Figures
Abstract
Rationale and Aims
Screening and treatment for chronic hepatitis C are very limited in Vietnam and clinical data on HCV-related liver disease in HIV-coinfected people are almost inexistent. This study aimed to assess the severity of liver fibrosis and its risk factors in HIV-HCV coinfected patients in Haiphong, Northern Vietnam.
Methods
A cross-sectional study was conducted at a HIV outpatient clinic. Consecutive HIV treated adults with positive HCV serology completed a standardised epidemiological questionnaire and had a comprehensive liver assessment including hepatic elastography (Fibroscan®, Echosens).
Results
From February to March 2014, 104 HIV-HCV coinfected patients receiving antiretroviral therapy (ART) were prospectively enrolled (99 males, median age: 35.8 (32.7–39.6) years, median CD4 count: 504 (361–624) /mm3. Of them, 93 (89.4%) had detectable HCV RNA (median 6.19 (4.95–6.83 Log10 IU/mL). Patients were mainly infected with genotypes 1a/1b (69%) and genotypes 6a/6e (26%). Forty-three patients (41.3%) had fibrosis ≥F2 including 24 patients (23.1%) with extensive fibrosis (F3) and/or cirrhosis (F4). In univariate analysis, excessive alcohol consumption, estimated time duration from HCV infection, nevirapine and lopinavir-based ARV regimen and CD4 nadir were associated factors of extensive fibrosis/cirrhosis. Alcohol abuse was the only independent factor of extensive fibrosis in multivariate analysis. Using Fibroscan® as a gold standard, the high thresholds of AST-to-platelet ratio index (APRI) and fibrosis-4 score (FIB-4) had very good performances for the diagnosis of extensive fibrosis/cirrhosis (Se: 90 and 100%, Sp:84 and 81%, AUROCs = 0.93, 95%CI: 0.86–0.99 and 0.96 (0.92–0.99), respectively).
Citation: Nguyen Truong T, Laureillard D, Lacombe K, Duong Thi H, Pham Thi Hanh P, Truong Thi Xuan L, et al. (2016) High Proportion of HIV-HCV Coinfected Patients with Advanced Liver Fibrosis Requiring Hepatitis C Treatment in Haiphong, Northern Vietnam (ANRS 12262). PLoS ONE 11(5): e0153744. https://doi.org/10.1371/journal.pone.0153744
Editor: Isabelle A. Chemin, CRCL-INSERM, FRANCE
Received: December 2, 2015; Accepted: April 4, 2016; Published: May 5, 2016
Copyright: © 2016 Nguyen Truong et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Data Availability: The data cannot be publicly available due to legal and ethical restrictions from the French Authority (Commission nationale de l'informatique et des libertés). However, requests for data use can be made to a representative from the Agence nationale de recherche sur le sida et les hépatites virales (ANRS): Claire Rekacewicz is the person to contact at claire.rekacewicz@anrs.fr.
Funding: This study was funded by the French Research Agency on HIV/AIDS and Viral Hepatitis (ANRS 12262).
Competing interests: The authors have declared that no competing interests exist.
Introduction
Over the last decade, access to HIV/AIDS care and antiretroviral therapy (ART) has been greatly improved in resource-limited countries and the number of AIDS-related deaths is now steadily decreasing [1]. Hepatitis C virus (HCV) infection, which is a major public health problem globally [2] is frequently observed in HIV-infected individuals and has emerged as a leading cause of morbidity and mortality in this population [3].
In Vietnam, HCV seroprevalence has been reported between 1 to 6% of the general population [4] and is dramatically higher (up to 90%) in people who inject drug (PWID) [4–10]. The HIV epidemic is concentrated among high risk populations, such as female sex workers (prevalence 2.6%), men who have sex with men (3.7%) and PWID (10.3%) [11]. Despite huge efforts to control the national HIV epidemic among PWID by scaling up ART, needle & syringe exchange programmes and opioid substitution treatment, PWID still represent the vast majority of people living with HIV/AIDS in Vietnam with a high rate of HCV coinfection.
The Vietnamese Ministry of Health has recently developed national HCV Guidelines upon the release of the first World Health Organization (WHO) Guidelines on HCV care and treatment [2]. However screening and access to care and treatment for chronic hepatitis C in Vietnam are still very limited. To date, no clinical data on HCV-related liver disease are available in people living with HIV/AIDS in Vietnam and therefore the proportion of patients in need of treatment is unknown. Since new highly effective direct antiviral agents DAAs will soon be recommended by WHO as preferred options for treatment globally and are increasingly recommended by national guidelines and some of them have now become available at generic price, access to these drugs in resource-constrained areas has been urged by the medical community and the civil society [12–15].
Therefore, it is critical to identify patients in need of urgent treatment in developing countries, which bear the highest burden of HCV-related liver disease.
The following cross-sectional study aimed to assess the proportion of clinically significant fibrosis (≥F2) in HIV-HCV-coinfected patients followed in Viet Tiep Hospital in Haiphong, Northern Vietnam. We also identified epidemiological, virological and clinical characteristics associated with extensive fibrosis/cirrhosis. Since WHO [2] ranked the aspartate transaminase (AST)-to-platelet ratio index (APRI) and Fibrosis-4 score (FIB-4) as preferred non-invasive markers of fibrosis in resource-limited settings, we also evaluated the diagnostic performances of these tests in our HIV-HCV coinfected population using hepatic transient elastography (Fibroscan®) as a gold standard.
Patients and Methods
Study population
Among the 1,184 HIV-infected patients (including 1,173 (99%) under ART) who are regularly followed up in the outpatient clinic (OPC) of Viet Tiep hospital in Haiphong, we prospectively enrolled consecutive HIV-infected patients under ART with a HCV positive rapid test (SD Bioline anti-HCV rapid test (Standard Diagnostics Inc., Korea), who visited the clinic for their regular HIV follow-up between February and March 2014. As the ultimate goal of this study was to identify and characterize patients who may benefit from HCV treatment (only peg-interferon and ribavirine have been registered as HCV antiviral therapy in Vietnam), eligibility criteria for this cross-sectional study were: being over 18 years old, HCV treatment-naïve, under ART for more than 6 months with CD4 ≥ 200/mm3 and having no contra-indications to immediate interferon-based HCV treatment i.e: ongoing opportunistic infection, concomitant malignancy, severe anemia defined by Hb<8 g/dL, decompensated cirrhosis, acute heart failure, severe psychiatric disorders, pregnancy, platelet count <50,000/mm3, neutrophil count <750/mL measured in the past 6 months. Only participants with a confirmed positive HCV serology were included in the final analysis.
The study, its protocol and the written consent procedure were approved by the Ethic Committee of the Viet Tiep Hospital and the Institutional Review Board (IRB) of the Haiphong Medical Services (permit number 01BVVT/HDKH). Before enrollment in the following study, all participants provided written consents which have been kept at the ANRS site in Vietnam as recommended by the IRB. The study was carried out in strict accordance with the recommendations of the Haiphong healthcare services and the Helsinki declaration.
Clinical assessment
Each participant was administrated a face-to-face standardized socio-demographic questionnaire in Vietnamese, had a clinical examination and a comprehensive liver assessment by a trained medical doctor. Heavy alcohol consumption was defined as a daily consumption over 50 g per day. HCV duration was estimated as “time from HCV diagnosis” defined by the duration between the discovery of HCV infection (defined by positive HCV antibody) and the time of enrolment in our study.
Liver fibrosis was assessed using transient elastography (Fibroscan 402, Echosens, France) by two trained experienced operators (TNT, DL) according to the manufacturer’s protocol [16]. The value of liver stiffness measurement (LSM) was expressed in kilopascal (kPa) as the median of 10 successful acquisitions. Unreliable measurement was defined as interquartile range (IQR)/LSM of>0.30 when LSM is ≥7.1 kPa according to Boursier et al. criteria [17]. LSM were all done fasting as recommended [18, 19]. The following cut-offs were used to stage the liver fibrosis: fibrosis F0-F1<7.1 kPa; F2: 7.1–9.4 kPa; F3: 9.5–12.4 kPa, F4> 12.4 kPa [20].
Laboratory investigations
The following blood parameters were determined after overnight fasting in the laboratory of Viet Tiep hospital on the same day as transient elastography in all patients: AST, alanine aminotransferase (ALT), gamma-glutamyltransferase (GGT), total bilirubin, platelet count, serum albumin and prothrombin time. All participants had a confirmatory test for HCV serology by Enzyme-linked Immunosorbent essay (ELISA) technique using Phamatech anti HCV EIA kit (USA). The plasma was prepared and stored at -20°C in Viet Tiep Hospital then transferred to Pasteur Institute in Ho Chi Minh City for HIV and HCV RNA quantification and HCV genotyping. HIV and HCV RNA were extracted from plasma samples using MagNa Pure 96 system kit on the LightCycler® 480 instrument (Roche, USA). HIV viral load was measured by HIV RNA levels (Generic HIV Viral Load®, Biocentric, France) with a detection limit of 300 copies/mL [21]. HCV RNA was quantified by HCV Real-time Quant kit (Sacace Biotechnologies, Italy) with a detection limit of 15 IU/mL.
HCV genotyping was performed for samples with HCV RNA level above 1,000 copies/mL. An in-house assay was applied in which a targeting of 377 bp HCV NS5b region or 464 bp core gene was amplified by ABI 9700 PCR instrument and sequenced by CEQ 8000 Genetic Analysis System (Beckman Coulter). HCV subtypes were identified using the Los Alamos Hepatitis C sequence (www.hcv.lanl.gov).
Statistical analysis
All data were registered anonymously in a computerized database. The description of socio-demographical, clinical, biochemical, hematological, virological and immunological parameters was performed using standard descriptive methods, i.e. categorical variables were expressed as raw numbers and percentages, continuous variables were described by their means and standard deviation (normal distribution) or their median and IQR 25–75% (non normal distribution assessed by Shapiro-Wilks test). The proportion of F3-F4 fibrosis was assessed as the number of patients with LSM above 9.4kPa and expressed with its 95% confidence interval. Mean (+/- standard derivation (SD)) score was also determined and used as a continuous variable. As transient elastography has been shown to predict portal hypertension in chronic liver disease [22] and LSM values above 20 and 40 kPa have been proved to be associated with a high risk of portal hypertension and cirrhosis-related complications, respectively [20], we also reported the number of patients with LSM >20 kPa and >40 kPa. Categorical variables were compared using a Pearson v2-test or Fisher’s Exact Test as appropriate, and continuous variables were compared using a Student’s t test or non-parametric tests as appropriate. A two-sided P value <0.05 was considered statistically significant. The diagnostic performances of APRI and FIB-4 in diagnosing advanced fibrosis(F3)/cirrhosis were evaluated from the Area Under the ROC curves (AUROCs), considering transient elastography as the gold standard. Two thresholds for fibrosis ≥ F4 with APRI were examined: 2 (high threshold) and 1 (low threshold), as per WHO hepatitis C Guidelines [2]. Likewise, two thresholds for fibrosis ≥ F3 with FIB-4 were examined: 3.25 (high threshold) and 1.25 (low threshold). The degree of correlation between both biochemical scores and result of elastometry was also explored using Spearman correlation test. Finally, risk factors for liver fibrosis ≥F3 were assessed by means of two methods: i) outcome expressed as a dichotomous variable (< or ≥ F2): univariate and multivariate logistic regression with odds ratios (OR) and 95% confidence intervals; ii) outcome expressed as a continuous variable (LSM): univariate and multivariate linear regression with β parameters and 95% confidence intervals (CI). Statistical analyses were performed using STATA 11 statistical package for Windows.
Results
Study population
Out of the 1,184 HIV patients who are regularly followed up in the OPC of the Viet Tiep hospital, 1,158 (97.8%) had a systematic screening for HBs antigen and HCV antibody and 390 (33.7%) had a positive HCV test. Of the 390 patients tested positive for HCV antibody, 200 (51.3%) were eligible for the following study. Of these 200 patients, 111 consecutive HIV and HCV co-infected adults were enrolled from February to March 2014 (Fig 1).
However, seven had a negative HCV confirmatory serological test and were excluded from further assessment. Therefore, the study population consisted of 104 patients, whose demographic, clinical and biological characteristics are summarized in Tables 1 and 2.
Continuous variables are expressed with their median and interquartile range (IQR) for the general population and mean and standard deviation (SD) when categorized by liver fibrosis group.
Study participants were mainly men (95.2%) with a median age of 35.8 (32.7–39.6) years. At enrolment, they were all under ART (most prescribed 3rd agent: efavirenz with a backbone of TDF/3TC or D4T/3TC or AZT/3TC), with 94.2% rate of undetectable HIV-RNA and a median CD4 cell count of 504 (361–624) /mm3. The median duration from HIV diagnosis was 6.3 (3.1–7.8) years.
Of the 104 study participants, 72 (69.2%) reported past injection drug use while 24 (33%) were still injecting drugs and 21 (20.2%) were receiving opiate substitution treatment. Current or past excessive alcohol consumption was reported in 70 (67.3%) patients. The prevalence of positive HBs antigen (HBsAg) was 12.6% (95% CI: 10.4–14.8). All of the 13 HBV-infected patients except one had undetectable HBV DNA.
Hepatitis C and liver fibrosis evaluation.
Among the 104 patients with confirmed HCV antibodies, 93 (89.4%) had a positive HCV RNA with a median viral load of 6.19 (4.95–6.83 Log10 IU/mL). Genotype distribution showed a highest proportion of genotypes 1 (64 (68.8%), genotype 1a and 1b: 42 (45.2%) and 22 (23.7%), respectively),followed by genotype 6 (24 (25.8%), genotype 6a and 6b: 19 (20.4%) and 5 (5.4%), respectively) and genotype 3b (5 (5.4%)). A valid LSM was obtained for all the subjects: median LSM 6.7 kPa (5.3–9.2). According to the predetermined cut-offs for liver fibrosis, 61 (68.7%) patients were classified as having no or mild fibrosis (F1),19 (18.3%) as having clinically significant fibrosis (F2), 10 (9.6%) as having extensive fibrosis (F3) and 14 (13.5%) as having cirrhosis (F4). All cirrhotic subjects had compensated liver disease and 2 were classified Child-Pugh score B. Of the 14 cirrhotic patients, 8 (57%) had LSM over 20 kPa suggesting clinically significant portal hypertension and 2 (14%) had LSM over 40 kPa, a cut-off associated with high risk of cirrhosis-related complications.
Patients with extensive fibrosis/cirrhosis had lower platelet count (P = 0.003) and lower prothrombin time (p<0.0001), and higher ALT, AST, GGT and total bilirubin levels, (P<0.0001) compared to patients with none to moderate fibrosis. A higher rate of alcohol consumption and a trend towards longer time from HCV diagnosis were also noted in patients with severe fibrosis (83.3% versus 62.5% P = 0.04 and 9 years versus 4.6 years P = 0.08, respectively). The proportion of patients with severe fibrosis was similar across HCV genotype (Table 2).
Risk factors for advanced fibrosis/cirrhosis.
In univariate analysis with fibrosis as a dichotomous variable (F0-F2 versus F3-F4), the following factors were associated with extensive fibrosis/cirrhosis: current or past excessive alcohol consumption, HCV time from diagnosis, nevirapine or lopinavir-based ART regimen and CD4 nadir. After adjustment, the only factor remaining associated with F3-F4 score was current or past excessive alcohol consumption (OR: 4.2, 95% CI: 1.1–15.4). In multivariate analysis with transient elastography as a continuous variable, heavy alcohol consumption remained strongly associated with high LSM values (β = 36.04 (3.95–68.13), p<0.03)
Performance of APRI and FIB-4 scores for the diagnosis of advanced fibrosis/cirrhosis.
The correlation between APRI and elastography scores was good (rho = 0,49, P<0,0001) and very good for FIB-4 and elastography (rho = 0,72, P<0,0001). For the diagnosis of advanced fibrosis/cirrhosis, the performance of APRI (high threshold at 2) was very good (Fig 2A and Table 3) with an AUROC at 0.93 (95% IC, 0.86–0.99) and 87 (84%) of the patients were correctly classified. Using the low APRI threshold at 1, AUROC was only 0.75 (95% IC, 0.64–0.86) (Fig 2B and less patients (78, 75%) were correctly classified. Using the high cut-off APRI score allowed maximising the sensitivity of the score (90%) while keeping the same level of specificity (84%) (Table 3). The same calculations were applied to FIB-4: for the diagnosis of advanced fibrosis (F3), the performance of FIB-4 (high threshold at 3.25) was very good (Fig 3A and Table 3) with an AUROC at 0.96 (95% IC, 0.92–0.99) and 85 (82%) of the patients were correctly classified. Using the low FIB-4 threshold at 1.25, AUROC was only 0.76 (95% IC 0.64–0.88) (Fig 3B) and less patients (82.79%) were correctly classified (Table 3)
Abbreviations: AUROC: area under the receiving operator curve; Se: sensitivity; Sp: specificity; LR-: negative likelihood ratio; LR+: positive likelihood ratio.
Discussion
Our study suggests that among HIV-HCV coinfected subjects under ART who are attending the outpatient clinic in Haiphong, Northern Vietnam, almost half of them have clinically significant fibrosis (≥F2) including one fourth with extensive fibrosis or cirrhosis despite optimal HIV viro-immunological control. We confirm that genotypes 1 and 6 are the predominant HCV genotypes circulating among this group but in different proportions than in Hai Phong and other regions of Vietnam.
Few studies on HCV infection have been conducted in Vietnam. These studies were mainly sero-epidemiological surveys without clinical evaluation of the liver disease [9, 23, 24]. In Southeast Asia, only one study from Thailand assessed the degree of liver fibrosis in 130 HIV-HCV co-infected individuals [25]. This study reported 41.7% of HIV-HCV coinfected patients with extensive fibrosis F3/F4 using Fibroscan®. Out of them 24% were classified as cirrhotics. Cross-sectional studies conducted in Western countries also reported high proportions of extensive fibrosis and cirrhosis in cohorts of HCV naïve of treatment HIV-HCV coinfected subjects [26–29]. The higher rates of extensive fibrosis observed in the Thai and Western studies compared to our results may be explained by the differences in age (our patients were much younger) and estimated time from HCV infection. The median duration of HCV exposure was over 17 years in the Thai study and the Western studies as compared to an estimated median HCV contamination below seven years in our study.
Interestingly, the short period from HCV diagnosis (4.8 (2.7–6.5) years) suggests that HCV infection was long neglected in Vietnam, as systematic HCV screening has been implemented only in 2005 in HIV clinics.
Haiphong city experiences important rates of injection drug use in young individuals [30]. Indeed, it is a well-established area within the “Golden Triangle” for heroin supply at low price and has become an attractive area for PWID [30]. In our study, as expected the use of injecting drugs was frequently associated with HCV infection among HIV positive patients and HCV transmission was attributable to the use of intravenous drug in almost two third of the cases. This is in line with other studies from Vietnam, and other Asian countries that reported a high prevalence of HCV infection, up to 96% in injecting drug users [9, 10, 31]. In Hanoi, among HIV-infected individuals, 35.4% were tested positive for HCV and HIV-HCV coinfection was mainly observed in young males. In this study, the use of injecting drug was reported as a transmission factor in 44% of cases [23].
As suggested by previous studies, we confirm that genotypes 1 and 6 are the most frequent circulating genotypes in Vietnam [32, 33]. However, genotype 6 was not the predominant circulating genotype in our study population although previous studies reported a higher prevalence of HCV genotype 6 in Vietnam [32, 33].
While Avihingsanon et al. observed a lower rate of severe fibrosis in HCV genotype 6-infected subjects in Thailand, we did not find any difference in fibrosis stage according to genotype.
We assessed the severity of liver fibrosis using Fibroscan® as its excellent performances have been demonstrated in HCV-infected as well as HIV-HCV co-infected individuals [20, 34, 35]. In addition, liver biopsy is not feasible in routine clinical practice in resource-limited countries. However, the Fibroscan® device is rarely available in these countries mainly because of its high cost (€34,000 for the portable machine and €5,000 for the annual maintenance cost). In Vietnam only a few machines are available in the country and are mainly accessible in the private sector. As a result the WHO recommends the use of APRI or FIB-4 as simple and inexpensive alternative methods to identify patients with extensive fibrosis and cirrhosis in resource-constrained countries [2]. Using Fibroscan® as a gold standard, we found that APRI and FIB-4 performed very well in diagnosing extensive fibrosis/cirrhosis (AUROC>0.90) when using the high thresholds of 2 for APRI and 3.25 for FIB-4.
Since international guidelines recommend to prioritize treatment in patients with extensive fibrosis or cirrhosis [36], we focused our analysis on F3-F4 patients. A recent model-based analysis performed in resource-limited countries (Egypt, Thailand, Côte d’Ivoire) also suggested that focusing HCV treatment on patients with severe fibrosis (F3–F4) using standard of care therapy (Peg-interferon and ribavirin) or interferon-free therapy (sofosbuvir and ribavirin), is the best strategy for developing countries as it provides the highest number of life per year saved [37]. Several studies have also shown that HCV antiviral therapy in IDUs, especially in those on opioid substitution treatment, is associated to identical sustained virological response compared to non-or former IDUs [38, 39]. In addition, there is an increase evidence to propose HCV therapy as a cost-effective intervention to reduce the burden of HCV infection and transmission in this specific population [40, 41].
Our study clearly suggests that a high proportion of IDUs in Vietnam urgently requires HCV antiviral therapy. Based on our analysis and considering that there is 200,000 IDUs in Vietnam, about 150,000 of them (70%) have been infected with HCV, 80% of them (120,000) have a chronic HCV hepatitis and at least 30,000 could be pre-cirrhotic or cirrhotic with a risk of hepatic decompensation or HCC over the next years if they do not benefit of antiviral treatment soon.
Interestingly, almost all our study participants (95%) had a good HIV viro-immunological control. This reflects the great efforts that have been deployed over the last decades in Vietnam to fight against HIV/AIDS and expand ART also to the most stigmatized populations. Thus, if access to HCV treatment is not improved, the benefits of ART on mortality will be clearly undermined.
In our study, heavy alcohol consumption was the only statistical difference between patients with extensive fibrosis or cirrhosis and those with none to moderate fibrosis. It was also a strong independent factor of severe fibrosis. By contrast with other studies, age, estimated duration of HIV or HCV infection and ARV regimen were not statistically associated with extensive liver fibrosis/cirrhosis although a trend was noted for the HCV duration. This underlines that excessive alcohol consumption is an important contributor of liver fibrosis progression in this population. Heavy alcohol consumption has been previously reported as a major public health problem in Vietnam in particular in men [4, 42]. Unfortunately, alcohol is another neglected problem in many resource-limited countries and must be clearly integrated in harm reduction programmes [2].
Our study has some limitations. First, it is a cross-sectional study including a small number of patients, with a reduced statistical power to assess risk factors, which may not strictly reflect the burden of HCV-related burden disease in HIV-HCV individuals in Vietnam. Secondly, since the most severe cases have been seen mainly in inpatient clinic, our study may have underestimated the proportion of patients with end-stage liver disease. Thirdly, we assessed the diagnostic performances of biochemical markers of fibrosis using transient elastography as a gold standard although we could not validate its performances against liver biopsy in our study population. However, excellent performances of Fibroscan in predicting liver fibrosis in Asian HCV subjects have been previously reported using liver histology as a gold standard [43]. Finally, we could not properly assess the proportion of patients with liver complications (in particular portal hypertension) due to resource-limited constraints.
Our findings underline the urgent need of HCV “screen and treat” intervention programmes in Vietnam. Among HIV-HCV coinfected subjects successfully treated with ART, our study suggests that about 25% of patients urgently require HCV antiviral therapy. This underlines the necessity to rapidly expand access to HCV treatments adapted to the local epidemiology (genotypes 1 & 6). This will comply with the recent WHO recommendations [2] and its urgent call to deploy strategies to reduce the burden of viral hepatitis especially in endemic resource-constrained areas [44] and eventually eliminate the epidemic globally [45].
Acknowledgments
We would like to thank all the participants, Prof. Hoang Van Mich (director of Viet Tiep Hospital), the entire team of the HIV outpatient clinic and Dr Catherine Quillet for supporting the data management of the study. We are really grateful to Echosens France, in particular Jean-Marc David and Céline Fournier, for offering the Fibroscan® machine. We also thank the French national research agency on HIV and viral hepatitis (ANRS) and its director Prof. Jean-François Delfraissy. Finally we want to acknowledge Prof. Françoise Barre-Sinoussi, the French coordinator of the ANRS Vietnam site, for her strong support.
Author Contributions
Conceived and designed the experiments: ML DL TNT KL SD HDT LTTX. Analyzed the data: KL ML ET TNT DL. Contributed reagents/materials/analysis tools: ML TNT DL KL HDT PPTH LTTX NCT ALQ VVH NN ET SD. Wrote the paper: ML KL DL TNT NN ET. Contributed to the study and approved the final version of the manuscript: ML TNT DL KL HDT PPTH LTTX NCT ALQ VVH NN ET SD.
References
- 1.
UNAIDS. http://www.unaids.org/en/media/unaids/contentassets/documents/epidemiology/2013/gr2013/UNAIDS_Global_Report_2013_en.pdf Last accessed 3rd of June 2014. 2013.
- 2.
WHO;. Guidelines for the screening, care and treatment of persons with hepatitis C infection http://whoint/hiv/pub/hepatitis/hepatitis-c-guidelines/en/ Accessed 18t March 2015. 2014.
- 3. Joshi D O'Grady J, Dieterich D, Gazzard B, Agarwal K. Increasing burden of liver disease in patients with HIV infection. Lancet. 2011;377(9772):1198–209. pmid:21459211.
- 4. Gish RG, Bui TD, Nguyen CT, Nguyen DT, Tran HV, Tran DM, et al. Liver disease in Viet Nam: screening, surveillance, management and education: a 5-year plan and call to action. Journal of gastroenterology and hepatology. 2012;27(2):238–47. pmid:22098550.
- 5.
Viet nam HIV/AIDS ESTIMATES AND PROJECTIONS 2007–2012. MINISTRY OF HEALTH–VIET NAM ADMINISTRATION OF HIV/AIDS CONTROL.
- 6. Kallman JB, Tran S, Arsalla A, Haddad D, Stepanova M, Fang Y, et al. Vietnamese community screening for hepatitis B virus and hepatitis C virus. Journal of viral hepatitis. 2011;18(1):70–6. pmid:20196807.
- 7. Sereno L, Mesquita F, Kato M, Jacka D, Nguyen TT, Nguyen TN. Epidemiology, responses, and way forward: the silent epidemic of viral hepatitis and HIV coinfection in Vietnam. J Int Assoc Physicians AIDS Care (Chic). 2012;11(5):311–20. Epub 2012/07/26. pmid:22828983.
- 8. Clatts MC, Colón-López V, Giang LM, Goldsamt LA. Prevalence and Incidence of HCV Infection among Vietnam Heroin Users with Recent Onset of Injection. Journal of Urban Health: Bulletin of the New York Academy of Medicine 2009;87(2).
- 9. Quan VM, Go VF, Nam le V, Bergenstrom A, Thuoc NP, Zenilman J, et al. Risks for HIV, HBV, and HCV infections among male injection drug users in northern Vietnam: a case-control study. AIDS Care. 2009;21(1):7–16. pmid:19085215.
- 10. Zhang L, Celentano DD, Le Minh N, Latkin CA, Mehta SH, Frangakis C, et al. Prevalence and correlates of HCV monoinfection and HIV and HCV coinfection among persons who inject drugs in Vietnam. European journal of gastroenterology & hepatology. 2015;27(5):550–6. pmid:25769097; PubMed Central PMCID: PMC4380662.
- 11.
Vietnam AIDS response progress report 2014. National committee for AIDS, drugs and prostitution prevention and control. Hanoi.
- 12. Ford N, Singh K, Cooke GS, Mills EJ, von Schoen-Angerer T, Kamarulzaman A, et al. Expanding access to treatment for hepatitis C in resource-limited settings: lessons from HIV/AIDS. Clinical infectious diseases: an official publication of the Infectious Diseases Society of America. 2012;54(10):1465–72. Epub 2012/03/21. doi: cis227 [pii] pmid:22431808.
- 13. Lemoine M, Thursz M. Hepatitis C, a global issue: access to care and new therapeutic and preventive approaches in resource-constrained areas. Seminars in liver disease. 2014;34(1):89–97. Epub 2014/05/02. pmid:24782262.
- 14. Jayasekera CR, Barry M, Roberts LR, Nguyen MH. Treating hepatitis C in lower-income countries. The New England journal of medicine. 2014;370(20):1869–71. pmid:24720680.
- 15. Lemoine M, Thursz M, Njie R, Dusheiko G. Forgotten, not neglected: viral hepatitis in resource-limited settings, recall for action. Liver international: official journal of the International Association for the Study of the Liver. 2014;34(1):12–5. Epub 2013/09/04. pmid:23998284.
- 16. Sandrin L, Fourquet B, Hasquenoph JM, Yon S, Fournier C, Mal F, et al. Transient elastography: a new noninvasive method for assessment of hepatic fibrosis. Ultrasound Med Biol. 2003;29(12):1705–13. Epub 2003/12/31. pmid:14698338.
- 17. Boursier J, Zarski JP, de Ledinghen V, Rousselet MC, Sturm N, Lebail B, et al. Determination of reliability criteria for liver stiffness evaluation by transient elastography. Hepatology. 2013;57(3):1182–91. pmid:22899556.
- 18. Arena U, Lupsor Platon M, Stasi C, Moscarella S, Assarat A, Bedogni G, et al. Liver stiffness is influenced by a standardized meal in patients with chronic hepatitis C virus at different stages of fibrotic evolution. Hepatology. 2013;58(1):65–72. Epub 2013/03/01. pmid:23447459.
- 19. Lemoine M, Shimakawa Y, Njie R, Njai HF, Nayagam S, Khalil M, et al. Food intake increases liver stiffness measurements and hampers reliable values in patients with chronic hepatitis B and healthy controls: the PROLIFICA experience in The Gambia. Alimentary pharmacology & therapeutics. 2014;39(2):188–96. Epub 2013/12/07. pmid:24308698.
- 20. Castera L, Vergniol J, Foucher J, Le Bail B, Chanteloup E, Haaser M, et al. Prospective comparison of transient elastography, Fibrotest, APRI, and liver biopsy for the assessment of fibrosis in chronic hepatitis C. Gastroenterology. 2005;128(2):343–50. Epub 2005/02/03. pmid:15685546.
- 21. Nacro B, Zoure E, Hien H, Tamboura H, Rouet F, Ouiminga A, et al. Pharmacology and immuno-virologic efficacy of once-a-day HAART in African HIV-infected children: ANRS 12103 phase II trial. Bulletin of the World Health Organization. 2011;89(6):451–8. pmid:21673861; PubMed Central PMCID: PMC3099551.
- 22. Shi KQ, Fan YC, Pan ZZ, Lin XF, Liu WY, Chen YP, et al. Transient elastography: a meta-analysis of diagnostic accuracy in evaluation of portal hypertension in chronic liver disease. Liver international: official journal of the International Association for the Study of the Liver. 2013;33(1):62–71. pmid:22973991.
- 23. Huy BV, Vernavong K, Kinh NV. HBV and HCV Coinfection among HIV/AIDS Patients in the National Hospital of Tropical Diseases, Vietnam. AIDS research and treatment. 2014;2014:581021. pmid:25580287; PubMed Central PMCID: PMC4274838.
- 24. Ye S, Pang L, Wang X, Liu Z. Epidemiological implications of HIV-hepatitis C co-infection in South and Southeast Asia. Current HIV/AIDS reports. 2014;11(2):128–33. pmid:24682917.
- 25. Avihingsanon A, Jitmitraparp S, Tangkijvanich P, Ramautarsing RA, Apornpong T, Jirajariyavej S, et al. Advanced liver fibrosis by transient elastography, fibrosis 4, and alanine aminotransferase/platelet ratio index among Asian hepatitis C with and without human immunodeficiency virus infection: role of vitamin D levels. Journal of gastroenterology and hepatology. 2014;29(9):1706–14. pmid:24730732.
- 26. Carton JA, Collazos J, de la Fuente B, Garcia-Alcalde ML, Suarez-Zarracina T, Rodriguez-Guardado A, et al. Factors associated with liver fibrosis in intravenous drug users coinfected with HIV and HCV. Antiviral therapy. 2011;16(1):27–35. pmid:21311106.
- 27. Kirk GD, Astemborski J, Mehta SH, Spoler C, Fisher C, Allen D, et al. Assessment of liver fibrosis by transient elastography in persons with hepatitis C virus infection or HIV-hepatitis C virus coinfection. Clinical infectious diseases: an official publication of the Infectious Diseases Society of America. 2009;48(7):963–72. pmid:19236273.
- 28. Macias J, Recio E, Vispo E, Rivero A, Lopez-Cortes LF, Rios MJ, et al. Application of transient elastometry to differentiate mild from moderate to severe liver fibrosis in HIV/HCV co-infected patients. Journal of hepatology. 2008;49(6):916–22. pmid:18929426.
- 29. Cacoub P, Carrat F, Bedossa P, Lambert J, Penaranda G, Perronne C, et al. Comparison of non-invasive liver fibrosis biomarkers in HIV/HCV co-infected patients: the fibrovic study—ANRS HC02. Journal of hepatology. 2008;48(5):765–73. pmid:18314219.
- 30. Ahmed T, Long TN, Huong PT, Stewart DE. Drug injecting and HIV risk among injecting drug users in Hai Phong, Vietnam: a qualitative analysis. BMC public health. 2015;15:32. pmid:25631330; PubMed Central PMCID: PMC4324409.
- 31. Solomon SS, Mehta SH, Srikrishnan AK, Solomon S, McFall AM, Laeyendecker O, et al. Burden of hepatitis C virus disease and access to hepatitis C virus services in people who inject drugs in India: a cross-sectional study. The Lancet Infectious diseases. 2015;15(1):36–45. pmid:25486851.
- 32. Pham DA, Leuangwutiwong P, Jittmittraphap A, Luplertlop N, Bach HK, Akkarathamrongsin S, et al. High prevalence of Hepatitis C virus genotype 6 in Vietnam. Asian Pac J Allergy Immunol. 2009;27(2–3):153–60. pmid:19839502.
- 33. Tanimoto T, Nguyen HC, Ishizaki A, Chung PT, Hoang TT, Nguyen VT, et al. Multiple routes of hepatitis C virus transmission among injection drug users in Hai Phong, Northern Vietnam. Journal of medical virology. 2010;82(8):1355–63. pmid:20572071.
- 34. Tsochatzis EA, Gurusamy KS, Ntaoula S, Cholongitas E, Davidson BR, Burroughs AK. Elastography for the diagnosis of severity of fibrosis in chronic liver disease: a meta-analysis of diagnostic accuracy. Journal of hepatology. 2011;54(4):650–9. pmid:21146892.
- 35. de Ledinghen V, Douvin C, Kettaneh A, Ziol M, Roulot D, Marcellin P, et al. Diagnosis of hepatic fibrosis and cirrhosis by transient elastography in HIV/hepatitis C virus-coinfected patients. J Acquir Immune Defic Syndr. 2006;41(2):175–9. pmid:16394849.
- 36. European Association for Study of L. EASL Clinical Practice Guidelines: management of hepatitis C virus infection. Journal of hepatology. 2014;60(2):392–420. pmid:24331294.
- 37. Obach D, Yazdanpanah Y, Esmat G, Avihingsanon A, Dewedar S, Durier N, et al. How to optimize HCV treatment impact on life years saved in resource-constrained countries. Hepatology. 2015. pmid:25581111.
- 38. Bruggmann P, Falcato L, Dober S, Helbling B, Keiser O, Negro F, et al. Active intravenous drug use during chronic hepatitis C therapy does not reduce sustained virological response rates in adherent patients. Journal of viral hepatitis. 2008;15(10):747–52. pmid:18637072.
- 39. Schulte B, Schutt S, Brack J, Isernhagen K, Deibler P, Dilg C, et al. Successful treatment of chronic hepatitis C virus infection in severely opioid-dependent patients under heroin maintenance. Drug and alcohol dependence. 2010;109(1–3):248–51. pmid:20167441.
- 40. Martin NK, Foster GR, Vilar J, Ryder S, Cramp ME, Gordon F, et al. HCV treatment rates and sustained viral response among people who inject drugs in seven UK sites: real world results and modelling of treatment impact. Journal of viral hepatitis. 2015;22(4):399–408. pmid:25288193; PubMed Central PMCID: PMC4409099.
- 41. Hellard ME, Jenkinson R, Higgs P, Stoove MA, Sacks-Davis R, Gold J, et al. Modelling antiviral treatment to prevent hepatitis C infection among people who inject drugs in Victoria, Australia. The Medical journal of Australia. 2012;196(10):638–41. pmid:22676879.
- 42. Huu Bich T, Thi Quynh Nga P, Ngoc Quang L, Van Minh H, Ng N, Juvekar S, et al. Patterns of alcohol consumption in diverse rural populations in the Asian region. Global health action. 2009;2. pmid:20027253; PubMed Central PMCID: PMC2785538.
- 43. Wang JH, Changchien CS, Hung CH, Eng HL, Tung WC, Kee KM, et al. FibroScan and ultrasonography in the prediction of hepatic fibrosis in patients with chronic viral hepatitis. Journal of gastroenterology. 2009;44(5):439–46. Epub 2009/03/25. pmid:19308312.
- 44.
World Health Organization, Global Hepatitis Programme, Global partners. http://www.who.int/hiv/mediacentre/news/hep_calltoaction_new.pdf Last accessed 10 July 2015. 2014.
- 45. Hagan LM, Schinazi RF. Best strategies for global HCV eradication. Liver international: official journal of the International Association for the Study of the Liver. 2013;33 Suppl 1:68–79. Epub 2013/01/11. pmid:23286849.