APASL consensus statements and recommendation on treatment of hepatitis C

The Asian-Pacific Association for the Study of the Liver (APASL) convened an international working party on the ''APASL consensus statements and recommendation on management of hepatitis C'' in March, 2015, in order to revise ''APASL consensus statements and management algorithms for hepatitis C virus infection (Hepatol Int 6:409-435, 2012)''. The working party consisted of expert hepatologists from the Asian-Pacific region gathered at Istanbul Congress Center, Istanbul, Turkey on 13 March 2015. New data were presented, discussed and debated to draft a revision. Participants of the consensus meeting assessed the quality of cited studies. Finalized recommendations on treatment of hepatitis C are presented in this review.

# Introduction
The major aim of antiviral treatment for chronic hepatitis C is to prevent liver-related complications, including HCC, by achievement of sustained virologic response (SVR) [bib_ref] APASL consensus statements and management algorithms for hepatitis C virus infection, Omata [/bib_ref] [bib_ref] Asian-Pacific Association for the Study of the Liver consensus statements on the..., Asian-Pacific ; Mccaughan [/bib_ref].
Electronic supplementary material The online version of this article (doi:10.1007/s12072-016-9717-6) contains supplementary material, which is available to authorized users.
The combination of peginterferon plus ribavirin can lead to *50 and *80 % SVR in patients infected with HCV genotype (GT)-1/GT-4 or HCV GT-2/GT-3, respectively [bib_ref] New antiviral therapies for chronic hepatitis C, Kanda [/bib_ref]. In the direct-acting antivirals (DAAs) era, DAAs with peginterferon plus ribavirin can shorten the treatment duration and lead to *90 % SVR in HCV GT-1-infected patients with interleukin-28B (IL28B, IFN-lambda 3) favorable single nucleotide polymorphism (SNP). But these treatments have many adverse events associated with interferon use which hamper the patients in accomplishing the treatments. Recently, interferon-free treatment has played a central role in the eradication of HCV. In this article, we aim to introduce the recent advances of interferon-free therapies for the patients with chronic HCV various genotypes in Asian-Pacific countries. Grading of evidence and recommendations are shown in [fig_ref] Table 1: Future perspectives of all-oral treatment for HCV genotype 1 in Asian-Pacific Region [/fig_ref].

## Interferon supersensitive group
Some viral and host factors are related to supersensitivity to the interferon-based therapy HCV GT-2 is supersensitive to interferon-based therapy. The sustained virological response (SVR) rates with 24-week peginterferon and ribavirin treatment in chronic HCV GT-2 are around 80 % in western countries [bib_ref] Peginterferon alfa-2b plus ribavirin for treatment of chronic hepatitis C in previously..., Zeuzem [/bib_ref] [bib_ref] Peginterferon alfa-2b and ribavirin for 12 vs. 24 weeks in HCV genotype..., Mangia [/bib_ref] [bib_ref] Peginterferon alfa-2a and ribavirin for 16 or 24 weeks in HCV genotype..., Shiffman [/bib_ref] [bib_ref] Pegylated interferon alfa and ribavirin for 14 versus 24 weeks in patients..., Dalgard [/bib_ref] [bib_ref] Randomized comparison of 12 or 24 weeks of peginterferon alpha-2a and ribavirin..., Lagging [/bib_ref]. In the chronic HCV GT-2 trial from Taiwan, the SVR rates by treating with peginterferon and ribavirin can be higher than 95 % if the patients achieve a rapid virologic response (RVR) [bib_ref] A randomised study of peginterferon and ribavirin for 16 versus 24 weeks..., Yu [/bib_ref].
For chronic HCV GT-1 patients with RVR, high SVR rates, near 90 %, can be obtained by the peginterferon and ribavirin combination therapy [bib_ref] Early identification of HCV genotype 1 patients responding to 24 weeks peginterferon..., Jensen [/bib_ref]. The SVR rates were as high as 95 % by treating with peginterferon and ribavirin combination therapy in chronic HCV GT-1 patients with RVR and low viral load at baseline, even with the treatment duration shortened to 24 weeks [bib_ref] Rapid virological response and treatment duration for chronic hepatitis C genotype 1..., Yu [/bib_ref] [bib_ref] Efficacy of 24 weeks treatment with peginterferon alfa-2b plus ribavirin in patients..., Zeuzem [/bib_ref] [bib_ref] Pegylated interferon-alpha-2a plus ribavirin for treatment-naive Asian patients with hepatitis C virus..., Liu [/bib_ref] [bib_ref] Individualized treatment strategy according to early viral kinetics in hepatitis C virus..., Berg [/bib_ref]. The study by Atlanta Medical Center also demonstrated that the 24-week peginterferon and ribavirin regimen may have equal efficacy as a 28-week lead-in then boceprevir and peginterferon plus ribavirin triple therapy in chronic HCV GT-1 patients with low viral load and RVR [bib_ref] Hepatitis C genotype 1 virus with low viral load and rapid virologic..., Pearlman [/bib_ref].
Several genome-wide association studies have demonstrated that host SNPs near the IL28B gene are associated with SVR to the treatment with peginterferon alfa and ribavirin in chronic hepatitis C patients [bib_ref] Genetic variation in IL28B predicts hepatitis C treatment-induced viral clearance, Ge [/bib_ref] [bib_ref] Genome-wide association of IL28B with response to pegylated interferon-alpha and ribavirin therapy..., Tanaka [/bib_ref] [bib_ref] IL28B is associated with response to chronic hepatitis C interferon-alpha and ribavirin..., Suppiah [/bib_ref]. These SNPs are also associated with spontaneous clearance of HCV in acute HCV infection. The various distributions of IL28B polymorphisms among different populations worldwide may, at least partly, explain the heterogeneity in the responses to interferon-based treatments among different ethnic groups. The IL28B SNPs are strongly associated with SVR rates in patients who are infected with HCV GT-1 or GT-4 and receive combination treatment with peginterferon alfa and ribavirin [bib_ref] Genetic variation in IL28B predicts hepatitis C treatment-induced viral clearance, Ge [/bib_ref] [bib_ref] Genome-wide association of IL28B with response to pegylated interferon-alpha and ribavirin therapy..., Tanaka [/bib_ref] [bib_ref] IL28B is associated with response to chronic hepatitis C interferon-alpha and ribavirin..., Suppiah [/bib_ref] [bib_ref] Interleukin-28B genetic variants in identification of hepatitis C virus genotype 1 patients..., Huang [/bib_ref] [bib_ref] Interleukin-28B polymorphism improves viral kinetics and is the strongest pretreatment predictor of..., Thompson [/bib_ref] [bib_ref] Host interleukin-28B genetic variants versus viral kinetics in determining responses to standard-of-care..., Huang [/bib_ref]. However, the association between IL28B variations and treatment response in patients infected with HCV GT-2 or GT-3 is still controversial [bib_ref] Role of interleukin-28B polymorphisms in the treatment of hepatitis C virus genotype..., Yu [/bib_ref] [bib_ref] An IL28B polymorphism determines treatment response of hepatitis C virus genotype 2..., Mangia [/bib_ref] [bib_ref] Importance of IL28B gene polymorphisms in hepatitis C virus genotype 2 and..., Sarrazin [/bib_ref].
IL28B variations are associated with very early on-treatment viral kinetics in chronic hepatitis C patients who undergo interferon alfa-based therapy, and are the strongest pretreatment predictor of treatment response in patients infected with HCV GT-1 [bib_ref] Interleukin-28B genetic variants in identification of hepatitis C virus genotype 1 patients..., Huang [/bib_ref] [bib_ref] Host interleukin-28B genetic variants versus viral kinetics in determining responses to standard-of-care..., Huang [/bib_ref] [bib_ref] Role of interleukin-28B polymorphisms in the treatment of hepatitis C virus genotype..., Yu [/bib_ref] [bib_ref] An IL28B polymorphism determines treatment response of hepatitis C virus genotype 2..., Mangia [/bib_ref] [bib_ref] Importance of IL28B gene polymorphisms in hepatitis C virus genotype 2 and..., Sarrazin [/bib_ref]. Regarding the retreatment with peginterferon and ribavirin in chronic HCV GT-1 and GT-2 patients, the SVR rate for prior-relapser was quite good [bib_ref] Clinical utility of host genetic IL-28B variants in hepatitis C virus genotype..., Huang [/bib_ref] [bib_ref] Virological predictors of response to retreatment in hepatitis C genotype 2 infected..., Huang [/bib_ref]. However, the response was only found in the relapsers with favorable IL28B genotypes. Therefore, for the countries in which direct acting antiviral agents are available, generic drugs are not available, and only have limited resources, peginterferon and ribavirin combination therapy may be considered in chronic HCV GT-1, GT-4, or GT-6 treatment-naive patients with low viral load and favorable IL28B genotypes and in HCV GT-2 or GT-3 naive patients [bib_ref] New treatments for HCV: perspective from Asia, Yu [/bib_ref]. For the treatment-experienced patients, the peginterferon and ribavirin combination therapy can only be considered in relapsers with favorable IL28B genotype and non-cirrhotic patients. Is interferon still needed in DAA affordable countries?
The development of direct acting antiviral agents and their inclusion in all-oral, interferon-free regimes has been the central element of the revolution in therapy for HCV infection. These new treatments are safe and very effective and there are virtually no medical reasons to withhold therapy [bib_ref] Treatment of HCV with ABT-450/r-ombitasvir and dasabuvir with ribavirin, Feld [/bib_ref]. Penetration of new interferon-free therapies into standard management plans in many countries in the Asian-Pacific region has been very slow despite outstanding responses to therapy in virtually every subgroup of patients treated to date [bib_ref] Ledipasvir and sofosbuvir for previously treated HCV genotype 1 infection, Afdhal [/bib_ref] [bib_ref] Ledipasvir and sofosbuvir for untreated HCV genotype 1 infection, Afdhal [/bib_ref]. The delay in making these drugs available to patients is their high cost which is limiting uptake-irrespective of whether funding is patient-based or by government reimbursement. Restricted access to therapy is not limited to resource-restricted countries as many people living in countries with relatively high gross domestic products (GDP) still have limited availability. It is within this context that providers of health care are attempting to determine if there is a place remaining for the less expensive interferon-containing regimes in the emerging treatment paradigms. Interferon has been a partner in the treatment of HCV for three decades and has played an important role in curing many patients and reducing their subsequent risk of cirrhosis or HCC [bib_ref] Clinical, virological, histologic, and biochemical outcomes after successful HCV therapy: a 5-year..., George [/bib_ref]. Indeed, we have learnt much in the decades of experience gained using interferon-containing regimes. Optimising dosing regimens [bib_ref] Peginterferon alfa-2b and ribavirin for 12 vs. 24 weeks in HCV genotype..., Mangia [/bib_ref] , PEGylation to improve pharmacokinetics [bib_ref] A randomized, double-blind trial comparing pegylated interferon alfa-2b to interferon alfa-2b as..., Lindsay [/bib_ref] , adding ribavirin [bib_ref] Peginterferon alfa-2b plus ribavirin compared with interferon alfa-2b plus ribavirin for initial..., Manns [/bib_ref] and discovering host genetic and other factors as well as viral characteristics that influence response [bib_ref] Predictors of response to chronic hepatitis C treatment, Ridruejo [/bib_ref] have all been major advances that enhanced treatment response rates. However, there are a number of disadvantages of interferon therapy that have limited its uptake and ensured that its role in antiviral therapy for HCV will eventually become largely obsolete. The side-effect profile and adverse effects of interferon therapy are substantial. In one report from Asia, up to 50 % of patients were judged to be unsuitable to commence therapy. Interferon-based therapy is lengthy-up to 1 year for genotype 1 patients-and requires substantial human and laboratory infrastructure to ensure safety, compliance and optimal dosing and treatment duration. The nature of the therapy limits its use to major treatment centers with only limited, if any, uptake in isolated areas. For these reasons, treatment uptake rates with interferon-based regimes have been modest, with some countries reporting treatment rates of only 5 % even when diagnosis rates were greater than 50 % [bib_ref] Estimates on HCV disease burden worldwide-filling the gaps, Wedemeyer [/bib_ref].
In contrast, direct acting antiviral regimes are very well tolerated and treatment duration is shorter potentially falling to 8 weeks in some HCV populations [bib_ref] Ledipasvir and sofosbuvir for 8 or 12 weeks for chronic HCV without..., Kowdley [/bib_ref]. Studies to date have shown outstanding treatment response rates across all genotypes, in previously treated and untreated subjects, pre and post liver transplant patients, HIV coinfected individuals and those with more advanced liver disease [bib_ref] Sofosbuvir and ribavirin for treatment of compensated recurrent hepatitis C virus infection..., Charlton [/bib_ref] [bib_ref] Sofosbuvir and ribavirin prevent recurrence of HCV infection after liver transplantation: an..., Curry [/bib_ref] [bib_ref] ABT-450/r-ombitasvir and dasabuvir with ribavirin for hepatitis C with cirrhosis, Poordad [/bib_ref] [bib_ref] Retreatment of HCV with ABT-450/r-ombitasvir and dasabuvir with ribavirin, Zeuzem [/bib_ref] [bib_ref] Ombitasvir plus paritaprevir plus ritonavir with or without ribavirin in treatmentnaive and..., Hezode [/bib_ref] [bib_ref] Sofosbuvir plus ribavirin for treatment of hepatitis C virus in patients co-infected..., Molina [/bib_ref]. As stated earlier, there are virtually no medical reasons to withhold therapy. In this context it is not flippant to suggest that, at present, the only indication for interferon-based therapies is no access to direct acting antiviral therapies.
Arguments in favor of maintaining interferon therapies are that Asian patients respond reasonably well to these therapies, due in part to the enrichment of the population with the favorable IL28B allele. In HCV GT-1 Asian subjects, SVR of 75 % have been reported [bib_ref] Chronic hepatitis C genotype 1 treatment roadmap for resource constrained settings, Lim [/bib_ref] , with even more impressive responses in HCV GT-2 and GT-3 subjects. However, the issues that limit interferon uptake still exist as does on-treatment side effects and infrastructure requirements. Thus with current rates of therapy and continued use of interferon-based regimes, most countries in the Asian-Pacific region will continue on the inevitable path towards the peak of population morbidity and mortality predicted from HCV epidemiological studies and judged to be 10-20 years hence. Reducing the regional impact of this disease should be a major goal of governments in the Asian-Pacific region and this aim increases the urgency with which treatments should be made available. Of course, to have any impact on HCV-related disease burden, access to therapy must be increased. Without increasing access to care, the number of treated patients will not change. In the absence of such policies to increase access to direct acting antivirals, we are going to compound global inequalities in treatment and disease burden and individual suffering. The efforts by Gilead to assist in the provision of their medications to the 90 countries with the lowest GDP are to be congratulated. Global viral eradication was never going to be feasible with interferoncontaining regimes. In contrast, there is a distinct possibility of eliminating HCV in the Asian-Pacific region with oral antiviral agents if sufficient attention is also paid to primary prevention.

## All-oral treatment for hcv gt-1 infection
In the Asian-Pacific region, except Australia, Iran, New Zealand, Philippines and Thailand, HCV GT-1b is the main subgenotype in HCV GT-1 [bib_ref] New antiviral therapies for chronic hepatitis C, Kanda [/bib_ref]. During the interferon era, HCV GT-1 was the most intractable among all HCV GTs when patients were treated with peginterferon plus ribavirin [bib_ref] APASL consensus statements and management algorithms for hepatitis C virus infection, Omata [/bib_ref]. Combined peginterferon plus ribavirin treatment for 48 weeks led to only *50 % SVR in HCV GT-1 and high viral load. The addition of HCV NS3/4A protease inhibitors such as telaprevir, boceprevir or simeprevir to peginterferon plus ribavirin can improve SVR rates and shorten the treatment duration. These therapies can lead to 70-80 % and 90-100 % SVR in treatment-naive and previous-treatment relapsers with HCV genotype 1b infection, respectively, but only *30 % SVR in previous-treatment null responders [bib_ref] APASL consensus statements and management algorithms for hepatitis C virus infection, Omata [/bib_ref] [bib_ref] Telaprevir for retreatment of HCV infection, Zeuzem [/bib_ref] [bib_ref] Simeprevir with pegylated interferon alfa 2a or 2b plus ribavirin in treatment-naive..., Manns [/bib_ref] [bib_ref] Simeprevir with pegylated interferon alfa 2a plus ribavirin in treatment-naive patients with..., Jacobson [/bib_ref] [bib_ref] Simeprevir plus sofosbuvir, with or without ribavirin, to treat chronic infection with..., Lawitz [/bib_ref] [bib_ref] Simeprevir versus telaprevir with peginterferon and ribavirin in previous null or partial..., Reddy [/bib_ref].
Furthermore, the combination of peginterferon plus ribavirin with or without protease inhibitor therapies usually results in various adverse events, which can occasionally be serious in certain patients despite those being treated with these therapies having been selected on the basis of SNPs of the IL28B gene and/or the inosine triphosphate pyrophosphatase (ITPA) gene [bib_ref] Genetic variation in IL28B predicts hepatitis C treatment-induced viral clearance, Ge [/bib_ref] [bib_ref] Genome-wide association of IL28B with response to pegylated interferon-alpha and ribavirin therapy..., Tanaka [/bib_ref] [bib_ref] IL28B is associated with response to chronic hepatitis C interferon-alpha and ribavirin..., Suppiah [/bib_ref] [bib_ref] ITPA gene variants protect against anaemia in patients treated for chronic hepatitis..., Fellay [/bib_ref]. It is difficult to use peginterferon in interferon-ineligible/intolerant patients and it is hard to cure HCV-infected patients with unfavorable IL28B or with advanced liver fibrosis using interferon-including regimens [bib_ref] Retreatment with telaprevir combination therapy in hepatitis C patients with well-characterized prior..., Muir [/bib_ref] [bib_ref] Will IL28B polymorphism remain relevant in the era of direct-acting antiviral agents..., Thompson [/bib_ref].
In 2010, interferon-free treatment for chronic HCV GT-1 infection was reported for the first time [bib_ref] Oral combination therapy with a nucleoside polymerase inhibitor (RG7128) and danoprevir for..., Gane [/bib_ref]. In this INFORM-1 trial, the oral combination of a nucleoside analogue polymerase inhibitor and protease inhibitor provided a proof-of-concept of ''interferon-free treatment for chronic HCV GT-1'' without treatment-related serious or severe adverse events [bib_ref] Oral combination therapy with a nucleoside polymerase inhibitor (RG7128) and danoprevir for..., Gane [/bib_ref]. New DAAs against HCV have since been developed, and these combinations without peginterferon can improve the SVR rates and shorten the treatment durations.

## Ledipasvir and sofosbuvir

## Treatment-naive hcv gt-1 patients
Ledipasvir is an HCV NS5A inhibitor with antiviral activity against HCV GT-1 [bib_ref] A phase 1, randomized, placebo-controlled, 3-day, dose-ranging study of GS-5885, an NS5A..., Lawitz [/bib_ref]. Sofosbuvir is a nucleotide polymerase inhibitor with antiviral activity against HCV pan-genotypes [bib_ref] Sofosbuvir and ledipasvir fixed-dose combination with and without ribavirin in treatment-naive and..., Lawitz [/bib_ref]. After a phase 2 trial [bib_ref] Sofosbuvir and ledipasvir fixed-dose combination with and without ribavirin in treatment-naive and..., Lawitz [/bib_ref] , an ION-1 study (n = 865) was conducted: a multicenter, randomized, open-label phase 3 trial for treatment-naive HCV GT-1 patients with 12 or 24 weeks of a fixed-dose combination of ledipasvir (90 mg) and sofosbuvir (400 mg), with or without ribavirin [fig_ref] Figure 1: Sustained virological response [/fig_ref] [bib_ref] Ledipasvir and sofosbuvir for untreated HCV genotype 1 infection, Afdhal [/bib_ref]. A total of 67 % of the patients had HCV GT-1a infection, 70 % had the non-CC IL28B (rs12979860) genotype, and 16 % had cirrhosis. Of the 865 patients, only 3 patients had virological failure: one with HCV GT-1b had virological breakthrough, while the other two, one with HCV GT-1a and one with HCV GT-1b, had virological relapse. Concerning HCV NS5A-resistant associated variants (RAVs), the relapser with HCV GT-1a had the L31M variant, and both patients with HCV GT-1b had the Y93H variant at the time of virological failure. Two of the relapsers also had HCV NS5A RAVs at baseline [bib_ref] Ledipasvir and sofosbuvir for untreated HCV genotype 1 infection, Afdhal [/bib_ref]. Treatment with 12 weeks of a fixed-dose combination of ledipasvir and sofosbuvir, with or without ribavirin, led to SVR 12 weeks after the end of treatment (SVR12) in 97 % (211/217) or 99 % (211/214) of the patients, respectively. Treatment with 24 weeks of a fixeddose combination of ledipasvir and sofosbuvir, with or without ribavirin, led to SVR in 99 % (215/217) or 98 % (212/217) of the patients, respectively. Of the 33 patients who had a serious adverse event during treatment, 25 and 8 were in the 24-and 12-week regimens, respectively. Only 6 serious adverse events were observed, as follows: cellulitis, chest pain, gastroenteritis, hand fracture, non-cardiac chest pain and pneumonia, although fatigue, headache and nausea were the most common adverse events [bib_ref] Sofosbuvir and ledipasvir fixed-dose combination with and without ribavirin in treatment-naive and..., Lawitz [/bib_ref]. No patient in the 12-week group discontinued due to adverse events.
The ION-3 study (n = 647) consisted of a multicenter, randomized, open-label phase 3 trial for treatment-naive HCV GT-1 patients without cirrhosis with 8 weeks of the combination of ledipasvir (90 mg daily) and sofosbuvir (400 mg daily), with or without ribavirin, or with 12 weeks of the combination of ledipasvir (90 mg daily) and sofosbuvir (400 mg daily) without ribavirin [fig_ref] Figure 1: Sustained virological response [/fig_ref] [bib_ref] Ledipasvir and sofosbuvir for 8 or 12 weeks for chronic HCV without..., Kowdley [/bib_ref]. A total of 80 % of the patients had HCV GT-1a infection and 75 % of the total patients had non-CC IL28B (rs12979860) genotype. Treatment with 8 weeks of the combination of ledipasvir and sofosbuvir, with or without ribavirin, led to SVR12 in 93 % (201/216) or 94 % (202/215) patients, respectively. Treatment with 12 weeks of combination of ledipasvir and sofosbuvir without ribavirin led to SVR12 in 95 % (206/216). Of the 23 patients who had a relapse, 15 had HCV NS5A RAVs at the time of relapse and 8 did not. Of these 15 relapsed patients, 9 had RAVs at baseline and 6 did not. Adverse events were more associated with ribavirin [bib_ref] Ledipasvir and sofosbuvir for 8 or 12 weeks for chronic HCV without..., Kowdley [/bib_ref].
A Japanese study [bib_ref] Ledipasvir and sofosbuvir fixed-dose combination with and without ribavirin for 12 weeks..., Mizokami [/bib_ref] also showed that treatment with 12-week treatment with the combination of ledipasvir

## Treatment-experienced hcv gt-1 patients
An ION-2 study (n = 440) has been carried out, consisting of a randomized, open-label phase 3 trial for HCV GT-1 patients who had not had SVR after treatment with peginterferon and ribavirin, with or without a protease inhibitor, with 12 or 24 weeks of a fixed-dose combination of ledipasvir (90 mg) and sofosbuvir (400 mg), with or without ribavirin [fig_ref] Figure 1: Sustained virological response [/fig_ref] [bib_ref] Ledipasvir and sofosbuvir for previously treated HCV genotype 1 infection, Afdhal [/bib_ref]. In patients with decompensated cirrhosis, ribavirin plays a role in the achievement of SVR [bib_ref] Ledipasvir and sofosbuvir plus ribavirin for treatment of HCV infection in patients..., Charlton [/bib_ref]. The Japanese study [bib_ref] Ledipasvir and sofosbuvir fixed-dose combination with and without ribavirin for 12 weeks..., Mizokami [/bib_ref] also showed that 12-week treatment with a combination of ledipasvir (90 mg daily) and sofosbuvir (400 mg daily), with or without ribavirin, led to SVR12 in 100 % (87/87) or 100 % (88/88) of treatment-experienced HCV GT-1 patients, respectively.

## Paritaprevir/ritonavir and ombitasvir
A Japanese study (n = 73) comprised a randomized, openlabel phase 2 trial for HCV GT-1b patients who had not had SVR after treatment with peginterferon and ribavirin with 12 or 24 weeks of the combination of NS3/4A inhibitor paritaprevir (ABT-450)/ritonavir (100/100 mg or 150/100 mg daily) and NS5A inhibitor ombitasvir (ABT-267) (25 mg daily) [fig_ref] Table 1: Future perspectives of all-oral treatment for HCV genotype 1 in Asian-Pacific Region [/fig_ref] [bib_ref] Randomized trial of interferon-and ribavirin-free ombitasvir/paritaprevir/ritonavir in treatment-experienced hepatitis C virus-infected patients, Chayama [/bib_ref]. SVR 24 weeks after the end of treatment (SVR24) was high (88.9-100 %) regardless of the paritaprevir dose or treatment duration [bib_ref] Randomized trial of interferon-and ribavirin-free ombitasvir/paritaprevir/ritonavir in treatment-experienced hepatitis C virus-infected patients, Chayama [/bib_ref]. The most common adverse events were nasopharyngitis (29 %) and headache (14 %).

## Paritaprevir/ritonavir, ombitasvir and dasabuvir
The Turquoise-II study (n = 380) consisted of a phase 3 trial for HCV GT-1 patients with Child-Pugh class A cirrhosis with 12 or 24 weeks of the combination of paritaprevir (ABT-450)/ritonavir (150/100 mg daily), ombitasvir (ABT-267) (25 mg daily), NS5B polymerase non-nucleoside inhibitor dasabuvir (ABT-333) (250 mg, twice daily) and ribavirin [fig_ref] Table 1: Future perspectives of all-oral treatment for HCV genotype 1 in Asian-Pacific Region [/fig_ref] [bib_ref] ABT-450/r-ombitasvir and dasabuvir with ribavirin for hepatitis C with cirrhosis, Poordad [/bib_ref]. Treatment for 12 or 24 weeks led to SVR12 in 91.8 % (191/208) or 95.9 % (165/172) patients, respectively. Drug discontinuations due to adverse events were uncommon (2.1 %). The PEARL-III and PEARL-IV studies were conducted via a phase 3 trial for HCV GT-1a (n = 419) or GT-1b (n = 305) patients without cirrhosis, respectively, with a 12-week combination of paritaprevir (ABT-450)/ritonavir (150/100 mg daily), ombitasvir (ABT-267) (25 mg daily), and NS5B polymerase non-nucleoside inhibitor dasabuvir (ABT-333) (250 mg, twice daily), with or without ribavirin [fig_ref] Table 1: Future perspectives of all-oral treatment for HCV genotype 1 in Asian-Pacific Region [/fig_ref] [bib_ref] PEARL-III study; PEARL-IV study. ABT-450/rombitasvir and dasabuvir with or without ribavirin for..., Ferenci [/bib_ref]. The 12-week treatment, with or without ribavirin, led to SVR12 in 97.0 % (97/100) or 90.2 % (185/ 205) of the HCV GT-1a patients, respectively. As for the HCV GT-1b patients, the 12-week treatment, with or without ribavirin, led to SVR12 in 99.5 % (209/210) or 99.0 % (207/209), respectively. Drug discontinuations due to adverse events were rare (0.3 %). The most common adverse events were fatigue, headache and nausea.
SAPPHIRE-II studies were conducted by a phase 3 trial for treatment-experienced HCV GT-1 patients without cirrhosis, respectively, with 12-weeks of the combination of paritaprevir (ABT-450)/ritonavir (150/100 mg daily), ombitasvir (ABT-267) (25 mg daily), and dasabuvir (ABT-333) (250 mg, twice daily) with or without ribavirin, (1000 or 1200 mg daily) (

## Asunaprevir and daclatasvir
After a phase 2 trial [bib_ref] Preliminary study of two antiviral agents for hepatitis C genotype 1, Lok [/bib_ref] , showing that the combination of asunaprevir and daclatasvir was effective only for HCV GT-1b, a Japanese (n = 222) randomized, open-label phase 3 trial for HCV GT-1b patients (135 interferonineligible/intolerant and 87 non-responder patients) with 24 weeks of the combination of NS3/4A inhibitor asunaprevir (100 mg, twice daily) and NS5A inhibitor daclatasvir (60 mg, once daily) was conducted [fig_ref] Table 1: Future perspectives of all-oral treatment for HCV genotype 1 in Asian-Pacific Region [/fig_ref] [bib_ref] Daclatasvir plus asunaprevir for chronic HCV genotype 1b infection, Kumada [/bib_ref]. SVR24 rates were 87.4 % (118/135) or 80.5 % (70/ 87) in interferon-ineligible/intolerant or nonresponder patients, respectively. The most common adverse events were nasopharyngitis, ALT and AST elevations, headache, diarrhea and pyrexia. It was also reported that drug-induced immunoallergic hepatitis occurred during the combination therapy with daclatasvir and asunaprevir [bib_ref] Drug-induced immunoallergic hepatitis during combination therapy with daclatasvir and asunaprevir, Fujii [/bib_ref].
The HALLMARK-DUAL study presented a randomized, open-label phase 3 trial for HCV GT-1b patients (205 treatment-naive, 205 non-responders and 235 ineligible and/or intolerant patients) with the 24-week combination of asunaprevir (100 mg, twice daily) and daclatasvir (60 mg, once daily) [fig_ref] Table 1: Future perspectives of all-oral treatment for HCV genotype 1 in Asian-Pacific Region [/fig_ref] [bib_ref] All-oral daclatasvir plus asunaprevir for hepatitis C virus genotype 1b: a multinational,..., Manns [/bib_ref]. The SVR12 rate was 90 % (182/205), 82 % (168/205), or 82 % (192/235) in treatment-naive, non-responders, or ineligible and/or intolerant patients, respectively. They [bib_ref] All-oral daclatasvir plus asunaprevir for hepatitis C virus genotype 1b: a multinational,..., Manns [/bib_ref] detected RAVs at NS5A-L31, NS5A-Y93 and NS3-D168, or a combination of two or more, in 75 of 596 patients. Of these 75 patients, only 29 (39 %) achieved SVR12. Of note, these RAVs were associated with virological failure.
Asunaprevir and daclatasvir are mainly eliminated through liver. Therefore, this combination therapy for 24 weeks is not contraindicated in patients with severe renal impairment, including HCV GT-1 patients with hemodialysis and was highly effective and well tolerated [bib_ref] Efficacy and safety of daclatasvir and asunaprevir combination therapy in chronic hemodialysis..., Suda [/bib_ref].

## Asunaprevir, daclatasvir and bms-791325
A joint USA/France study (n = 64) performed a randomized, open-label phase 2a trial for treatment-naive HCV GT-1 patients with 12 or 24 weeks of the combination of asunaprevir (200 mg, twice daily), daclatasvir (60 mg, once daily) and BMS-791325 (75 or 150 mg, twice daily) [fig_ref] Table 1: Future perspectives of all-oral treatment for HCV genotype 1 in Asian-Pacific Region [/fig_ref] [bib_ref] Efficacy of an interferon-and ribavirin-free regimen of daclatasvir, asunaprevir, and BMS-791325 in..., Everson [/bib_ref]. SVR12 was achieved in 92 % (61/64) of the patients.

## Grazoprevir (mk-5172) and elbasvir (mk-8742)
Another USA/Europian countries study (n = 253) consisted of a randomized, open-label phase 2 trial for HCV GT-1 patients with cirrhosis, with 12 or 18 weeks of the combination of HCV NS3/4A inhibitor grazoprevir (MK-5172) (100 mg daily) and NS5A inhibitor elbasvir (MK-8742) (50 mg daily), with or without ribavirin [fig_ref] Table 1: Future perspectives of all-oral treatment for HCV genotype 1 in Asian-Pacific Region [/fig_ref] [bib_ref] Efficacy and safety of 12 weeks versus 18 weeks of treatment with..., Lawitz [/bib_ref]. SVR12 was achieved in 90-97 % of the patients. Less than 1 % of grazoprevir and elbasvir are renally excreted. Therefore, this combination therapy for 12 weeks is not contraindicated in GT-1 patients with stage 4-5 chronic kidney disease and was highly effective and well tolerated [bib_ref] Grazoprevir plus elbasvir in treatment-naive and treatment-experienced patients with hepatitis C virus..., Roth [/bib_ref].

## Future perspectives of chronic hcv gt-1 patients in asian countries
There are differences between HCV GT-1a and GT-1b according to the several regimens of all-oral treatment for HCV GT-1. HCV subgenotyping and RAVs at HCV NS5A should be analyzed before the commencement of asunaprevir and daclatasvir combination treatment [bib_ref] HCV NS5A resistance-associated variants in a group of real-world Japanese patients chronically..., Hirotsu [/bib_ref]. However, all-oral treatment can be available to cure almost all HCV GT-1 patients including ''difficult-totreat'' patients [fig_ref] Figure 2: Treatment for HCV genotype-1 in Asian-Pacific region [/fig_ref]. Of course, further studies will be needed.

## #2 consensus statements and recommendation on all-oral treatment for hcv gt-1 infection
1. In treatment-naive patients and previously treated-with peginterferon plus ribavirin patients with chronic HCV GT-1 infection, the following all-oral treatments apply: All-oral treatment for HCV GT-2 and GT-3 infection
[formula] HCV GT-2 [/formula]
In treatment-naive patients with HCV GT-2 infection patients, the all-oral treatment regimen is the combination of sofosbuvir (400 mg per day) with weight-based RBV [1000 mg (\75 kg) to 1200 mg (C75 kg)] for 12 weeks, which produces high SVR rates (. Therefore, extending treatment from 12 to 16 weeks in HCV GT-2-infected patients with cirrhosis is recommended. Daclatasvir (60 mg/day) with sofosbuvir (400 mg/day) for 24 weeks was associated with a high SVR rate (96 %) in treatment-naive patients with HCV GT-2 infection [bib_ref] Daclatasvir plus sofosbuvir for previously treated or untreated chronic HCV infection, Sulkowski [/bib_ref]. Although RBV did not seem to be necessary to achieve SVR, the number of patients was too small to draw any firm conclusions. Ledipasvir (90 mg/day) with sofosbuvir (400 mg/day) for 12 weeks was also associated with high SVR12 rate (96 %) in HCV GT-2 infected patients including treatment-experienced and those with cirrhosis [bib_ref] Ledipasvir/Sofosbuvir single tablet regimen is effective in patients with HCV Genotype 2..., Gane [/bib_ref]. Sofosbuvir in combination with GS-5816 was evaluated in treatment-naive patients with HCV GT-2 infection with high SVR rates [bib_ref] Safety and efficacy of treatment with the interferon-free, ribavirin-free combination of sofosbuvir..., Everson [/bib_ref].

## Hcv gt-3
With current anti-HCV agents, HCV GT-3 is the most difficult-to-cure genotype. The VALENCE study assessed the efficacy and safety of sofosbuvir (400 mg per day) plus weight-based RBV [1000 mg (\75 kg) to 1200 mg (C75 kg)] for 24 weeks [bib_ref] Sofosbuvir and ribavirin in HCV genotypes 2 and 3, Zeuzem [/bib_ref]. This trial included 250 treatment-naive (42 %) and -experienced (58 %) patients with HCV GT-3 infection. The overall SVR12 rate was 84 % and treatment-naive patients had a higher SVR than -experienced ones (93 vs. 77 %, respectively). These data suggest that higher SVR rates can be achieved with a 24-week sofosbuvir plus RBV therapy than those reported with 12-or 16-week therapy in the FISSION [bib_ref] Sofosbuvir for previously untreated chronic hepatitis C infection, Lawitz [/bib_ref] (63 % after 12 weeks), POSITRON [bib_ref] Sofosbuvir for hepatitis C genotype 2 or 3 in patients without treatment..., Jacobson [/bib_ref] , (61 % after 12 weeks) and FUSION [bib_ref] Sofosbuvir for hepatitis C genotype 2 or 3 in patients without treatment..., Jacobson [/bib_ref] (30 % after 12 weeks and 62 % after 16 weeks) trials. The SVR rates were comparable between patients with and without cirrhosis (92 and 93 %, respectively). Recently, the phase III ALLY 3 study using daclatasvir (60 mg per day) plus sofosbuvir (400 mg per day) for 12 weeks [bib_ref] All-oral 12-week combination treatment with daclatasvir (DCV) and sofosbuvir (SOF) in patients..., Nelson [/bib_ref]. The study included 101 treatment-naive patients with HCV genotype 3 infection and showed the SVR rate of 90 %. In treatment-naive patients without cirrhosis (Metavir F0-F3), 97 % achieved SVR, and in treatment-naive patients with cirrhosis (Metavir F4), 58 % achieved SVR.

## #3 consensus statements and recommendation on all-oral treatment for hcv gt-2 and gt-3 infection
In chronic HCV GT-2 or GT-3 infection, the following alloral treatments apply: [bib_ref] All-oral therapy with sofosbuvir plus ribavirin for the treatment of HCV genotypes..., Molina [/bib_ref]. Following the success of [bib_ref] Interferon-free regimens of ombitasvir and ABT-450/r with or without ribavirin in patients..., Pol [/bib_ref]. In vitro, both ledipasvir and daclactasvir are active against both HCV GT-5 and GT-6. However, clinical data related to the use of these NS5A DAAs are limited. The combination of sofosbuvir and ledipasvir, administered 12 weeks without ribavirin in treatmentnaive and treatment-experienced patients infected with HCV GT-6 yielded SVR rate of 96 % (24/25) [bib_ref] High efficacy of LDV/SOF regimens for 12 weeks for patients with HCV..., Gane [/bib_ref].

## Emerging clinical study
Future drug combinations will likely exist of two or more DAAs with the aim to achieve (1) pan-genotypic HCV activity, (2) little or no risk for resistance; (3) short duration (B12 weeks) of treatment, and (4) SVR and definite cure of the disease.
To date, there are limited clinical data to support the use of the combination of 12 weeks of daily sofosbuvir (400 mg) plus simeprevir (150 mg) with or without weight- Recently, Merck has developed the combination of grazoprevir, NS3/4A protease inhibitor that has high potency in vitro against HCV GT-1, GT-2, GT-4, GT-5, and GT-6 and elbasvir, NS5A inhibitor active against GT-1, GT-2a, GT-3, GT-4, GT-5, and GT-6, even in the presence of RAVs associated with failure of other NS5A inhibitors, such as daclatasvir and ledipasvir [bib_ref] Randomized trial of interferon-and ribavirin-free ombitasvir/paritaprevir/ritonavir in treatment-experienced hepatitis C virus-infected patients, Chayama [/bib_ref] [bib_ref] Daclatasvir plus sofosbuvir for previously treated or untreated chronic HCV infection, Sulkowski [/bib_ref]. In the C-EDGE study with oral, once-daily, fixed-dose grazoprevir 100 mg/elbasvir 50 mg for 12 weeks being administered, 18 of 18 (100 %) with HCV GT-4 and 8 (80 %) of 10 with HCV GT-6, achieved SVR [bib_ref] Grazoprevir-Elbasvir combination therapy for treatment-naive cirrhotic and noncirrhotic patients with chronic HCV..., Zeuzem [/bib_ref]. At the time of failure, both patients with HCV GT-6 with virological failure had NS3 resistant associated variants (RAVs), and 1 also had an NS5A RAV [bib_ref] Grazoprevir-Elbasvir combination therapy for treatment-naive cirrhotic and noncirrhotic patients with chronic HCV..., Zeuzem [/bib_ref]. In the pipeline, Gilead Sciences is evaluating the safety and efficacy of an investigational all-oral pan-genotypic regimen containing the nucleotide analog polymerase inhibitor sofosbuvir (SOF) and the investigational NS5A inhibitor velpatasvir (GS-5816) for the treatment of hepatitis C infection across all genotypes. In a phase 2 study, among the 154 previously untreated hepatitis C patients without liver cirrhosis, 9 % had HCV GT-4, a single individual had HCV GT-5 and 6 % had HCV GT-6. About one-third had the favourable IL28B CC gene variant associated with interferon responsiveness. Participants in this openlabel study were randomly assigned to receive 400 mg oncedaily sofosbuvir plus either 25 mg or 100 mg once-daily GS-5816 for 12 weeks. SVR12 rates for GT-4 SVR12 rates were 100 and 86 %, respectively, in the 25 mg and 100 mg dose groups. The single HCV GT-5 patient and all HCV GT-6 patients in both dose arms were cured [bib_ref] Safety and efficacy of treatment with the interferon-free, ribavirin-free combination of sofosbuvir..., Everson [/bib_ref]. So far, sofosbuvir plus velpatasvir (GS-5816) was well tolerated in over 800 patients with HCV infection evaluated. There was a low incidence of serious adverse effects and few discontinuations due to adverse events. The most frequently reported adverse events ([10 %) were fatigue, headache, nausea and insomnia. The most frequently observed hematologic abnormality was hemoglobin decrease in the RBV-containing treatment groups. Further phase 3 studies, ASTRAL-1,-2, -3 and -4, have recently been completed, with all genotypes evaluated with sofosbuvir 400 mg/velpatasvir (VEL, GS-5816) 100 mg FDC tablet administered orally once daily, with and without RBV. Among the 1035 subjects in the ASTRAL-1, -2, and -3 studies, 21 % had compensated cirrhosis and 28 % had failed prior treatments. In ASTRAL-1, SOF/VEL for 12 weeks had similar adverse events compared with placebo and SVR12 was noted in 100 % (116/116) GT-4, 97 % (34/35) GT-5 and 100 % (41/41) GT-6.
Current availability of interferon-free and ribavirin-free regimens have been shown to be remarkably efficacious and well tolerated. However, the long duration of therapy has raised concerns about adherence and cost [bib_ref] Minimum costs for producing hepatitis C direct-acting antivirals for use in large-scale..., Hill [/bib_ref]. Mirroring from the studies in HCV GT-1, one will anticipate the addition of a third potent direct-acting antiviral drug to the current dual therapy can further reduce the duration of treatment required to achieve sustained viral response in patients with chronic HCV GT-1 infection without cirrhosis. In the proof-of-concept study by Kohli et al., the use of three direct-acting drugs with different mechanisms of action in two therapeutic groups from a mono-infected urban population allowed for a shorter duration of treatment (6 weeks) and resulted in high cure rates and excellent tolerability [bib_ref] Virological response after 6 week triple-drug regimens for hepatitis C: a proof-of-concept..., Kohli [/bib_ref]. Furthermore, viral kinetic modeling suggests that the threedrug regimen of sofosbuvir, ledipasvir, and GS-9451-targeting three different stages of the HCV lifecycle-resulted in enhanced HCV clearance compared with other regimens that target only two stages. Further larger studies will be warranted to confirm these findings and to understand the related specific host or viral factors to better refine our clinical management of these patients.

## #4 consensus statements and recommendation on all-oral treatment for hcv gt-4 infection

## Generic licensing of all-orals in pakistan
Pakistan has the second highest burden of chronic HCV infection in the world after China. Prevalence of HCV infection is 5 %, with an estimated 8 million people infected with the virus [bib_ref] Prevalence of hepatitis B and C viral infections in Pakistan: findings of..., Qureshi [/bib_ref]. There are, however, pockets of very high prevalence of up to 24 % of the population [bib_ref] Health care risk factors among women and personal behaviors among men explain..., Janjua [/bib_ref]. The major HCV genotype in Pakistan is GT-3 (90 % cases), followed by GT-1 (10 % cases). The IL28B genotype is favorable in most cases. Both standard interferon and peginterferon have been used for treatment of HCV, in combination with ribavirin, with overall SVR rates of 65 % for standard interferon and around 75 % for peginterefon [bib_ref] Distribution of hepatitis C virus genotypes and its response to treatment in..., Mumtaz [/bib_ref]. However, due to the large disease burden, Pakistan was the second country in the world after Egypt to receive sovaldi through the Gilead global access program at the heavily discounted price of 300 USD per month. The drug was formally registered in March 2015 and till now nearly 20,000 patients have been started on treatment. sovaldi is used either in combination with ribavirin for 24 weeks or with ribavirin and peginterferon for 12 weeks. Initial results suggest SVR rates that are similar to those reported for HCV GT-3, of around 85 %.
A sizeable population of difficult to treat HCV GT-3 patients with prior treatment exposure as well as cirrhosis is emerging, particularly in the tertiary care centers. For these patients, additional DAAs are urgently needed.
New DAA in Egypt: the licensing scenario It seems that, finally, the nightmare of HCV in Egypt will end, as by April 2015, 2 DAA brands, Sofosbuvir, and Semiprevir. as well as 2 generics for Sofosbuvir have been registered and are available in Egypt. Early in 2014, the Egyptian government represented by its Ministry of Health (MOH) and the National Committee for Control of Viral Hepatitis (NCCVH), successfully signed a memorandum of understanding (MoU) with Gilead according to which Gilead accepted to supply its DAA brand, Sofosbuvir, at only 1 % of its price in the USA. This price was close to 300 USD/28 cap box. By March 2015, the Ministry of Health signed a similar MoU with Janssen to supply its brand Simeprevir at a price of 250 USD/box. Simeprevir has recently been added to the national treatment program.
- Other approved treatment options for HCV GT-4 as, LEDIPASVIR/SOFOSBUVIR ''Harvoni'', Daklatasvir and Viekirax [bib_ref] Ledipasvir/sofosbuvir treatment results in high SVR rates in patients with chronic genotype..., Abergel [/bib_ref] will soon be available. It is planned that more than 250,000 patients yearly would receive the new treatment protocols. The same rules will be applied for all patients regardless of the source of payment, and there will be no place for patients' preferences in deciding the treatment regimen. - Treatment in its first phase included only cases with F2, F3, F4, or compensated cirrhosis, excluding cases with decompensation or with HCC patients except after successful radical curative intervention (4 months after resection or successful local ablation) evident by triphasic CT. - The presence of large risky esophageal varices, required prophylactic management before being treatment-eligible. - Age limits for treatment eligibility fixed to be above 18 years and below 70 years for all patients while body mass index (BMI) will be accepted up to 35. - For special population groups; priority for treatment will be offered for post-liver transplantation, postkidney transplantation patients and combined HCV/ HBV infection regardless of the fibrosis stage. Other groups such as pediatric age groups and kidney disease patients will be reviewed following the availability of sufficient data. Patients with documented extra-hepatic manifestations will be prioritized for treatment according to the same guidelines. - Treatment-experienced patients should only start 6 months after cessation of the previous therapy. - No differentiation in treatment priority will be established based on the previous treatment experience. - Sofosbuvir (nucleotide polymerase inhibitor) was introduced in the national treatment program through 2 treatment options:
1. Triple Regimen including peginterferon (a2A and a2B): Sofosbuvir plus peginterferon and ribavirin for 12 weeks 2. Dual Regimen: Sofosbuvir plus RBV for 24 weeks Treatment was designed for those with Fibrosis score F2, F3, F4 and compensated cirrhotics. Recent published reports support this recommended protocol [bib_ref] Sofosbuvir in combination with peginterferon and ribavirin for patients chronically infected with..., Wehmeyer [/bib_ref].
- The increasing number of reports that treatment with the new DAAs are well tolerated and efficacious in patients with decompensated cirrhosis and, more importantly, markers of hepatic and synthetic function improved during the short-term follow-up [bib_ref] all-oral HCV therapy is safe and effective in patients with decompensated cirrhosis:..., Reddy [/bib_ref] [bib_ref] Ledipasvir/sofosbuvir with ribavirin is safe in [600 decompensated and post liver transplantation..., Samuel [/bib_ref] , will be reviewed. The inclusion of these cases in the national program will be considered during the next phases of the national treatment program. - In the new era of the DAAs, in addition to increased treatment efficacy with SVR more than 90 %, by increasing cases detection and reducing new infections, according to a mathematical modeling, the government strategy is to achieve \2 % prevalence by 2025 and [90 % drop in prevalence by 2030 (near-total HCV elimination) [bib_ref] The current and future disease burden of chronic hepatitis C virus infection..., Waked [/bib_ref].
Results of the national program The initial report of the national program was published in June 2015. The report was an interim analysis of efficacy in both treatment groups (dual and triple therapy). The study included 458 patients received dual regimen and 349 received triple regimen. Both groups were evaluated for treatment results at week 12 which is considered the end of treatment for the triple regimen and midpoint of treatment in the dual regimen.

# Results
Detailed results of the analysis are shown in. The overall treatment response at week 12 in both groups was 98.8 % (798/807), ETR in the triple regimen group was 99.1 % (346/349) and in the dual regimen group was 98.3 % (452/458) [bib_ref] Aymen Yousry A, El Akel W, and waked I:(National Committee for Control..., Doss [/bib_ref].

## #6 consensus statements and recommendation on generic licensing of all-orals in egypt
1. In the new era of the DAAs, with the high clearance rate of the HCV and minimal side effects, the dream of global eradication of the virus seems feasible. (A1) 2. The major global obstacle in using these new DDAs is the outstanding very high prices of these drugs exceeding the capabilities of health care systems even in rich developed countries, and consequently the scenario will be harder both in poor as well as in developing countries with low national incomes and financial resources. (B1) 3. In developing countries like Egypt having a high prevalence of HCV infection, in parallel with relatively low health care budgets and resources, the only feasible strategy to eradicate the virus is to establish deals with these new DAAs promising drug-producing companies to supply the drugs at a cheap affordable price for both the government and individuals. (B1)

## Generic licensing of all-orals in indonesia
In Indonesia, chronic hepatitis C infection is dominated by GT-1b. Therefore, the standard of care (SOC) is the combination of peginterferon-alpha 2a or 2b with ribavirin.
Based on a multicenter prospective open-label trial in Indonesia using conventional interferon therapy with ribavirin, it was shown that SVR was 78.3 % in patients with HCV GT-1 and GT-4, and 100 % in non-GT-1 and GT-4 [bib_ref] Efficacy and safety of In-Asia-manufactured Interferon a -2b in combination with Ribavirin..., Akbar [/bib_ref] , whereas in a recent publication based on IL-28B distribution, the 73.5 % SVR was achieved in chronic HCVGT-1 patients with 75.8 % SVR in CC genotype using peginterferon-alpha 2a and ribavirin therapy [bib_ref] Interleukin-28B polymorphisms and response of chronic hepatitis C patients from Indonesia to..., Juniastuti [/bib_ref].

## Daa in indonesia
The only available DAA in Indonesia at this moment is boceprevir which should be used together with peginterferon and ribavirin. Sofosbuvir will soon be available in Indonesia with generic licensing. Since most Indonesian patients are dominated by HCV GT-1, the use of peginterferon will still be the cornerstone of standard therapy. However, the potential for an upcoming new combination of DAA agents with the possibility of generic licensing will give a new standard of care in Indonesia. HCV infection in patients with hepatic decompensation, liver transplant candidates and recipients HCV reinfection after liver transplant is universal and inevitable, and can be the key factor associated with premature graft loss. Treatment of HCV infection is crucial, as successful treatment has the potential to alter the outcomes of decompensated liver disease, liver transplant candidates and in patients with HCV recurrence after transplantation. Previously, interferon-based therapies have not been used in decompensated liver disease due to the high risk of infection and further hepatic decompensation [bib_ref] Antiviral therapy in HCV decompensated cirrhosis: to treat or not to treat, Navasa [/bib_ref]. The outcomes of interferon-based therapy after liver transplantation have been relatively poor compared to interferon-based therapies in the non-transplant situation [bib_ref] Clinical benefits of antiviral therapy in patients with recurrent hepatitis C following..., Berenguer [/bib_ref]. The advent of interferon-free therapies enables successful treatment in liver transplant candidates, patients with hepatic decompensation (proceeding or not to liver transplantation) and patients in the post-transplant situation. on an intention-to-treat basis had no HCV recurrence in the allograft. This paper has established the proof of principle that prolonged viral suppression for [4 weeks pre-transplant with sofosbuvir-based therapy can prevent reinfection of the liver allograft in at least 50 % of patients. b. Decompensated Cirrhosis. There are now several reports (all still in abstract form) using sofosbuvirbased interferon-free antiviral therapy (AVT) in this situation [bib_ref] An interferon-free antiviral regimen for HCV after liver transplantation, Kwo [/bib_ref] [bib_ref] Treatment of decompensated HCV cirrhosis in patients with diverse genotypes: 12 weeks..., Foster [/bib_ref] [bib_ref] Sofosbuvir and ribavirin for the treatment of chronic HCV with cirrhosis and..., Afdhal [/bib_ref] [bib_ref] all-oral HCV therapy is safe and effective in patients with decompensated cirrhosis:..., Reddy [/bib_ref] [bib_ref] The use of simeprevir and sofosbuvir to treat HCV G1 in the..., Bashar [/bib_ref]. These studies mainly on HCV GT-1 report SVR rates for sofosbuvir and ledipsavir of 80-90 % in Child-Pugh Score C patients but this may be as low as 70 % [bib_ref] An interferon-free antiviral regimen for HCV after liver transplantation, Kwo [/bib_ref] [bib_ref] Treatment of decompensated HCV cirrhosis in patients with diverse genotypes: 12 weeks..., Foster [/bib_ref] [bib_ref] Sofosbuvir and ribavirin for the treatment of chronic HCV with cirrhosis and..., Afdhal [/bib_ref] [bib_ref] all-oral HCV therapy is safe and effective in patients with decompensated cirrhosis:..., Reddy [/bib_ref] [bib_ref] The use of simeprevir and sofosbuvir to treat HCV G1 in the..., Bashar [/bib_ref]. In these studies, an improvement of [2 in MELD scores was seen in 40-50 % of patients but worsened in about 5-10 %. In an open label study of simeprevir and sofosbuvir in HCV GT-1 patients, a similar SVR (approximately 80 %) was seen. However, simeprevir drug levels may have a significantly increased area under the curve in decompensated diseases and is generally not recommended. In one study of HCV GT-3 patients, sofosbuvir plus daclatasvir resulted in a SVR of 70 versus 60 % versus sofosbuvir plus ledipasvir [bib_ref] Sofosbuvir and ribavirin for the treatment of chronic HCV with cirrhosis and..., Afdhal [/bib_ref]. It remains unclear whether ribavarin results in an increased SVR in these patients using such regimes. It seems that HCV GT-2 patients may have similar response rates using sofosbuvir and ribavirin. c. Treating post-liver transplant HCV recurrence. A study of treatment of mild hepatitis C allograft infection with an AbbVie 3D regimen (ritonavir boosted paritaprevir, ombitasvir and dabuvir) in HCV GT-1 infection led to a 90 % SVR rate [bib_ref] Sofosbuvir and ribavirin for treatment of compensated recurrent hepatitis C virus infection..., Charlton [/bib_ref]. Similar SVR rates have been seen in sofosbuvir and ledipasvir therapy including some patients with more advanced disease [bib_ref] Ledipasvir/sofosbuvir with ribavirin for the treatment of HCV in patients with post-transplant..., Reddy [/bib_ref] [bib_ref] Safety and efficacy of sofosbuvir-containing regimens for hepatitis C: real-world experience in..., Jensen [/bib_ref] [bib_ref] Safety and efficacy of new DAA-based therapy for hepatitis C post-transplant: interval..., Brown [/bib_ref] [bib_ref] On-treatment virologic response and tolerability of simeprevir, daclatasvir and ribavirin in patients..., Forns [/bib_ref] [bib_ref] Sofosbuvir compassionate use program for patients with severe recurrent hepatitis C after..., Forns [/bib_ref]. Studies with sofosbuvir-based therapies in the post-transplant population in very severe liver disease such as cholestatic hepatitis C have led to 60-70 % SVR rates, but in such studies there was a mortality of approximately 13 % due to advanced disease [bib_ref] High rates of virological response and major clinical improvement during sofosbuvir and..., Leroy [/bib_ref] [bib_ref] The association of sofosbuvir and daclatasvir for treating severe recurrence of HCV..., Coilly [/bib_ref]. Ribavirin should be added on the sofosbuvir-based therapies and the duration of the regimens should be 24 weeks in patients with decompensated liver disease or in HCV GT-3 patients of post-transplant patients [bib_ref] Ledipasvir and sofosbuvir plus ribavirin for treatment of HCV infection in patients..., Charlton [/bib_ref].
In conclusion there seem to be limitations to the outcomes from antiviral therapy particularly in decompensated liver disease. Current data suggest that interferon-free AVT will prevent HCV allograft reinfection in a significant number of patients. However, many patients with severe portal hypertension and ascites may continue to have hepatic decompensation and severe portal hypertension despite achieving SVR, and thus will still require liver transplantation. It is not clear what parameters exist that are determining successful reversible portal hypertension or not. Furthermore, sofosbuvir-based therapies have not been studied extensively in patients with renal dysfunction which is not an uncommon problem in advanced liver disease. (Sofosbuvir is currently contraindicated in patients with creatinine clearance rates of less than 30 mL/min.) Thus, sofosbuvir-based regimes may not be a viable option in patients with very high MELD scores who have overt or incipient renal failure.
#8 Consensus statements and recommendation on decompensated liver disease Comorbidities of HCV infection and chronic kidney disease (CKD) might present in two ways: HCV infection during maintenance dialysis and HCV-associated kidney disease. These disorders can occur both in native kidneys and in renal allografts. Therefore, all patients with kidney diseases should be evaluated for possible underlying HCV infection. It is suggested that HCV-infected patients be tested at least annually for proteinuria and hematuria. The prevalence of HCV increases with the time that CKD patients are on dialysis which suggests that nosocomial transmission may be the route of infection in previously uninfected dialysis patients [bib_ref] Patterns of hepatitis C prevalence and seroconversion in hemodialysis units from three..., Fissel [/bib_ref]. Sensitive quantitative RT-PCR tests for HCV should be administered to hemodialysis patients with unexplained abnormal aminotransferase(s) levels. Patients with end-stage renal disease (ESRD) have lower serum ALT levels than the general population; thus, some studies suggest that the optimized cut-off ALT level be approximately 0.4-0.45 times the upper limit of normal for HCV-infected patients [bib_ref] APASL consensus statements and management algorithms for hepatitis C virus infection, Omata [/bib_ref] [bib_ref] Asian-Pacific Association for the Study of the Liver consensus statements on the..., Asian-Pacific ; Mccaughan [/bib_ref] [bib_ref] Impact of hepatitis C virus infection and other comorbidities on survival in..., Butt [/bib_ref]. Cirrhosis, Asian race and history of alcohol abuse are associated with the highest risks for the development of HCC among dialysis patients with HCV infection [bib_ref] Hepatitis C progressing to hepatocellular carcinoma: the HCV dialysis patient in dilemma, Henderson [/bib_ref]. Even after adjusting for concurrent comorbidities, HCV infection is associated with higher risk of liver-related mortality in these subgroups of HCV-infected patients. Furthermore, HCV infection decreases the healthrelated quality of life in dialysis patients.
Currently, DAA-based therapies offer the best outcomes in patients with chronic kidney disease (CKD) who have mild to moderate renal impairment, i.e., creatinine clearance (CCr) from 30 mL/min to 80 mL/min. The standard dose of sofosbuvir, fixed-dose combination of sofosbuvir/ ledipasvir, simeprevir, fixed-dose combination of paritaprevir/ritonavir/ombitasvir plus dasabuvir have demonstrated good efficacy in CKD. Simeprevir was also used safely at standard dose for patients with severe renal impairment, i.e., CCr \ 30 mL/min. In many countries in Asia, the access to new DAAs is limited and variable, and thus the combination peginterferon-alpha and ribavirin may still be the standard of care available for HCV infection in many CKD patients with normal, mild, moderate, or severe decrease in the glomerular filtration rate (GFR), and even in those with kidney failure. For interferon-based treatment regimens, please refer to the 2012 edition of this clinical practice guidelines for further verification [bib_ref] APASL consensus statements and management algorithms for hepatitis C virus infection, Omata [/bib_ref].
[formula] #11 [/formula]

## Svr for hcv co-infection with hiv
Hepatitis C has a limited impact on HIV disease progression. Conversely, HIV alters the natural history of hepatitis C in several important areas [bib_ref] Asian-Pacific Association for the Study of the Liver consensus statements on the..., Asian-Pacific ; Mccaughan [/bib_ref]. A rapid progression of liver fibrosis and increased mortality after decompensation has been observed in HCV/HIV co-infected patients [bib_ref] HIV co-infection shortens the survival of patients with hepatitis C virus-related decompensated..., Pineda [/bib_ref] [bib_ref] Risk of liver decompensation among HIV/hepatitis C virus-co-infected individuals with advanced fibrosis:..., Macias [/bib_ref] [bib_ref] Risk of liver decompensation assessed in HIV/HCV coinfected individuals with advanced liver..., Alves [/bib_ref]. HCV/HIV co-infected individuals should be offered treatment or re-treatment like any other individual without HIV infection, regardless of their stage of fibrosis at diagnosis [bib_ref] Virologic response following combined ledipasvir and sofosbuvir administration in patients with HCV..., Osinusi [/bib_ref] [bib_ref] Treatment of chronic hepatitis C in patients with HCV/HIV co-infection, Coppola [/bib_ref] [bib_ref] Management of HCV in cirrhosis-a rapidly evolving landscape, Sharma [/bib_ref].
Second generation DAA-based therapies have demonstrated high efficacy and safety in treatment-naive, treatment experienced and cirrhotic HCV patients co-infected with HIV. Please refer to the ''PAN-oral therapy for HCV GT-4, GT-5 and GT-6 infection'' section for this guideline's recommended DAA-based regimens for HCV infection. However, caution should be exercised when using such agents due to known drug-drug interactions with antiretroviral agents. A close collaboration with HIV specialist is recommended when treating HCV/HIV co-infected individuals.
While current western guidelines do not favor peginterferon/ribavirin-based therapies any more, in Asia, many of the second-generation DDAs are not yet available and thus combination peginterferon and ribavirin is still the standard of care. Data from previous studies have indicated that SVR achieved with this regimen reduces liver-related complications and mortality in HCV/HIV co-infected patients [bib_ref] Relationship of liver disease stage and antiviral therapy with liver-related events and..., Limketkai [/bib_ref] [bib_ref] Benefits from sustained virologic response to pegylated interferon plus ribavirin in HIV/hepatitis..., Mira [/bib_ref]. Predictors of treatment response with peginterferon/ribavirin therapy are factors largely related to HCV: rapid virologic response (RVR), HCV genotype, HCV viral load, IL28B gene variation, and liver disease stage, however, the SVR rates in HIV/HCV co-infected patients are 15-20 % lower than those in patients with HCV mono-infection. Likewise, rates of hepatic decompensation during peginterferon/ribavirin treatment are considerably higher in co-infected patients than in HCV mono-infected patients, especially among cirrhotics [bib_ref] Asian-Pacific Association for the Study of the Liver consensus statements on the..., Asian-Pacific ; Mccaughan [/bib_ref] [bib_ref] Baseline serum hepatitis C virus (HCV) RNA level and response at week..., Nunez [/bib_ref] [bib_ref] Undetectable hepatitis C virus RNA at week 4 as predictor of sustained..., Martin-Carbonero [/bib_ref] [bib_ref] Prediction of response to pegylated interferon plus ribavirin by IL28B gene variation..., Pineda [/bib_ref] [bib_ref] Interleukin-28B polymorphisms are associated with hepatitis C virus clearance and viral load..., Clausen [/bib_ref] [bib_ref] Association of a single nucleotide polymorphism near the interleukin-28B gene with response..., Rallon [/bib_ref]. For interferon-based treatment regimens, please refer to the previous report for further verification [bib_ref] APASL consensus statements and management algorithms for hepatitis C virus infection, Omata [/bib_ref].
#12 Consensus statements and recommendation on HCV and HIV co-infection

## Svr for hcv co-infection with hbv
If HCV is determined to be replicating and is the dominant driver of liver inflammation in HCV/HBV co-infection, coinfected patients should be treated with similar regimens like those with HCV monoifection. When serum HBV DNA levels are elevated at any time before, during and after HCV treatment, nucleos(t)ide analogues may be added to current HCV therapy. Peginterferon may be an option. Please refer to the recommendations in the 2012 guidelines [bib_ref] APASL consensus statements and management algorithms for hepatitis C virus infection, Omata [/bib_ref]. Similar SVR rates are achieved with HCV genotype-guided peginterferon/ribavirin therapy in HCV mono-infected versus HCV/HBV co-infected patients [bib_ref] Peginterferon alfa-2a plus ribavirin for the treatment of dual chronic infection with..., Liu [/bib_ref]. HBsAg seroclearance is also observed in co-infected patients treated with peginterferon/ribavirin [bib_ref] Late hepatitis B virus relapse in patients co-infected with hepatitis B virus..., Potthoff [/bib_ref] [bib_ref] Long-term effect of interferon plus ribavirin on hepatitis B surface antigen seroclearance..., Yeh [/bib_ref] [bib_ref] HBsAg profiles in patients receiving peginterferon alfa-2a plus ribavirin for the treatment..., Yu [/bib_ref]. Some of the newly-approved DAAs for HCV treatment have demonstrable drug-drug interactions with nucleos(t)ide analogues which may limit or preclude their combined use in the HCV/HBV co-infected patients. In patients who achieved SVR, long-term follow-up and monitoring for relapse of HBV infection is recommended. In conclusion, we have reviewed the recent advances of interferon-free therapies for the patients with chronic HCV infection in Asian-Pacific countries. A summary is shown in. In the near future, HCV treatment will be further evolved to achieve much higher SVR rates and much shorter treatment duration.
Hepatol Int (2016) 10:702-726 719
[fig] #1: Consensus statements and recommendation on interferon supersensitive group 1. For the countries in which direct acting antiviral agents are not available, or only have limited resources, peginterferon and ribavirin combination therapy may be considered in chronic HCV GT-1, GT-4, or GT-6 treatment-naive patients with low viral load and favorable IL28B genotypes and in HCV GT-2 or GT-3 treatment-naive patients. (A1) 2. For the treatment-experienced patients, the peginterferon and ribavirin combination therapy can only be considered in relapsers with favorable IL28B genotype and non-cirrhotic patients. (B2) [/fig]
[fig] Figure 1: Sustained virological response (SVR) rates (%) of daily ledipasvir (LDV) and sofosbuvir (SOF). a Treatment-naive patients with HCV genotype 1, b Treatment-experienced patients with [/fig]
[fig] Figure 2: Treatment for HCV genotype-1 in Asian-Pacific region [/fig]
[fig] 1: All the patients with decompensated liver disease can be treated with interferon-free-based therapies. Emerging data suggest that sofosbuvir-based treatment plus or minus ledipasvir (HCV GT-1) or daclastasvir (HCV GT-3) may be effective in this setting. Patients should be treated for a period of 12-24 weeks. Anticipated SVR rates at between 70 and 90 %. (B1)#9 Consensus statements and recommendation on awaiting liver transplant 1. All patients awaiting liver transplantation can be treated as above with interferon-free antiviral therapy (sofosbuvir-based treatment plus or minus ledipasvir (HCV GT-1) or daclastasvir (HCV GT-3) for a minimum of 3 months before liver transplantation to prevent allograft recurrence. If viral clearance persists for [4 weeks even on-treatment, allograft re-infection is very likely to be prevented.(A1). It remains unclear how many patients improve MELD and CTP scores that allow removal from waiting lists. Thus, interferonfree therapy may best be introduced post-transplant rather than pre-transplant in patients with very high MELD scores. (C1)#10 Consensus statements and recommendation on following liver transplant 1. Following liver transplantation recurrent HCV infection should be treated with interferon-free based therapies for 3 months. It is reasonable to commence therapy between 1 and 3 months post-transplant. These regimens may include sofosbuvir and ledipasvir or daclatasvir and the Abbvie 3D regime (ritonavirboosted paritaprevir, ombitasvir and dabuvir) for mild disease. If the latter is used, dose adjustments (signif-icantreductions) of cyclopsorin and tacrolimus are required. For more severe disease, evidence exists for sofosbuvir-based therapy in the combination of ledipasvir (GT-1) or daclatasvir (GT-3). (B1) 2. With the introduction of universal antiviral treatment post-transplant, the issues of immunosuppression should not be different in this population than in other liver transplant populations, although immunosuppressive drug doses may need adjustment depending on the regime used. (C2) SVR for renal failure and co-infection with HBV/ HIV SVR for HCV infection in patients with renal failure [/fig]
[table] Table 2: This regimen has been evaluated in 4 clinical trials (ELECTRON, FISSION, POSI-TRON, and VALENCE)[68][69][70][71]. The FISSION study randomized patients to receive daily peginterferon and RBV (800 mg) for 24 weeks or sofosbuvir plus daily weight-based RBV [1000 mg (\75 kg) to 1200 mg (C75 kg)] for 12 weeks[70]. The SVR rate was higher (94 %) in patients who received sofosbuvir plus RBV than in those who received peginterferon and RBV (78 %; 52/67). Across all 3 trials[68,70,71], 201 (94 %) of the 214 patients with HCV GT-2 infection achieved SVR with sofosbuvir plus RBV. Among those who did not achieve SVR, sofosbuvir resistance-associated variants (RAVs) were not detected. Based on the results of these trials, both the FDA and EMA approved sofosbuvir and RBV for 12 weeks in all HCV GT-2 treatment-naive [/table]
[table] Table 8: Interferon-free treatment for patients infected with HCV various genotypes (GTs) Grading TN/TE-PR TE-NS3/4A inhibitor TE-NS5A inhibitor A1 SOF/RBV for 12 weeks SOF/RBV for 12 weeks SOF/RBV for 12 weeks SOF/RBV for 12 weeks [/table]