notch1 and Jag1/Notch2, are antagonistic to each other, exerting opposite effects on HCC progression.

Dll4/Notch1 signal promotes the progression of HCC, while Jag1/Notch2 signal antagonistically suppresses it in murine chemical hepatocarcinogenesis. Nakano et al. report that two distinct Notch signals regulate the progression of hepatocellular carcinoma (HCC) using tissue specific loss of function mouse mutants. They find Dll4/Notch1 signal promotes HCC progression, while the Jag1/Notch2 signal antagonistically suppresses it.

De Novo Hepatocellular Carcinoma in Hepatitis C-Related Cirrhosis: Are Advanced Glycation End Products a Key Driver?

Background and Purpose

The advanced glycation end products (AGEs) have been implicated in different diseases’ pathogenesis, but their role in hepatocellular carcinoma (HCC) is still a matter of debate. This study aims to investigate the association of AGEs with HCC development in patients with hepatitis C-related cirrhosis.

Methods

Only 153 of the 181 non-diabetic patients with cirrhosis were consecutively involved in this pilot cohort prospective study, along with 34 healthy control participants. Demographic characteristics, biochemical parameters, clinical data, and AGEs levels in all subjects at the starting point and every year after that for two years were assessed. Multivariable Cox regression analysis was used to settle variables that could predict HCC development within this period.

Results

HCC developed in 13 (8.5%) patients. Univariate Cox regression analysis reported that body mass index (P=0.013), homeostatic model assessment-insulin resistance (P=0.006), alpha-fetoprotein (P <0.001), and AGEs levels (P <0.001) were related to HCC development. After adjusting multiple confounders, the multivariable Cox regression model has revealed that AFP and AGEs were the powerful parameters related to the HCC occurrence (all P<0.05). AGEs at a cutoff value of more than 79.6 ng/ml had 100% sensitivity, 96.4% specificity, and 0.999 area under the curve (all P<0.001), using the receiver operating characteristic curve, for prediction of HCC development.

Conclusion

This work suggests that AGEs are associated with an increased incidence of HCC, particularly in cirrhosis, which is encouraging in decreasing the risk of HCC in these patients.

Role of Serum Vitamin D, Interleukin 13, and microRNA-135a in Hepatocellular Carcinoma and Treatment Failure in Egyptian HCV-Infected Patients Receiving Direct Antiviral Agents

Direct-acting antivirals (DAAs) are used for hepatitis C virus (HCV) treatment. However, treatment failure and hepatocellular carcinoma (HCC) development following treatment was reported. In this study, we assessed the role of serum vitamin D, interleukin 13 (IL-13), and microRNA-135a in the prediction of treatment failure with DAA and HCC development among Egyptian HCV-infected patients. A total of 950 patients with HCV-related chronic liver disease underwent DAA treatment. Before DAAs, serum vitamin D and IL-13 were determined by ELISA, and gene expression of miRNA-135a was assessed in serum by real-time PCR. The predictive abilities of these markers were determined using the receiver operating characteristic (ROC) curve. Sustained virological response (SVR) was achieved in 92.6% of HCV-infected patients (responders). High viral load, IL-13, miRNA-135a, and low vitamin D levels were associated with treatment failure and HCC development. HCC development was recorded in non-responders, but not in the responders (35.7% vs. 0% p < 0.001). In conclusion: serum IL-13, Vitamin D, and miRNA-135a could be potential biomarkers in monitoring DAA treatment and HCC prediction. DAAs-induced SVR may decrease the incidence of HCC.

Daclatasvir and Sofosbuvir Mitigate Hepatic Fibrosis Through Downregulation of TNF-α / NF-κB Signaling Pathway

BACKGROUND

Hepatic fibrosis is the major issue in chronic liver diseases such as chronic hepatitis C virus (HCV). The newly approved direct acting antiviral (DAA) agents such as Sofosbuvir (SOF) and daclatasvir (DAC) have been found to be associated with decreased fibrotic markers in HCV patients.

AIM

This study tried to explore whether the reported antifibrotic effect of these drugs is antiviral dependent or drug induced.

METHOD

Hepatic fibrosis was induced by (0.5ml/kg) CCl4 IP twice a week for six weeks. SOF (20 mg/kg/d) and DAC (30 mg/kg/d) were added in the last four weeks of treatments. Liver functions, fibrotic markers such as Hyaluronic acid and metalloproteinase-9 were detected using immunoassay. The expression of TNF-α/NF-κB signaling pathway as well as Bcl-2 were done using immunoassay.

RESULTS

SOF and DAC exerted a potent antifibrotic effect evidenced by their activity against hyaluronic acid HA and metalloproteinase MMP-9 significantly (P≤0.001). This effect was further proved histopathologically where liver tissues from rats treated by drugs showed marked inhibition of collagen precipitation as well as inhibition of HSCs activation. This antifibrotic action was associated with decreased expression of TNF-α /NF-κB signaling pathway and induction of Bcl-2.

CONCLUSION

SOF/ DAC antifibrotic effect is independent of its antiviral activity. The molecular events associated with this effect were the downregulation of TNF-α / NF-κB signaling pathway and induction of Bcl-2.

Correlation Between Vascular Endothelial Growth Factor and Long-Term Occurrence of HCV-Related Hepatocellular Carcinoma After Treatment with Direct-Acting Antivirals

We aimed to evaluate the correlation between vascular endothelial growth factor (VEGF) and long-term occurrence of hepatocellular carcinoma after HCV treatment with direct-acting antivirals (DAAs) and the HCC stage. Two groups with HCV-related liver cirrhosis and HCC were included: group 1, HCC following DAAs; group 2, HCC did not receive DAAs. The serum level of VEGF and HCC staging was evaluated. The duration between DAAs and HCC was 21.81 ± 11.66 months. Portal vein thrombosis (PVT) was observed more in group 1 (31%). VEGF was relatively elevated in group 1 compared to group 2. HCC patients after DAAs, showed elevated VEGF with frequent PVT.

Molecular Crosstalk between the Hepatitis C Virus and the Extracellular Matrix in Liver Fibrogenesis and Early Carcinogenesis

Simple Summary

In the era of direct-acting antivirals against the hepatitis C virus (HCV), curing chronic hepatitis C has become a reality. However, while replicating chronically, HCV creates a peculiar state of inflammation and oxidative stress in the infected liver, which fuels DNA damage at the onset of HCV-induced hepatocellular carcinoma (HCC). This cancer, the second leading cause of death by cancer, remains of bad prognosis when diagnosed. This review aims to decipher how HCV durably alters elements of the extracellular matrix that compose the liver microenvironment, directly through its viral proteins or indirectly through the induction of cytokine secretion, thereby leading to liver fibrosis, cirrhosis, and, ultimately, HCC.

Abstract

Chronic infection by the hepatitis C virus (HCV) is a major cause of liver diseases, predisposing to fibrosis and hepatocellular carcinoma. Liver fibrosis is characterized by an overly abundant accumulation of components of the hepatic extracellular matrix, such as collagen and elastin, with consequences on the properties of this microenvironment and cancer initiation and growth. This review will provide an update on mechanistic concepts of HCV-related liver fibrosis/cirrhosis and early stages of carcinogenesis, with a dissection of the molecular details of the crosstalk during disease progression between hepatocytes, the extracellular matrix, and hepatic stellate cells.

Prevention of Hepatitis C Virus Infection and Liver Cancer

Hepatocellular carcinoma (HCC) is the fifth most prevalent cancer and the second leading cause of cancer-related death worldwide.

Recommendations of the Polish Group of Experts for HCV for the treatment of hepatitis C in 2020

The recommendations set out the principles of diagnosis and treatment of hepatitis C virus (HCV) infections according to the most recent knowledge. The main goal of therapy for HCV infection is to eliminate the virus from the body, which consequently leads to arrest of progress or regression of changes in the liver. Current version of the recommendations prioritise pangenotypic regimens and provide guidelines in special populations of patients, such as children, cirrhotics, human immunodeficiency virus (HIV) and hepatitis B virus (HBV) coinfected, those with renal failure, hepatic decompensation and non-responders to previous therapies.

Elevation of Memory Cytotoxic T Lymphocytes, Including Human T Lymphotropic Virus Type 1 Tax-Specific and Hepatitis Virus Type C-Specific Cytotoxic T Lymphocytes, in a Patient with Adult T-Cell Leukemia/Lymphoma and Hepatocellular Carcinoma

Herein, we present the case of a patient who suffered from adult T-cell leukemia/lymphoma (ATLL) and hepatocellular carcinoma (HCC) after obtaining a sustained virological response following treatment with a direct-acting antiviral (DAA) at different points in time. The patient went into complete remission (CR) for ATLL. Unfortunately, subsequent relapse of ATLL was observed. This situation was overcome using chemotherapy with pegylated interferon alpha-2b. Human T lymphotropic virus type 1 Tax-specific cytotoxic T lymphocytes (CTLs) were recognized after obtaining second CR, and those CTLs have been maintained for many years. After 4 years from the second CR, chronic hepatitis type C was treated with a DAA, and sustained virological response was attained. However, the occurrence of HCC was detected. Surprisingly, the tumor disappeared spontaneously. Hepatitis virus type C-specific CTLs were also detected in the patient. T-cell receptor (TCR) V beta gene repertoire analyses revealed oligoclonal expansion of effector and memory CTLs. The number of CTLs expressing the TCR V beta 13.1 has increased over the years since HCC occurrence. The activation and maintenance of anticancer cellular immunity may have allowed the patient to obtain long-term survival and overcome two lethal neoplasms.

Risk of Hepatocellular Carcinoma after HCV Clearance by Direct-Acting Antivirals Treatment Predictive Factors and Role of Epigenetics

Direct-acting antivirals (DAAs) induce a rapid virologic response (SVR) in up to 99% of chronic hepatitis C patients. The role of SVR by DAAs on the incidence or recurrence of hepatocellular carcinoma (HCC) is still a matter of debate, although it is known that SVR does not eliminate the risk of HCC. In this review, we made an updated analysis of the literature data on the impact of SVR by DAAs on the risk of HCC as well as an assessment of risk factors and the role of epigenetics. Data showed that SVR has no impact on the occurrence of HCC in the short-medium term but reduces the risk of HCC in the medium-long term. A direct role of DAAs in the development of HCC has not been demonstrated, while the hypothesis of a reduction in immune surveillance in response to the rapid clearance of HCV and changes in the cytokine pattern influencing early carcinogenesis remains to be further elucidated. HCV induces epigenetic alterations such as modifications of the histone tail and DNA methylation, which are risk factors for HCC, and such changes are maintained after HCV clearance. Future epigenetic studies could lead to identify useful biomarkers and therapeutic targets. Cirrhosis has been identified as a risk factor for HCC, particularly if associated with high liver stiffness and α-fetoprotein values, diabetes and the male sex. Currently, considering the high number and health cost to follow subjects' post-HCV clearance by DAAs, it is mandatory to identify those at high risk of HCC to optimize management.

Hepatocellular Carcinoma Mechanisms Associated with Chronic HCV Infection and the Impact of Direct-Acting Antiviral Treatment

Hepatitis C virus (HCV) infection is the major risk factor for liver cirrhosis and hepatocellular carcinoma (HCC). The mechanisms of HCC initiation, growth, and metastasis appear to be highly complex due to the decade-long interactions between the virus, immune system, and overlapping bystander effects of host metabolic liver disease. The lack of a readily accessible animal model system for HCV is a significant obstacle to understand the mechanisms of viral carcinogenesis. Traditionally, the primary prevention strategy of HCC has been to eliminate infection by antiviral therapy. The success of virus elimination by antiviral treatment is determined by the SVR when the HCV is no longer detectable in serum. Interferon-alpha (IFN-α) and its analogs, pegylated IFN-α (PEG-IFN-α) alone with ribavirin (RBV), have been the primary antiviral treatment of HCV for many years with a low cure rate. The cloning and sequencing of HCV have allowed the development of cell culture models, which accelerated antiviral drug discovery. It resulted in the selection of highly effective direct-acting antiviral (DAA)-based combination therapy that now offers incredible success in curing HCV infection in more than 95% of all patients, including those with cirrhosis. However, several emerging recent publications claim that patients who have liver cirrhosis at the time of DAAs treatment face the risk of HCC occurrence and recurrence after viral cure. This remains a substantial challenge while addressing the long-term benefit of antiviral medicine. The host-related mechanisms that drive the risk of HCC in the absence of the virus are unknown. This review describes the multifaceted mechanisms that create a tumorigenic environment during chronic HCV infection. In addition to the potential oncogenic programming that drives HCC after viral clearance by DAAs, the current status of a biomarker development for early prediction of cirrhosis regression and HCC detection post viral treatment is discussed. Since DAAs treatment does not provide full protection against reinfection or viral transmission to other individuals, the recent studies for a vaccine development are also reviewed.

Systematic review with meta-analysis: effectiveness of direct-acting antiviral treatment for hepatitis C in patients with hepatocellular carcinoma

BACKGROUND

Direct-acting antiviral (DAA) therapy for hepatitis C virus (HCV) infection is highly curative and tolerable. Among patients with hepatocellular carcinoma (HCC), optimal timing of DAA therapy remains unclear. Data on efficacy of DAA therapy in patients with HCC would inform this decision-making.

AIM

To evaluate response to DAA therapy among patients diagnosed with HCV infection and HCC.

METHODS

Bibliographic databases and conference abstracts were searched. Meta-analysis was conducted to pool sustained virologic response (SVR) estimates.

RESULTS

Fifty-six studies with 5522 patients with HCV and HCC were included. Overall SVR was 88.3% (95% CI 86.1-90.4). Twenty-seven studies included patients with prior or present HCC (n = 3126) and patients without HCC (n = 49 138), in which SVR was 88.2% (95% CI 85.0-91.4) and 92.4% (95% CI 91.1-93.7) among patients with and without HCC, respectively (odds ratio: 0.54, 95% CI 0.43-0.68, P < .001). In the subgroup analyses, higher SVR was seen in patients who received curative HCC management (SVR 90.4%, 95% CI 88.3-92.4), or treated with sofosbuvir + NS5A inhibitor DAAs (SVR 96.9%, 95% CI 94.3-99.4), or in patients with HCV genotype 1 infection (SVR 92.0%, 95% CI 88.1-95.6).

CONCLUSION

Response to DAA therapy was lower in patients with HCC compared to those without HCC, regardless of cirrhosis status. Among HCC patients, there was an impact of proportion with curative HCC management on DAA therapy response.

Risk of De Novo Hepatocellular Carcinoma Following Use of Direct Acting Antiviral Medications for Treatment of Chronic Hepatitis C

Direct-acting antivirals (DAA) are now the mainstay of treatment for patients with chronic hepatitis C virus (HCV); however, there is some controversy over whether use of DAAs for HCV, as compared with IFN-based regimens, leads to an increased risk for hepatocellular carcinoma (HCC) development. We investigated the association between use of DAAs and subsequent development of HCC in longitudinal data from patients with HCV from diverse backgrounds (various ages, ethnicities, and geographic regions) across the United States. The design was a retrospective study performed using medical and pharmacy claims from OptumLabs. HCV treatment exposure was categorized as DAA-only, DAA + IFN, any-DAA, or IFN-only. To account for confounding by indication, inverse probability of treatment weighting was performed. Cox proportional hazard models were used to calculate hazard ratios (HR) and 95% confidence intervals (CI). We identified 5,781 patients with HCV with no history of HCC at baseline. Compared with IFN-only regimen, no significant increase in HCC risk was found for use of DAA-only (HR, 1.53; 95% CI, 0.73-3.23), DAA + IFN (HR, 1.02; 95% CI, 0.51-2.06), or any-DAA (HR, 1.04; 95% CI, 0.65-1.65). When stratified by sustained virological response (SVR), we noted a higher HCC risk for DAA-only among patients who achieved SVR post-treatment (HR, 7.53; 95% CI, 1.48-38.34), but the CIs were wide, which might be due to the small sample size of the subgroups. Among those who did not achieve SVR, no association was found for use of DAA-only (HR, 0.59; 95% CI, 0.19-1.91). These findings do not provide compelling evidence for the conception that use of DAAs for HCV is associated with increased risk of HCC development.

Hepatitis C Antiviral Therapy In Patients With Successfully Treated Hepatocellular Carcinoma: Dancing With Wolves

Hepatitis C virus (HCV) infection is known to be one of the leading causes of hepatocellular carcinoma (HCC) all over the world. Previously, multiple studies have confirmed a decreased rate of HCC occurrence or recurrence in the cases of hepatitis C associated cirrhosis after treatment with interferon, in comparison to the untreated cases, even in the absence of clearance of HCV. Treatment programs with direct-acting antivirals (DAAs) as a new method for HCV treatment and cure in 2014, with higher safety and efficacy, were considered as an important step in the treatment of patients with history of HCC, improving their overall prognosis. Recently, reports coming from various European centers claimed that the risk of HCC increased following DAAs therapy, especially in cases with previous HCC. Moreover, other studies revealed that the recurrence of HCC after DAAs treatment was more aggressive. Even though others were not able to conclude the same results, the role of DAA therapy in recurrence of HCC in patients with previous HCC after sustained virological response (SVR) achievement remains questionable. This review explored the existing literature and discussed opinions on the possibility of increasing recurrence of HCC following DAA therapy, possible mechanisms, predictors of HCC recurrence post DAAs, and whether those patients should be treated or not.

The influence of direct-acting antivirals in hepatitis C virus related hepatocellular carcinoma after curative treatment

This study was done to elucidate the influence of direct-acting antiviral (DAA) agents on the recurrence of hepatocellular carcinoma (HCC) in patients with hepatitis C virus (HCV)-related HCC (HCV-HCC) after curative therapies. HCV-HCC patients who received curative therapies and obtained a complete response were analyzed. From January 2017 to September 2017, 112 HCV-HCC patients received DAA and obtained a sustained virological response (SVR). From January 2006 to December 2014, another 345 HCV-HCC patients received peg-interferon-based treatment and 118 obtained SVR. From January 2012 to December 2016, 248 HCV-HCC patients had complete HCC response and did not receive antiviral treatment. Patients were divided into DAA, IFN, and Untreated groups based on what antiviral treatment they received. There were 82 patients in the DAA group, 80 patients in the IFN group, and 160 patients in the Untreated group. During the follow-up period, the DAA group had 22 (26.8%) recurrent cases, whereas the IFN group had 46 (56.8%) cases after antiviral treatment. Among the 22 recurrent cases in the DAA group, 19 (86.9%) experienced HCC recurrence during 1 year after DAA initiation. Compared with the IFN group, the DAA group had poorer one-year recurrence-free survival (75.4% vs. 95%, p < 0.001), even after adjustment with propensity score matching (81.4% vs. 93.9%, p = 0.034). However, DAA was an improving factor for HCC recurrence compared with the Untreated group in the multivariate analysis. Among HCV-HCC patients with complete treatment, those with DAA-induced SVR had a higher one-year recurrence rate than those who received IFN-based antiviral therapy, but DAA did not seem to increase HCC recurrence compared to untreated patients.

No evidence for higher rates of hepatocellular carcinoma after direct-acting antiviral treatment: a meta-analysis

Aim:

Hepatitis C virus (HCV) is the leading cause of hepatocellular carcinoma (HCC) in the United States. Achieving sustained viral response with interferon (IFN) treatment reduces the risk from 3%-5% to 0.5%-1% annually. Several studies reported unexpectedly high rates of HCC after treatment with direct-acting antivirals (DAAs). The aim of our study was to compare HCC rates in DAA-, IFN-treated and untreated populations.

Methods:

A literature search was conducted using ScienceDirect, Ovid®, Web of Science and MEDLINE through January 2019. Studies were included if they measured rates of de novo or recurrent HCC (following curative treatment) in HCV-infected persons. We included 138 studies (n = 177,512). Simple pooling of data and meta-analysis were performed, using the random effects method.

Results:

Mean age was higher in the DAA-treated vs. IFN-treated group (58.4 years vs. 52.6 years; P = 0.0073), as were diabetes prevalence (34.5% vs. 11.7%; P ≤ 0.001) and incident cirrhosis (47.8% vs. 34.2%, P = 0.0017). The incidence rate of de novo HCC was 2.01/100 person-years (py) (95%CI: 1.38, 2.67) in the DAA group and 1.45/100py (95%CI: 0.98, 1.94) in the IFN-treated group. HCC recurred at 16.76/100py (95%CI: 10.75, 22.91) in the DAA-treated group vs. 20.04/100py (95%CI: 2.58, 45.21) after IFN. After adjusting for factors such as age and cirrhosis, the hazard ratio was 0.58 (95%CI: 0.20, 1.07) for HCC occurrence and 0.59 (95%CI: 0.24, 1.03) for HCC recurrence after DAA treatment compared to IFN-based treatment.

Conclusion:

We did not find evidence for increased rates of HCC in DAA-treated compared with IFN-treated patients. Compared to those treated with IFN, older patients with additional risk factors for HCC were treated with DAAs. This imbalance appears to explain the higher numerical incidence of HCC among DAA-treated patients.

AGA Clinical Practice Update on Interaction Between Oral Direct-Acting Antivirals for Chronic Hepatitis C Infection and Hepatocellular Carcinoma: Expert Review

DESCRIPTION

The purpose of this clinical practice update is to evaluate the evidence describing the interaction between direct-acting antiviral (DAA) therapy for hepatitis and hepatocellular carcinoma (HCC) with regard to HCC incidence, HCC recurrence, and DAA efficacy, and to summarize best practice advice regarding HCC surveillance and timing of DAA therapy.

METHODS

The recommendations outlined in this expert review are based on available published evidence, including observational studies and systematic reviews, and incorporates expert opinion where applicable. BEST PRACTICE ADVICE 1: DAA treatment is associated with a reduction in the risk of incident HCC. The relative risk reduction is similar in patients with and without cirrhosis. BEST PRACTICE ADVICE 2: Patients with advanced liver fibrosis (F3) or cirrhosis should receive surveillance imaging before initiating DAA treatment. BEST PRACTICE ADVICE 3: Patients with advanced liver fibrosis (F3) or cirrhosis at the time of DAA treatment represent the highest-risk group for HCC after DAA-induced sustained virologic response. These patients should stay in HCC surveillance. BEST PRACTICE ADVICE 4: HCC surveillance should be performed using ultrasound with or without α-fetoprotein every 6 months. Current data do not support shorter surveillance intervals or the use of alternative surveillance modalities. BEST PRACTICE ADVICE 5: Future studies may show a reduction in HCC risk over time after DAA-induced sustained virologic response. However, in the interim, HCC surveillance should continue indefinitely if patients are otherwise eligible for potentially curative therapy. BEST PRACTICE ADVICE 6: The presence of active HCC is associated with a small but statistically significant decrease in sustained virologic response with DAA therapy. BEST PRACTICE ADVICE 7: Patients with HCC who are eligible for potentially curative therapy with liver resection or ablation should defer DAA therapy until after HCC treatment is completed. BEST PRACTICE ADVICE 8: Timing of DAA therapy for patients with HCC who are listed for liver transplantation should be determined with consideration of median wait times, availability of hepatitis C virus-positive organs, and degree of liver dysfunction. BEST PRACTICE ADVICE 9: There are insufficient data evaluating benefits and cost-effectiveness of DAA therapy in patients with active intermediate or advanced HCC. Decisions regarding DAA treatment in these patients should be considered in light of HCC tumor burden, degree of liver dysfunction, life expectancy, and patient preferences. BEST PRACTICE ADVICE 10: There are no conclusive data that DAA therapy is associated with increased or decreased risk, differential time to recurrence, or aggressiveness of recurrent HCC in patients with complete response to HCC therapy. BEST PRACTICE ADVICE 11: DAA therapy should not be withheld from patients with complete response to HCC therapy; however, DAA therapy can be deferred 4-6 months to confirm response to HCC therapy. BEST PRACTICE ADVICE 12: Patients with complete response to HCC therapy who are treated with DAAs have a continued risk of HCC recurrence and require HCC surveillance, which should be conducted indefinitely with dynamic contrast-enhanced computed tomography or magnetic resonance imaging every 3-6 months. Current data do not support more frequent surveillance in these patients. This Clinical Practice Update was produced by the AGA Institute.

Tolerability and effectiveness of generic direct-acting antiviral drugs in eradication of hepatitis C genotype 4 among Egyptian patients

BACKGROUND

We investigated tolerability and effectiveness of generic, less expensive direct antiviral drugs in the treatment of hepatitis C virus genotype 4 (HCV GT-4) in an Egyptian cohort.

PATIENTS AND METHODS

Retrospectively, we analysed data from 648 patients with HCV GT4 attending Alexandria Main University Hospital from January 2016 to May 2017 [488 treatment naïve/160 treatment-experienced/288 with chronic hepatitis/360 with cirrhosis]. Patients received generic sofosbuvir/ledipasvir (n = 168, treatment naïve = 136, treatment-experienced = 32) or sofosbuvir/daclatasvir (n = 480, treatment naïve = 352, treatment-experienced = 128) ± ribavirin. We assessed sustained virologic response 12 weeks after treatment, non-response, relapse, treatment discontinuation and drug adverse reactions.

RESULTS

An overall sustained virologic response 12 weeks after treatment was achieved in 97.8%, non-response in 0.6%, relapse in 0.3% and discontinuation of treatment in 1.3% of patients. Sofosbuvir/ledipasvir ± ribavirin regimen attained an overall sustained virologic response 12 weeks after treatment in 96.4% of patients (100% of treatment-experienced vs 95.6% of treatment naïve, P = 0.28), vs 98.3% for sofosbuvir/daclatasvir ± ribavirin regimen (100% of treatment-experienced vs 97.7% of treatment naïve, P = 0.08). No severe drug adverse events or deaths were reported except anaemia due to ribavirin.

CONCLUSION

Generic direct antiviral drugs used in treating Egyptian patients with HCV GT-4 demonstrated equal potency, safety and tolerability compared to original brands, with low cost which would help to provide treatment to a larger scale of patients.

Direct-Acting Antiviral Therapy Not Associated With Recurrence of Hepatocellular Carcinoma in a Multicenter North American Cohort Study

BACKGROUND & AIMS

There is controversy over the effects of direct-acting antiviral (DAA) therapies for hepatitis C virus (HCV) infection on hepatocellular carcinoma (HCC) recurrence and tumor aggressiveness. We compared HCC recurrence patterns between DAA-treated and untreated HCV-infected patients who had achieved a complete response to HCC treatment in a North American cohort.

METHODS

We conducted a retrospective cohort study of patients with HCV-related HCC with a complete response to resection, local ablation, transarterial chemo- or radioembolization, or radiation therapy from January 2013 through December 2017 at 31 health systems throughout the United States and Canada. Cox regression was used to examine the association between DAA therapy and time to recurrence after a complete response, with DAA therapy analyzed as a time-varying exposure. We also estimated the association between DAA therapy and risk of early HCC recurrence (defined as 365 days after complete response).

RESULTS

Of 793 patients with HCV-associated HCC, 304 (38.3%) received DAA therapy and 489 (61.7%) were untreated. HCC recurred in 128 DAA-treated patients (42.1%; early recurrence in 52 patients) and 288 untreated patients (58.9%; early recurrence in 227 patients). DAA therapy was not associated with HCC recurrence (hazard ratio 0.90, 95% confidence interval 0.70-1.16) or early HCC recurrence (hazard ratio 0.96, 95% confidence interval 0.70-1.34) after we adjusted for study site, age, sex, Child-Pugh score, α-fetoprotein level, tumor burden, and HCC treatment modality. In DAA-treated and untreated patients, most recurrences were within the Milan criteria (74.2% vs 78.8%; P = .23). A larger proportion of DAA-treated than untreated patients received potentially curative HCC therapy for recurrent HCC (32.0% vs 24.6%) and achieved a complete or partial response (45.3% vs 41.0%) but this did not achieve statistical significance.

CONCLUSION

In a large cohort of North American patients with complete response to HCC treatment, DAA therapy was not associated with increased overall or early HCC recurrence. HCC recurrence patterns, including treatment response, were similar in DAA-treated and untreated patients.

Incidence and risk factors of hepatocellular carcinoma change over time in patients with hepatitis C virus infection who achieved sustained virologic response

AIM

In patients with chronic hepatitis C, hepatocellular carcinoma (HCC) occurs at a certain frequency, even if a sustained virologic response (SVR) is achieved by antiviral treatment. Old age, liver fibrosis, and high post-treatment α-fetoprotein (AFP) level are typical risk factors of post-SVR HCC. We examined whether the frequencies and factors of HCC in patients with an SVR achieved from interferon treatment changed. Methods Among patients prospectively registered for pegylated interferon and ribavirin treatment, 2021 with an SVR without HCC development during the treatment period were followed up. The mean observation period was 49.5 ± 26.2 months.

RESULTS

The multivariable Cox regression analysis showed that older age, diabetes mellitus, advanced liver disease, and higher post-treatment AFP level were the independent risk factors throughout the observation period. The annual occurrence rate of HCC was 0.74% in the third year, 0.54% in the fourth year, and 0.40% in the fifth year; it gradually decreased from the third year. Because the time course hazards for HCC changed at 48 months, we separately analyzed its risk factors before and after this change point. The multivariable Cox regression analysis showed that the four above-mentioned factors were significantly related to HCC development within 4 years. Conversely, the univariable Cox regression analysis only identified diabetes mellitus as a significant factor for HCC development after 4 years.

CONCLUSION

The frequency of HCC in hepatitis C patients who achieved an SVR from interferon treatment decreased during the observation period, and its risk factors changed between the early and late periods.

Interval between hepatocellular carcinoma treatment and interferon-free direct-acting antiviral agents against hepatitis C is necessary to suppress tumor recurrence

Interferon (IFN) has been identified to suppress carcinogenesis when used for treating hepatitis C virus (HCV) infections. Treatment with IFN-free direct-acting antiviral agents (DAAs) is an acceptable alternative, even in elderly patients or patients who have been treated for hepatocellular carcinoma (HCC), because it has a lower incidence of side effects and higher sustained virological response (SVR) rate compared with IFN treatment. However, the suppression of carcinogenesis by DAAs is unclear. In the present study, 19 patients who underwent DAA treatment following treatment for HCC between January 2015 and March 2017 were retrospectively investigated. The clinical data were compared between 9 patients with HCC recurrence following DAA treatment (recurrence group) and 10 patients without HCC recurrence (no-recurrence group). The 1-year cumulative recurrence rate of HCC following SVR was as high as 50.2%. Age and sex did not significantly differ between the two groups, and the average number of HCC treatments prior to DAA treatment was also not significantly different between the recurrence and no-recurrence groups (3.2 and 2.2, respectively). The median interval between the final HCC treatment and the commencement of DAA treatment was 88 days in the recurrence group, which was significantly less compared with 790 days in the no-recurrence group (P=0.018). An interval of 120 days or more from final HCC treatment to the commencement of DAA treatment was a significant independent factor of no HCC recurrence following DAA treatment (P=0.028). A high HCC recurrence rate was identified following DAA treatment in patients with a history of HCC treatment. Therefore, there should be at least a 4-month interval from the final HCC treatment to the commencement of DAA treatment to ensure no HCC recurrence.

Impact of direct-acting antivirals on leukocytic DNA telomere length in hepatitis C virus-related hepatic cirrhosis

BACKGROUND

Direct-acting antiviral (DAAs) represent advancement in the management of hepatitis C virus (HCV)-related hepatic cirrhosis. A high proportion of patients achieve a sustained virologic response; eradication of HCV is coupled with a decreased risk of hepatocellular carcinoma. Recent evidence suggests that shortening of the DNA telomere may be linked to cellular senescence as well as predisposition to malignant transformation.

OBJECTIVE

This study aimed to assess pretreatment leukocytic DNA telomere length in HCV-related cirrhosis and post viral eradication using DAAs.

PATIENTS AND METHODS

This study included 24 patients with HCV-related cirrhosis, Child-Pugh A. Whole-blood samples were obtained from patients before treatment and 12 weeks after the end of treatment, as well as from 24 healthy controls. Terminal restriction fragment, corresponding to telomere length, was measured using a nonradioactive Southern blot technique, detected by chemiluminescence.

RESULTS

DNA telomere length was significantly shorter before treatment compared with 12 weeks after end of treatment in HCV-related cirrhotic patients. Also, it was significantly shorter in patients before treatment compared with healthy individuals.

CONCLUSION

Telomere elongation in blood leukocytes can be considered a marker of recovery of inflammation after DAAs-induced HCV eradication. Still, the possibility of activation by cancer initiation cannot be excluded.

The Immunogenicity in Mice of HCV Core Delivered as DNA Is Modulated by Its Capacity to Induce Oxidative Stress and Oxidative Stress Response

HCV core is an attractive HCV vaccine target, however, clinical or preclinical trials of core-based vaccines showed little success. We aimed to delineate what restricts its immunogenicity and improve immunogenic performance in mice. We designed plasmids encoding full-length HCV 1b core and its variants truncated after amino acids (aa) 60, 98, 152, 173, or up to aa 36 using virus-derived or synthetic polynucleotides (core191/60/98/152/173/36_191v or core152s DNA, respectively). We assessed their level of expression, route of degradation, ability to trigger the production of reactive oxygen species/ROS, and to activate the components of the Nrf2/ARE antioxidant defense pathway heme oxygenase 1/HO-1 and NAD(P)H: quinone oxidoreductase/Nqo-1. All core variants with the intact N-terminus induced production of ROS, and up-regulated expression of HO-1 and Nqo-1. The capacity of core variants to induce ROS and up-regulate HO-1 and Nqo-1 expression predetermined their immunogenicity in DNA-immunized BALB/c and C57BL/6 mice. The most immunogenic was core 152s, expressed at a modest level and inducing moderate oxidative stress and oxidative stress response. Thus, immunogenicity of HCV core is shaped by its ability to induce ROS and oxidative stress response. These considerations are important in understanding the mechanisms of viral suppression of cellular immune response and in HCV vaccine design.

Sustained Type I Interferon Reinforces NK Cell-Mediated Cancer Immunosurveillance during Chronic Virus Infection

The importance of natural killer (NK) cells in the early immune response to viral or bacterial infection is well known. However, the phenotype, function, and physiologic role of NK cells during the late stage of persistent viral infection have not been extensively studied. Here, we characterized NK cells in mice persistently infected with lymphocytic choriomeningitis virus clone 13 and showed that in contrast to NK cells from acutely infected or uninfected mice, NK cells from chronically infected mice expressed a terminally differentiated phenotype, stronger cytotoxicity, and reduced inhibitory receptor expression. In an in vivo tumor model, chronically infected mice exhibited significantly delayed tumor progression in an NK cell-dependent manner. NK cells from chronically infected mice also expressed high STAT1, and blocking the type I interferon (IFN) receptor revealed that type I IFN signaling directly regulated NK cell cytotoxicity. Our findings indicate that sustained type I IFN signaling during chronic viral infection potentiates the cytolytic function of NK cells and contributes to NK cell-dependent host immune surveillance.

Is there increased risk of hepatocellular carcinoma recurrence in liver transplant patients with direct-acting antiviral therapy?

BACKGROUND

Recently, a controversy has emerged: is the rate of recurrence of hepatocellular carcinoma (HCC) higher following treatment of hepatitis C virus (HCV) with direct-acting antiviral (DAA) therapy? However, the risk of HCC recurrence has not been studied in liver transplant (LTx) recipients who received DAA therapy. The aim of the present study is to compare the rate of HCC recurrence in LTx recipients who did or did not receive DAA therapy.

PATIENTS AND METHODS

Sixty-three patients received LTx with HCC. Twenty-seven (42.9%) with HCV received DAA therapy (Group A), 20 (31.7%) with HCV did not receive DAA therapy (Group B), and 16 (25.4%) did not have HCV (Group C).

RESULTS

In group A, three (11%), in group B, one (5%), and in group C, none had recurrence of HCC. Actuarial 4-year recurrence-free survival was 88.9, 95, and 100% in group A, B, and C, respectively (p = 0.37). Group A was subdivided into two groups for comparison with Group B: A1 included five patients who had end of treatment response (ETR) without sustained virological response (SVR), and A2 included 20 patients who achieved SVR. Three patients from A1 had HCC recurrence and no patients from A2 had HCC recurrence. (p = 0.0038; group A1, A2, and B).

CONCLUSIONS

The rate of HCC recurrence in LTx patients with DAA therapy was significantly higher with ETR, without SVR, after DAA therapy compared to patients with SVR or patients who did not receive DAA therapy. LTx recipients with HCC receiving DAA therapy requires further studies.

Tumor behavior of hepatocellular carcinoma after hepatitis C treatment by direct-acting antivirals: comparative analysis with non-direct-acting antivirals-treated patients

INTRODUCTION

Scarce reports have commented on hepatocellular carcinoma (HCC) behavior after direct-acting antivirals (DAAs).

AIM

To analyze differences in tumor behavior between patients with hepatitis C virus (HCV)-induced HCC and were either treated or not using DAAs.

PATIENTS AND METHODS

This case-control study includes patients with HCV-related HCC who received generic DAAs (group I) and all non-DAA treated patients with HCC who presented to our clinic during the same period (group II). Patient and tumor characteristics, treatment types and outcome were compared between the two groups.

RESULTS

Group I included 89 patients and group II included 207 patients. No significant difference was detected between groups regarding HCC number or size. Group I showed a more infiltrative HCC pattern, whereas group II had more circumscribed and delineated lesions. The incidence of portal vein thrombosis and significant lymphadenopathy was significantly higher in group I (P=0.03 and 0.03, respectively). Serum levels of α-fetoprotein were significantly higher in group I (P=0.02). These factors significantly affected the response to HCC management (P=0.03). Incidence of complete responses were 47.2 and 49.8% for groups I and II, respectively, whereas incomplete responses were 12.4 and 25.1%, respectively. Supportive treatment was applied to 40.4% in group I and 25.1% in group II.

CONCLUSION

HCC behavior was more aggressive in DAA-treated patients regarding portal vein thrombosis, malignant lymphadenopathy, and HCC imaging characteristics, which affected the chance of ablation and the treatment response.

The development of hepatocellular carcinoma in HCV-infected patients treated with DAA: A comprehensive analysis

It has been proven that hepatitis C virus (HCV) eradication after interferon-based treatment can reduce the risk of hepatocarcinogenesis. However, there were some arguments about whether the treatment of direct-acting antivirals (DAAs) boosts the development of hepatocellular carcinoma (HCC). We systematically review this crucial topic by combining all the relevant articles to calculate the pooled HCC density after DAA treatment. Studies reporting the recurrence or occurrence in chronic hepatitis C patients who received DAA regimen were selected from three retrieval library screening. Data on baseline and outcomes were extracted independently by three observers. Primary outcomes were incidence density of HCC. Pooled estimates of HCC occurrence and recurrence rate per 100 person-years (py) were undertaken by random-effects meta-analysis. Sixteen studies with 61334 patients, embracing 20 cohorts, were enrolled in this study and divided into two groups (HCC occurrence and HCC recurrence). In the pooled analysis, HCC developed at a rate of 3.5/100 py [95% confidence interval (CI): 2.4, 5.3] among patients without a history of HCC compared with 17.4/100 py (95% CI: 7.8, 39.0) among patients existed. Furthermore, HCC occurrence rate following DAA-induced sustained virological response (SVR) was 2.1/100 py (95% CI: 1.4, 3.4); however, the rate in patients without SVR was 9.1/100 py (95% CI: 5.4, 15.3). HCV cured after DAA therapy could induce a reduction of 78% in the risk of HCC occurrence compared with non-responders. There is no strong evidence for an increased risk of HCC occurrence or recurrence in patients treated by DAA. There was a significant decline in the incidence of HCC occurrence after SVR.

Molecular Mechanisms Involved in HCC Recurrence after Direct-Acting Antiviral Therapy

Chronic hepatitis C is associated with a high risk of developing hepatocellular carcinoma (HCC) because of a direct effect of the Hepatitis C Virus (HCV) proteins and an indirect oncogenic effect of chronic inflammation and impaired immune response. The treatment of chronic hepatitis C markedly reduces all-cause mortality; in fact, interferon-based treatment has shown a reduction of HCC incidence of more than 70%. The recent introduction of the highly effective direct-acting antivirals (DAAs) has completely changed the scenario of chronic hepatitis C (CHC) with rates of HCV cure over 90%. However, an unexpectedly high incidence of HCC recurrence was observed in patients after DAA treatment (27% versus 0.4–2% in patients who received interferon treatment). The mechanism that underlies the high rate of tumor relapse is currently unknown and is one of the main issues in hepatology. We reviewed the possible mechanisms involved in HCC recurrence after DAA treatment.

Modulation of the Immune System in Chronic Hepatitis C and During Antiviral Interferon-Free Therapy

The treatment of patients with chronic hepatitis C virus (HCV) infection has changed tremendously over the past 2 years, with an increasing variety of all-oral direct-acting antiviral (DAA) treatment regimens available for different HCV genotypes and distinct clinical settings. These treatments have significantly improved safety in patients with advanced liver disease compared with interferon (IFN)-based regimens. HCV modifies the human immune system to escape immunosurveillance via several mechanisms. One of the basic mechanisms of HCV is the ability to “switch” the immune response by reducing the activity of cells responsible for the elimination of virus-infected cells. IFN-free DAA treatment regimens provide a unique opportunity to assess the effect of HCV elimination on the immune system. Abrupt changes in the immune system can in some cases be responsible for two alarming processes: viral reactivation in patients with chronic hepatitis B and recurrence of hepatocellular carcinoma in patients with previous successful cancer treatment.

Hepatocellular carcinoma after direct-acting antiviral drug treatment in patients with hepatitis C virus

Background and Aim

Given the use of direct‐acting antivirals (DAAs) to treat hepatitis C virus (HCV), their effects on hepatocarcinogenesis should be determined.

Methods

This study enrolled 349 patients with HCV who underwent DAA treatment at our hospital between 2014 and 2018. Their median age was 65 years, and 184 were male; 301 cases were of HCV serotype 1, and 48 were of serotype 2. The DAA treatment was daclatasvir/asunaprevir in 107 cases, sofosbuvir (SOF)/ledipasvir in 147 cases, ritonavir‐boosted ombitasvir/paritaprevir in 28 cases, elbasvir/grazoprevir in 19 cases, and SOF/ribavirin in 48 cases. The patients’ histories included hepatocellular carcinoma (HCC) in 45 cases, liver transplant (LT) in 10 cases, and kidney transplant (KT) in 17 cases.

Results

Sustained virological responses occurred in 335 cases (96%). DAA treatment was initiated a median of 16.3 months after HCC treatment. After DAA treatment, 15 cases (33%) had recurrence of HCC after a median of 11.6 months, and 3 cases (1%) developed de novo HCC. Six LT patients and one KT patient had HCC; however, no HCC was observed after DAA. The incidence of HCC was significantly higher in patients with multiple HCC treatments in the Cox hazard model (hazard ratio 1.664, 95% confidence interval 1.134–2.441, P < 0.01). Surgical resection or LT reduced the risk of HCC.

Conclusions

DAA did not increase the rate of HCC, even in immunosuppressed patients. However, careful follow‐up for HCC recurrence is required in previously treated cases.

Impact of direct-acting antiviral agents on the development of hepatocellular carcinoma: evidence and pathophysiological issues

Hepatitis C virus (HCV) infection is currently one of the main causes of cirrhosis and hepatocellular carcinoma (HCC) at a global level. Recently, a new generation of direct-acting antiviral agents (DAAs) has entered the HCV treatment landscape, providing impressively high rates of sustained virological response (SVR), and is expected to lead to an eventual decrease in HCV-related cirrhosis, liver transplantation and mortality. However, during the first years of their use, several studies reported a possible correlation between DAA treatment and an increased risk of HCC. Following the publication of larger prospective studies, the risk of de novo HCC occurrence has clearly been proven to be lower after the achievement of SVR, regardless of antiviral treatment. On the other hand, the risk of HCC recurrence following treatment with DAAs is debatable; existing data remain controversial, possibly because of the lack of large, well designed cohorts with more homogeneous patient populations. With regard to the pathophysiology behind the above observations, especially in patients with previous HCC history, HCC development could possibly be favored by the changes in the immunological milieu and the different cellular behavior after eradication of HCV infection with DAA treatment.

Incidence of Hepatocellular Carcinoma After Direct Antiviral Therapy for HCV in Patients With Cirrhosis Included in Surveillance Programs

BACKGROUND & AIMS

Retrospective studies have found an unexpectedly high incidence of hepatocellular carcinoma (HCC) among patients with hepatitis C virus (HCV)-associated cirrhosis who received direct-acting antiviral (DAA) agents. We analyzed data from the ANRS CO12 CirVir cohort to compare the incidence of HCC in patients with cirrhosis who received DAA therapy vs patients treated with interferon (IFN).

METHODS

Data were collected from 1270 patients with compensated biopsy-proven HCV-associated cirrhosis recruited from 2006 through 2012 at 35 centers in France. For descriptive purpose, patients were classified as follows: patients who received DAA treatment (DAA group, n = 336), patients who achieved a sustained virologic response (SVR) following an IFN-based regimen (SVR-IFN group, n = 495), or patients who never received DAA treatment and never had an SVR following IFN therapy (non-SVR group, n = 439). The patients were included in HCC surveillance programs based on ultrasound examination every 6 months, and clinical and biological data were recorded. To account for confounding by indication due to differences in patient characteristics at treatment initiation, we constructed a time-dependent Cox regression model weighted by the inverse probability of treatment and censoring (IPTCW) to assess the treatment effects of DAA on time until HCC.

RESULTS

Compared with patients in the SVR-IFN group, patients in the DAA group were older, higher proportions had diabetes or portal hypertension, and liver function was more severely impaired. The crude 3-year cumulative incidences of HCC were 5.9% in the DAA group, 3.1% in the SVR-IFN group, and 12.7% in the non-SVR group (overall P < .001; unadjusted hazard ratio [HR] for HCC 2.03; 95% confidence interval [CI] 1.07-3.84; P = .030 for the DAA group vs the SVR-IFN group). HCC characteristics were similar among groups. Among patients with HCC, the DAA group received less-frequent HCC screening than the other 2 groups (P = .002). After Cox analyses weighted by the IPTCW, we found no statistically significant increase in risk of HCC associated with DAA use (HR 0.89; 95% CI 0.46-1.73; P = .73).

CONCLUSIONS

Analysis of data from the ANRS CO12 CirVir cohort reveals that the apparent increase in HCC incidence observed in patients with cirrhosis treated with DAAs compared with patients who achieved SVR following an IFN therapy can be explained by patient characteristics (age, diabetes, reduced liver function) and lower screening intensity.

Recurrence of hepatocellular carcinoma after direct acting antiviral treatment for hepatitis C virus infection: Literature review and risk analysis

Although studies suggest decreased incident hepatocellular carcinoma (HCC) after treatment with direct-acting antivirals (DAAs) for hepatitis C virus (HCV) infection, data are conflicting regarding risk and aggressiveness of recurrence in patients who have a history of treated HCC. This review analyses data available in literature in order to elucidate the impact of DAAs on the risk of HCC recurrence after successful treatment of the tumor. Overall 24 papers were identified. The available data cannot be considered definitive, but the initial alarmist data indicating an increased risk of recurrence have not been confirmed by most subsequent studies. The suggested aggressive pattern (rapid growth and vascular invasion) of tumor recurrence after DAAs still remains to be confirmed. Several limitations of the available studies were highlighted, and should drive future researches. The time-to-recurrence should be computed since the last HCC treatment and results stratified for cirrhosis and sustained viral response. Any comparison with historical series is of limited interest because of a number of biases affecting these studies and differences between enrolled patients. Prospective intention-to-treat analyses will be probably the best contribution to drive clinical practice, provided that a randomized trial can be difficult to design.

Epidemiology and Elimination of HCV-Related Liver Disease

Hepatitis C virus (HCV) infection, defined by active carriage of HCV RNA, affects nearly 1.0% of the worldwide population. The main risk factors include unsafe injection drug use and iatrogenic infections. Chronic HCV infection can promote liver damage, cirrhosis and hepatocellular carcinoma (HCC) in affected individuals. The advent of new second-generation, direct-acting antiviral (DAA) agents allow a virological cure in more than 90% of treated patients, and therefore prevent HCV-related complications. Recently, concerns have been raised regarding the safety of DAA-regimens in cirrhotic patients with respect to the occurrence and the recurrence of HCC. Here, we review the current available data on HCV epidemiology, the beneficial effects of therapy, and discuss the recent controversy with respect to the potential link with liver cancer. We also highlight the challenges that have to be overcome to achieve the ambitious World Health Organization objective of HCV eradication by 2030.

Extrahepatic cancers are the leading cause of death in patients achieving hepatitis B virus control or hepatitis C virus eradication

Data on extrahepatic cancers (EHCs) in compensated viral cirrhosis are limited. The objective of the prospective multicenter Agence Nationale de Recherche sur le SIDA et les Hépatites virales CO12 CirVir cohort was to assess the occurrence of all clinical events in patients with compensated viral cirrhosis, including all types of cancer. Patients with the following inclusion criteria were enrolled in 35 French centers: (1) biopsy-proven hepatitis B virus (HBV) or hepatitis C virus (HCV) cirrhosis, (2) Child-Pugh A, or (3) absence of previous liver complications including primary liver cancer (PLC). Patients were followed up prospectively every 6 months. The standardized mortality ratio (SMR) was calculated according to age and gender using 5-year periods. The impact of sustained viral response (SVR) in HCV patients and maintained viral suppression in HBV patients were assessed using time-dependent analysis. A total of 1,671 patients were enrolled between 2006 and 2012 (median age, 54.9 years; men, 67.3%; HCV, 1,323; HBV, 317; HCV-HBV, 31). Metabolic features and excessive alcohol and tobacco consumption were recorded in 15.2%, 36.4%, and 56.4% of cases, respectively. After a median follow-up of 59.7 months, 227 PLCs were diagnosed (5-year cumulative incidence [CumI] 13.4%) and 93 patients developed EHC (14 patients with lymphoid or related tissue cancer and 79 with solid tissue cancer; 5-year EHC CumI, 5.9%). Compared to the general French population, patients were younger at cancer diagnosis, with significantly higher risk of EHC in HCV patients (SMR, 1.31; 95 confidence interval [CI], 1.04-1.64; P = 0.017) and after SVR (SMR = 1.57; 95% CI, 1.08-2.22; P = 0.013). EHC was the fourth leading cause of death in the whole cohort and the first in patients with viral control/eradication.

CONCLUSION

Compared to the general French population, HCV cirrhosis is associated with a higher risk of EHC and the first cause of death in patients with viral cirrhosis who achieve virological control/eradication. (Hepatology 2018).

The road map toward an hepatitis C virus-free transplant population

Antiviral therapy to eradicate hepatitis C virus (HCV) infection improves outcomes in patients undergoing liver transplantation (LT) for advanced chronic HCV with or without hepatocellular carcinoma. Traditionally, antiviral therapy focused on the use of interferon (IFN)-based regimens, with antiviral treatment initiated in the posttransplant period once recurrent HCV disease with fibrosis in the allograft was identified. The use of IFN-based therapy was limited in pretransplant patients with advanced liver disease. Earlier intervention, either before transplantation or early after LT, is now feasible with the advent of second-generation direct-acting antiviral agents (DAAs) with superior tolerability and efficacy to IFN-based therapy. These agents have the potential to reduce the number of patients developing HCV-related complications requiring LT and retransplantation, as well as reducing the demand for donor organs. We discuss the pros and cons of pretransplant, peritransplant, and posttransplant therapy with current DAAs, citing available data from clinical trials and real-world experience.

Hepatocellular carcinoma occurrence in DAA-treated hepatitis C virus patients: Correlated or incidental? A brief review

Hepatitis C virus (HCV) chronic infection induces liver fibrosis and cirrhosis but is also responsible for a significant portion of hepatocellular carcinoma (HCC) occurrence. Since it was recognized as a causative factor of chronic hepatitis, there have been multiple efforts towards viral eradication, leading to the first-generation HCV treatment that was based on interferon (IFN)-αand its analogs, mainly PEGylated interferon-α (PEG IFNα). Sustained virological response (SVR), defined as the absence of detectable RNA of HCV in blood serum for at least 24 wk after discontinuing the treatment, was accepted as a marker of viral clearance and was achieved in approximately one-half of patients treated with PEG IFNα regimens. Further research on the molecular biology of HCV gave rise to a new generation of drugs, the so-called direct antiviral agents (DAAs). DAA regimens, as implied by their name, interfere with the HCV genome or its products and have high SVR rates, over 90%, after just 12 wk of per os treatment. Although there are no questions about their efficacy or their universality, as they lack the contraindication for advanced liver disease that marks PEG IFNα, some reports of undesired oncologic outcomes after DAA treatment raised suspicions about possible interference of this treatment in HCC development. The purpose of the present review is to investigate the validity of these concerns based on recent clinical studies, summarize the mechanisms of action of DAAs and survey the updated data on HCV-induced liver carcinogenesis.

Use of direct-acting antivirals for hepatitis C viral infection and association with intrahepatic cholangiocarcinoma: Is there a linkage?

Hepatitis C viral infection is recognized worldwide as a leading cause of cirrhosis and hepatocellular carcinoma. The goal of hepatitis C viral antiviral therapy is the permanent eradication of hepatitis C viral RNA, commonly referred to as a sustained virologic response - defined as "undetectable" RNA at 12 weeks following the completion of therapy. Hepatitis C viral treatment has dramatically advanced with the FDA approval of several new agents known as direct-acting antivirals. These drugs target specific nonstructural proteins of the virus, which disrupt viral replication, and therefore halt infection. However, recently, there has been a concern for increased risk of recurrence of treated hepatocellular carcinoma or denovo occurrence of hepatocellular carcinoma after treatment with direct-acting antivirals. We are now reporting three cases of intrahepatic cholangiocarcinoma that developed after sustained virologic response following hepatitis C viral treatment with direct-acting antivirals.

Direct-acting antivirals do not increase the risk of hepatocellular carcinoma recurrence after local-regional therapy or liver transplant waitlist dropout

Whether direct-acting antivirals (DAAs) increase the risk of hepatocellular carcinoma (HCC) recurrence after tumor-directed therapy is controversial. We sought to determine the impact of DAA therapy on HCC recurrence after local-regional therapy (LRT) and waitlist dropout among liver transplant (LT) candidates with HCC. We performed a retrospective cohort study of 149 LT candidates with hepatitis C virus (HCV) and HCC at a single center from 2014 through 2016. Cumulative incidence of HCC recurrence post-LRT and waitlist dropout was estimated by the DAA group. Factors associated with each outcome were evaluated using competing risks regression. A propensity score stabilized inverse probability weighting approach was used to account for differences in baseline characteristics between groups. The no DAA group (n = 87) had more severe cirrhosis and lower rates of complete radiologic tumor response after LRT than those treated with DAA (n = 62) but had similar alpha-fetoprotein and tumor burden at listing. Cumulative incidence of HCC recurrence within 1 year of complete response after LRT was 47.0% in the DAA group and 49.8% in the no DAA group (P = 0.93). In adjusted competing risk analysis using weighted propensity score modeling, risk of HCC recurrence was similar in the DAA group compared to those without DAA (hazard ratio [HR], 0.91; 95% confidence interval [CI], 0.58-1.42; P = 0.67). Patients treated with DAAs had lower risk of waitlist dropout due to tumor progression or death compared to the no DAA group in adjusted weighted analysis (HR, 0.30; 95% CI 0.13-0.69; P = 0.005).

CONCLUSION

In LT candidates with HCV and HCC with initial complete response to LRT, DAA use is not associated with increased risk of HCC recurrence but rather is associated with reduced risk of waitlist dropout due to tumor progression or death. (Hepatology 2018).

Hepatitis C virus treatment by direct-acting antivirals in successfully treated hepatocellular carcinoma and possible mutual impact

BACKGROUND AND AIMS

Treatment of hepatitis C virus (HCV) after successfully treated hepatocellular carcinoma (HCC) becomes possible with the introduction of direct-acting antivirals because of their favorable efficacy, safety, and short period of treatment. Few data are available on the results of treatment using different direct-acting antiviral regimens in successfully treated HCC and a lot of debate about its role in tumor recurrence.

METHODS

Sixty-two HCV-related HCC patients were enrolled in the study after successfully treated HCC; the studied population included either Child-Pugh 'A' or 'B7'. The patients were subcategorized to receive one of the following regimens: group 1: sofosbuvir (SOF)+ribavirin (RBV) for 24 weeks, group 2: SOF+simeprevir for 12 weeks, group 3: SOF+daclatasvir for 24 weeks, and group 4: SOF+daclatasvir+RBV for 12 weeks. The overall median follow-up period is 12 months after treatment initiation.

RESULTS

All treatment regimens were tolerable for all patients, with no reported major adverse events during treatment. The overall sustained virologic response rate was 64.5%, with the highest result in group 4 and the lowest result in group 1; 87.5 and 26.7%, respectively. HCC recurrence was observed in 42% of patients; 80.7% of these patients developed recurrence within 6 months of treatment initiation.

CONCLUSION

Treatment of HCV in successfully treated HCC is feasible, with the best results achieved using multiple direct-acting antivirals and RBV; a high rate of HCC recurrence was observed, especially within the first 6 months of treatment initiation (ClinicalTrials.gov no: NCT02771405).

Newly diagnosed hepatocellular carcinoma in patients with advanced hepatitis C treated with DAAs: A prospective population study

BACKGROUND & AIMS

Direct-acting antiviral agents (DAAs) are safe and effective in patients with hepatitis C. Conflicting data were reported on the risk of hepatocellular carcinoma (HCC) during/after therapy with DAAs. The aim of this study was to evaluate the incidence of newly diagnosed HCC and associated risk factors in patients with advanced hepatitis C treated with DAAs.

METHODS

The study is based on the NAVIGATORE platform, a prospectively recording database of all patients with hepatitis C receiving DAAs in the Veneto region of Italy. The inclusion criteria were: fibrosis stage ≥F3. The exclusion criteria were: Child-Turcotte-Pugh (CTP)-C, liver transplantation before DAAs, history or presence of HCC, follow-up <4 weeks after starting DAAs. A total of 3,917 out of 4,234 consecutive patients were included, with a mean follow-up of 536.2 ± 197.6 days.

RESULTS

Overall, HCC was diagnosed in 55 patients. During the first year, HCC incidence was 0.46% (95% CI 0.12-1.17) in F3, 1.49% (1.03-2.08) in CTP-A and 3.61% (1.86-6.31) in CTP-B cirrhotics; in the second year, HCC incidences were 0%, 0.2%, and 0.69%, respectively. By multivariate analysis, HCC was significantly associated with an aspartate aminotransferase to platelet ratio ≥2.5 (hazard ratio [HR] 2.03; 95% CI 1.14-3.61; p = 0.016) and hepatitis B virus infection (HR 3.99; 1.24-12.91; p = 0.021). Failure to achieve a sustained virological response was strongly associated with development of HCC (HR 9.09; 5.2-16.1; p = 0.0001). A total of 29% of patients with HCC had an aggressive tumor, often seen in the early phase of treatment.

CONCLUSIONS

These data, obtained in a large, prospective, population-based study, indicate that in patients with advanced hepatitis C receiving DAAs, the risk of "de novo" hepatocarcinoma during the first year is not higher, and might be lower, than that of untreated patients. The risk further declines thereafter. Early hepatocarcinoma appearance may reflect pre-existing, microscopic, undetectable tumors.

LAY SUMMARY

Hepatocellular carcinoma is one of the complications of hepatitis C related cirrhosis. Treating patients with advanced hepatitis C with the new interferon-free direct-acting antiviral agents has been associated with improvement in liver function and survival, while more conflicting data have been reported regarding the risk of hepatocellular carcinoma. We report the results of a prospective population study on the incidence of newly diagnosed hepatocellular carcinoma in patients with advanced hepatitis C treated with direct-acting antiviral agents, clearly indicating that the residual hepatocellular carcinoma risk is reduced and declines progressively with time after a sustained virological response. Development of a liver tumor during/after therapy was associated with known risk factors and with virological failure.