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Preston R, Christmass M, Lim E, McGough S, Heslop K. Diagnostic Overshadowing of Chronic Hepatitis C in People With Mental Health Conditions Who Inject Drugs: A Scoping Review. Int J Ment Health Nurs 2024. [PMID: 39101240 DOI: 10.1111/inm.13396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2024] [Revised: 06/28/2024] [Accepted: 07/01/2024] [Indexed: 08/06/2024]
Abstract
Diagnostic overshadowing refers to a phenomenon whereby people with mental health conditions encounter inadequate or delayed medical attention and misdiagnosis. This occurs when physical symptoms are mistakenly attributed to their mental health condition. This paper presents a scoping review focusing on direct causes and background factors of diagnostic overshadowing in the context of hepatitis C infection in people who inject drugs and have concurrent mental health conditions. Despite significant strides in hepatitis C treatment with direct-acting antiviral drugs, the complex interplay of mental health conditions and physical symptoms necessitates a nuanced approach for accurate diagnosis and effective screening. This review was conducted using Joanna Briggs Institute's methodology for scoping reviews. The databases searched included Medline, Embase, PsycInfo, Global Health, CINAHL and Scopus. This review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR). The search strategies identified 1995 records. Overall, 166 studies were excluded. Forty-two (42) studies met the inclusion criteria. Three (n = 3) studies represented direct causes, and 39 (n = 39) with background factors related to diagnostic overshadowing. Studies highlighted six key themes encompassing diagnostic overshadowing, with communication barriers, stigma and knowledge deficiencies being the most prominent. Recognising and addressing diagnostic overshadowing in chronic hepatitis C will lead to increased screening, diagnosis and timely administration of life-saving antiviral therapy, resulting in profound enhancements in well-being and health outcomes. Moreover, this proactive approach will play a pivotal role in advancing the global effort towards eliminating hepatitis C by 2030.
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Affiliation(s)
- Regan Preston
- Curtin School of Nursing, Faculty of Health Sciences, Curtin University, Bentley, Western Australia, Australia
| | - Michael Christmass
- Curtin Medical School, Faculty of Health Sciences, Curtin University, Bentley, Western Australia, Australia
| | - Eric Lim
- Curtin School of Nursing, Faculty of Health Sciences, Curtin University, Bentley, Western Australia, Australia
| | - Shirley McGough
- Curtin School of Nursing, Faculty of Health Sciences, Curtin University, Bentley, Western Australia, Australia
| | - Karen Heslop
- Curtin School of Nursing, Faculty of Health Sciences, Curtin University, Bentley, Western Australia, Australia
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Yin X, Kong L, Du P, Jung J. Effects of direct-acting antiviral treatment on reducing mortality among Medicare beneficiaries with HIV and HCV coinfection. AIDS Care 2022; 34:1330-1337. [PMID: 34581640 PMCID: PMC8958183 DOI: 10.1080/09540121.2021.1981221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 09/13/2021] [Indexed: 01/26/2023]
Abstract
Hepatitis C virus (HCV) infection is common among people living with HIV. HIV and HCV coinfected patients have higher overall mortality rates compared with HIV mono-infected patients. With its high cure rate of HCV infection, direct-acting antiviral (DAA) treatment provides an opportunity to improve the survival of the HIV/HCV coinfected population. The objective of this study is to investigate the association between DAA treatment and all-cause mortality among HIV/HCV coinfected people. The study included 7103 Medicare beneficiaries in the United States who were infected with both HIV and HCV between 2014 and 2017. Cox proportional hazards regression model was used to estimate adjusted hazard ratios (aHRs) of death for patients with and without DAA treatment while controlling for patient characteristics. During the study period, 1675 patients initiated DAA treatment (23.6%). The adjusted hazard ratio (aHR) of all-cause mortality between patients with and without DAA treatment was 0.37 (95% CI, 0.29-0.48), regardless of cirrhosis status. DAA treatment was associated with a smaller reduction in all-cause mortality for females (aHR, 0.50 [95% CI, 0.30-0.85]) compared with males (aHR, 0.34 [95% CI, 0.25-0.46]). DAA treatment was associated with improved survival among all HIV/HCV coinfected patients regardless of sex or HCV disease progression.
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Affiliation(s)
- Xin Yin
- Department of Public Health Sciences, College of Medicine, The Pennsylvania State University, Hershey
| | - Lan Kong
- Department of Public Health Sciences, College of Medicine, The Pennsylvania State University, Hershey
| | - Ping Du
- Department of Medicine, College of Health and Human Development, The Pennsylvania State University, University Park
| | - Jeah Jung
- Department of Health Policy and Administration, College of Health and Human Development, The Pennsylvania State University, University Park
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J Minhas H, Akiyama MJ, Norton BL, Heo M, Arnsten JH, Litwin AH. HIV And HCV adherence and treatment outcomes among people who inject drugs receiving opioid agonist therapy. AIDS Care 2022; 34:1229-1233. [PMID: 34533062 PMCID: PMC8926929 DOI: 10.1080/09540121.2021.1973659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 08/09/2021] [Indexed: 01/26/2023]
Abstract
Among people who inject drugs (PWID), 60% have HCV and 50-90% of HIV-infected PWID are co-infected with HCV. Data comparing adherence to direct-acting antiviral (DAA) therapy among HCV mono-infected and HIV/HCV co-infected PWID is limited. The impact of HCV treatment initiation on HIV antiretroviral therapy (ART) adherence is also poorly understood. We assessed DAA adherence in HCV mono-infected and HIV/HCV co-infected PWID and examined changes in ART adherence and HIV outcomes following HCV treatment. Study was conducted in three Medication for Opioid use Disorder (MOUD) programs in Bronx, New York. HCV treatment adherence was measured using electronic blister packs. 2-week DAA adherence rates were compared and controlled for study arm, psychiatric illness and alcohol intoxication within the past 30 days. ART adherence was measured using participant self-report and dichotomized to "excellent" or "other". ART adherence, CD4 count, and HIV viral load were identified six months prior to, during, and six months after HCV treatment. Statistical significance was assessed with mixed-effects regression linear or logistic models. Overall DAA adherence rates among HCV mono-infected and HIV/HCV co-infected PWID were 74% (95% CI=71-78%) and 76% (95%CI=70-83%), respectively (p=.55). There were no significant changes in ART adherence, CD4 counts, or HIV viral loads prior to, during, or after HCV treatment. This is the first study assessing the impact of DAA therapy on ART adherence and HIV treatment outcomes among PWID. It is one of the first to compare DAA adherence among HCV and HIV/HCV co-infected PWID. Our data demonstrate no significant difference in DAA adherence and no significant impact of HCV treatment on ART adherence or HIV outcomes.
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Affiliation(s)
- Hadi J Minhas
- Department of Medicine, Albany Medical Center/Albany Medical College, Albany, NY, USA
| | - Matthew J Akiyama
- Department of Medicine, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA
| | - Brianna L Norton
- Department of Medicine, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA
| | - Moonseong Heo
- Department of Public Health Sciences, College of Behavioral, Social and Health Sciences, Clemson University, Clemson, SC, USA
| | - Julia H Arnsten
- Department of Medicine, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA
| | - Alain H Litwin
- University of South Carolina School of Medicine - Greenville, Greenville, SC, USA
- Clemson University, Clemson, SC, USA
- Prisma Health, Greenville, SC, USA
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Du P, Jung J, Kalidindi Y, Farrow K, Riley T, Whitener C. Low Utilization of Direct-Acting Antiviral Agents in a Large National Cohort of HIV and HCV Coinfected Medicare Patients in the United States: Implications for HCV Elimination. JOURNAL OF PUBLIC HEALTH MANAGEMENT AND PRACTICE 2022; 28:130-134. [PMID: 32011599 PMCID: PMC7391052 DOI: 10.1097/phh.0000000000001147] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Hepatitis C virus (HCV) infection is common in people living with HIV/AIDS (PLWHA). The advent of direct-acting antiviral agents (DAAs) has made HCV elimination a realistic goal. We conducted a retrospective cohort study using the US Medicare Fee-For-Service claims data and outpatient prescription drug data to assess the HCV DAA initiation and completion among newly diagnosed HIV-HCV-coinfected Medicare patients enrolled in 2014-2016. DAA initiation was defined as filling at least 1 prescription of DAAs during 2014-2016. DAA completion was defined as taking an 8-week or longer DAA treatment course for patients without cirrhosis and a 12-week or longer treatment duration for those with cirrhosis. Among 12 152 HIV-HCV-coinfected Medicare patients, 20.9% received the DAA treatment in 2014-2016. The average time from HCV diagnosis to DAA initiation was 277 days. The overall DAA completion rate was 92% among 2537 patients who used DAAs. Interventions are needed to improve DAA uptake in PLWHA.
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Affiliation(s)
- Ping Du
- Department of Medicine, College of Medicine, The Pennsylvania State University, Hershey, United States
- Department of Public Health Sciences, College of Medicine, The Pennsylvania State University, Hershey, United States
| | - Jeah Jung
- Department of Health Policy and Administration, College of Health and Human Development, The Pennsylvania State University, University Park, United States
| | - Yamini Kalidindi
- Department of Health Policy and Administration, College of Health and Human Development, The Pennsylvania State University, University Park, United States
| | - Kevin Farrow
- Department of Pharmacy, Milton S. Hershey Medical Center, The Pennsylvania State University, Hershey, United States
| | - Thomas Riley
- Department of Medicine, College of Medicine, The Pennsylvania State University, Hershey, United States
| | - Cynthia Whitener
- Department of Medicine, College of Medicine, The Pennsylvania State University, Hershey, United States
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Ober AJ, Takada S, Zajdman D, Todd I, Horwich T, Anderson A, Wali S, Ladapo JA. Factors affecting statin uptake among people living with HIV: primary care provider perspectives. BMC FAMILY PRACTICE 2021; 22:215. [PMID: 34717560 PMCID: PMC8556944 DOI: 10.1186/s12875-021-01563-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 10/05/2021] [Indexed: 11/23/2022]
Abstract
BACKGROUND Cardiovascular disease (CVD) is a major cause of morbidity and mortality among people living with HIV (PLWH), but statin therapy, safe and effective for PLWH, is under-prescribed. This study examined clinic leadership and provider perceptions of factors associated with statin prescribing for PLWH receiving care in eight community health clinics across Los Angeles, California. METHODS We conducted semi-structured telephone interviews with clinic leadership and providers across community health clinics participating in a larger study (INSPIRE) aimed at improving statin prescribing through education and feedback. Clinics included federally qualified health centers (N = 5), community clinics (N = 1) and county-run ambulatory care clinics (N = 2). Leadership and providers enrolled in INSPIRE (N = 39) were invited to participate in an interview. We used the Consolidated Framework for Implementation Research (CFIR) to structure our interview guide and analysis. We used standard qualitative content analysis methods to identify themes within CFIR categories; we also assessed current CVD risk assessment and statin-prescribing practices. RESULTS Participants were clinic leaders (n = 6), primary care physicians with and without an HIV specialization (N = 6, N = 6, respectively), infectious diseases specialists (N = 12), nurse practitioners, physician assistants and registered nurses (N = 7). Ninety-five percent of providers from INSPIRE participated in an interview. We found that CVD risk assessment for PLWH is standard practice but that there is variation in risk assessment practices and that providers are unsure whether or how to adjust the risk threshold to account for HIV. Time, clinic and patient priorities impede ability to conduct CVD risk assessment with PLWH. CONCLUSIONS Providers desire more data and standard practice guidance on prescribing statins for PLWH, including estimates of the effect of HIV on CVD, how to adjust the CVD risk threshold to account for HIV, which statins are best for people on antiretroviral therapy and on shared decision-making around prescribing statins to PLWH. While CVD risk assessment and statin prescribing fits within the mission and workflow of primary care, clinics may need to emphasize CVD risk assessment and statins as priorities in order to improve uptake.
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Affiliation(s)
| | - Sae Takada
- RAND Corporation, Santa Monica, CA, USA
- Division of General Internal Medicine and Health Services Research, Department of Medicine, UCLA Geffen School of Medicine, Los Angeles, CA, USA
| | | | - Ivy Todd
- RAND Corporation, Santa Monica, CA, USA
| | - Tamara Horwich
- Division of Cardiology, Department of Medicine, UCLA Geffen School of Medicine, Los Angeles, CA, USA
| | - Abraelle Anderson
- Division of General Internal Medicine and Health Services Research, Department of Medicine, UCLA Geffen School of Medicine, Los Angeles, CA, USA
| | - Soma Wali
- Olive View - UCLA Medical Center, Sylmar, CA, USA
| | - Joseph A Ladapo
- Division of General Internal Medicine and Health Services Research, Department of Medicine, UCLA Geffen School of Medicine, Los Angeles, CA, USA
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Heard E, Smirnov A, Massi L, Selvey LA. Personal, provider and system level barriers and enablers for hepatitis C treatment in the era of direct-acting antivirals: Experiences of patients who inject drugs accessing treatment in general practice settings in Australia. J Subst Abuse Treat 2021; 127:108460. [PMID: 34134878 DOI: 10.1016/j.jsat.2021.108460] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 04/23/2021] [Accepted: 05/04/2021] [Indexed: 12/28/2022]
Abstract
Direct acting antiviral (DAA) treatment has made the elimination of hepatitis C virus (HCV) a realisable global public health goal and people who inject drugs are a key target population. This study investigates barriers and enablers to DAA treatment of HCV in general practice settings in Australia, from the patient perspective. Semi-structured interviews were conducted with 28 patients; of these patients, seventeen participants were currently on opioid agonist therapy, and four were currently injecting drugs. Thematic data analysis was undertaken and a personal, provider and systems framework was used to describe the barriers and enablers to DAA treatment. Results suggest a range of initiatives are required to support the uptake of DAA in general practice settings. These include the provision of formalised peer information and support, and increasing the accessibility of blood tests and liver assessment on-site. Further, there remains a need to address stigma and discrimination affecting people who inject drugs in community healthcare settings.
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Affiliation(s)
- Emma Heard
- School of Public Health, The University of Queensland, 288 Herston Road, Herston 4006, QLD, Australia.
| | - Andrew Smirnov
- School of Public Health, The University of Queensland, 288 Herston Road, Herston 4006, QLD, Australia.
| | - Luciana Massi
- School of Public Health, The University of Queensland, 288 Herston Road, Herston 4006, QLD, Australia.
| | - Linda A Selvey
- School of Public Health, The University of Queensland, 288 Herston Road, Herston 4006, QLD, Australia.
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Predictors of progression through the cascade of care to a cure for hepatitis C patients using decision trees and random forests. Comput Biol Med 2021; 134:104461. [PMID: 33975209 DOI: 10.1016/j.compbiomed.2021.104461] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 04/23/2021] [Accepted: 04/28/2021] [Indexed: 01/15/2023]
Abstract
BACKGROUND This study uses machine learning techniques to identify sociodemographic and clinical predictors of progression through the hepatitis C (HCV) cascade of care for patients in the 1945-1965 birth cohort in the Southern United States. METHODS We compared sociodemographic and clinical variables between groups of patients for three care outcomes: linkage to care, initiation of antiviral treatment, and virologic cure. A decision tree model and random forest model were built for each outcome. RESULTS Patients were primarily male, African American/Black or Caucasian/White, non-Hispanic or Latino, and insured. The average age at first HCV screening was 60 years old, and common medical diagnoses included chronic kidney disease, fibrosis and/or cirrhosis, transplanted liver, diabetes mellitus, and liver cell carcinoma. Variables used in predicting linkage to care included age at first HCV screening, insurance at first HCV screening, race, fibrosis and/or cirrhosis, other liver disease, ascites, and transplanted liver. Variables used in predicting initiation of antiviral treatment included insurance at first HCV screening, gender, other liver cancer, steatosis, and liver cell carcinoma. Variables used in predicting virologic cure included insurance at first HCV screening, transplanted liver, and ethnicity. CONCLUSION These patients have a high hepatic health burden, likely reflecting complications of untreated HCV and highlighting the urgency to cure HCV in this birth cohort. We found differences in HCV care outcomes based on sociodemographic and clinical variables. More work is needed to understand the mechanisms of these differences in care outcomes and to improve HCV care.
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The hepatitis C cascade of care in the Belgian HIV population: One step closer to elimination. Int J Infect Dis 2021; 105:217-223. [PMID: 33610786 DOI: 10.1016/j.ijid.2021.02.068] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 02/16/2021] [Accepted: 02/16/2021] [Indexed: 12/14/2022] Open
Abstract
OBJECTIVES The Belgian population of people living with HIV (PLHIV) has unrestricted access to direct-acting antiviral (DAA) treatment for hepatitis C virus (HCV) infection, since 2017. International literature claims that half of the patients remain untreated in high-income countries with unrestricted access to DAA. This study was initiated to provide an overview of the present situation in Belgium and recommendations for HCV care in PLHIV in other regions. METHODS This was a retrospective, multicenter study of PLHIV in Belgium, from January 1, 2007 to December 31, 2018. The HCV cascade of care was examined. RESULTS Out of 4607 unique PLHIV, 322 (7.0%) tested positive for HCV antibody and HCV RNA positivity was seen in 289 (6.3%). Of those with a proven HCV infection, 207/289 (71.6%) initiated treatment. Of the 171 (82.6%) persons with a sustained virologic response (SVR), 16 (9.4%) subjects were reinfected. CONCLUSIONS We present a care cascade of 4607 PLHIV in Belgium. Treatment initiation and SVR rates were high compared to other regions. Implementation of a national HCV register to track progress and yearly screening, especially in PLHIV with high-risk behavior, remains crucial. Identifying reasons for not initiating treatment is necessary to achieve elimination of HCV in PLHIV by 2030.
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van Boemmel-Wegmann S, Lo Re V, Park H. Early Treatment Uptake and Cost Burden of Hepatitis C Therapies Among Newly Diagnosed Hepatitis C Patients with a Particular Focus on HIV Coinfection. Dig Dis Sci 2020; 65:3159-3174. [PMID: 31938995 PMCID: PMC7358122 DOI: 10.1007/s10620-019-06037-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Accepted: 12/30/2019] [Indexed: 12/14/2022]
Abstract
BACKGROUND Despite the high efficacy and safety associated with direct-acting antivirals (DAAs), access to HCV treatment has been frequently restricted because of the high DAA drug costs. OBJECTIVES To (1) compare HCV treatment initiation rates between HCV monoinfected and HCV/HIV coinfected patients before (pre-DAA period) and after (post-DAA period) all-oral DAAs became available; and to (2) estimate the HCV treatment costs for payers and patients. RESEARCH DESIGN AND METHODS A retrospective analysis of the MarketScan® Databases (2009-2016) was conducted for newly diagnosed HCV patients. Multivariable logistic regression was used to estimate the odds ratio (OR) of initiating HCV treatments during the pre-DAA and post-DAA periods. Kruskal-Wallis test was used to compare drug costs for dual, triple and all-oral therapies. RESULTS A total of 15,063 HCV patients [382 (2.5%) HIV coinfected] in the pre-DAA period and 14,896 [429 (2.9%) HIV coinfected] in the post-DAA period were included. HCV/HIV coinfected patients had lower odds of HCV treatment uptake compared to HCV monoinfected patients during the pre-DAA period [OR, 0.59; 95% confidence interval (CI), 0.45-0.78], but no significant difference in odds of HCV treatment uptake was observed during the post-DAA period (OR, 1.08; 95% CI, 0.87-1.33). From 2009 to 2016, average payers' treatment costs (dual, $20,820; all-oral DAAs, $99,661; p < 0.001) as well as average patients' copayments (dual, $593; all-oral DAAs $933; p < 0.001) increased significantly. CONCLUSIONS HCV treatment initiation rates increased, especially among HCV/HIV coinfected patients, from the pre-DAA to the post-DAA period. However, payers' expenditures per course of therapy saw an almost fivefold increase and patients' copayments increased by 55%.
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Affiliation(s)
- Sascha van Boemmel-Wegmann
- Department of Pharmaceutical Outcomes and Policy, University of Florida College of Pharmacy, HPNP Building Room 3325, 1225 Center Drive, Gainesville, FL, 32610, USA
| | - Vincent Lo Re
- Division of Infectious Diseases, Department of Medicine and Center for Clinical Epidemiology and Biostatistics, Center for Pharmacoepidemiology Research and Training, Department of Biostatistics, Epidemiology, and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Haesuk Park
- Department of Pharmaceutical Outcomes and Policy, University of Florida College of Pharmacy, HPNP Building Room 3325, 1225 Center Drive, Gainesville, FL, 32610, USA.
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Li L, Lin C, Liang LJ, Pham QL, Feng N, Nguyen AT. HCV infection status and care seeking among people living with HIV who use drugs in Vietnam. AIDS Care 2020; 32:83-90. [PMID: 32297556 DOI: 10.1080/09540121.2020.1739209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
HCV co-infection is widespread among people living with HIV who use drugs (PLHWUD). However, HCV testing was inconsistently implemented among PLHWUD. The low infection awareness and mental health challenges together impede PLHWUD's treatment-seeking. The study used baseline data of a randomized controlled trial conducted in Vietnam. HCV infection status was collected through self-report and medical record review. A linear mixed-effects regression model was used to examine the relationships between PLHWUD's perceived barriers to seeking healthcare, their depressive symptoms, and the consistencies in HCV status reports. Among the 181 PLHWUD in the study, one-third (64; 35.4%) had inconsistent self-reports and medical records of HIV infection status. The agreement between the two records was fair (Kappa statistics = 0.43). PLHWUD with consistent HCV infection confirmed by both medical records and self-reports perceived lower levels of healthcare-seeking barriers than those with discrepant HCV reports (estimated difference = -1.59, SE = 0.71, P = 0.027). Depressive symptoms were significantly correlated with healthcare-seeking barriers among those with discrepant HCV results (estimate = 0.17, SE = 0.06, P = 0.007). There is an urgent need to extend HCV screening efforts and increase HCV awareness among PLHWUD. Explicit HCV result notification and integrated mental health support are recommended to facilitate patients' access to needed care.
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Affiliation(s)
- Li Li
- Semel Institute for Neuroscience and Human Behavior - Center for Community Health, the University of California, Los Angeles, CA, USA
| | - Chunqing Lin
- Semel Institute for Neuroscience and Human Behavior - Center for Community Health, the University of California, Los Angeles, CA, USA
| | - Li-Jung Liang
- Semel Institute for Neuroscience and Human Behavior - Center for Community Health, the University of California, Los Angeles, CA, USA
| | - Quang Loc Pham
- Semel Institute for Neuroscience and Human Behavior - Center for Community Health, the University of California, Los Angeles, CA, USA
| | - Nan Feng
- Semel Institute for Neuroscience and Human Behavior - Center for Community Health, the University of California, Los Angeles, CA, USA
| | - Anh Tuan Nguyen
- National Institute of Hygiene and Epidemiology, Hanoi, Vietnam
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Real-world efficacy of direct acting antiviral therapies in patients with HIV/HCV. PLoS One 2020; 15:e0228847. [PMID: 32053682 PMCID: PMC7018045 DOI: 10.1371/journal.pone.0228847] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 01/24/2020] [Indexed: 12/12/2022] Open
Abstract
The advent of direct-acting antiviral (DAA) therapies has dramatically transformed HCV treatment, with most recent trials demonstrating high efficacy rates (>90%) across all genotypes and special populations, including patients with HIV/HCV coinfection. The efficacy rates of HCV treatment are nearly identical between patients with HCV monofection and patients with HIV/HCV coinfection; however, there are limited studies to compare real-world efficacy with efficacy observed in clinical trials. Using a database from HIV clinics across the United States (US), we identified 432 patients with HIV/HCV coinfection who completed DAA therapy from January 1, 2014 to March 31, 2017 and were assessed for efficacy. Efficacy was evaluated as sustained virologic response (SVR) 12 weeks after DAA completion; furthermore, factors associated with achieving SVR12 were identified. In this analysis, we found DAA therapies to be effective, with 94% of the patients achieving SVR12 and 6% experiencing virologic failure. Baseline variables, including older age, HCV viral load <800K IU/ML, FIB-4 score <1.45, absence of depression, diabetes, substance abuse, and use of DAA regimens without ribavirin were significant predictors of achieving SVR12. Patients with fewer comorbidities, better liver health, and lower HCV viral loads at baseline were more likely to achieve treatment success. Our results were consistent with other real-world studies, supporting the use of HCV therapy in HIV/HCV coinfected patients.
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12
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Puhr R, Wright ST, Hoy JF, Templeton DJ, Durier N, Matthews GV, Russell D, Law MG. Retrospective study of hepatitis C outcomes and treatment in HIV co-infected persons from the Australian HIV Observational Database. Sex Health 2019; 14:345-354. [PMID: 28482168 DOI: 10.1071/sh16151] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 03/18/2017] [Indexed: 12/15/2022]
Abstract
BACKGROUND The widespread availability of direct-acting antivirals (DAAs) is expected to drastically improve the treatment uptake and cure rate of hepatitis C virus (HCV). In this paper, rates of and factors associated with HCV treatment uptake and cure in the HIV co-infected population in Australia were assessed before access to DAAs. METHODS The medical records of patients in the Australian HIV Observational Database who were reported to be HCV antibody positive from 1999 to 2014 were reviewed for HCV treatment data. Patients with detectable HCV RNA were included in this analysis. Logistic regression models were applied to identify factors associated with treatment uptake and HCV sustained virological response (SVR) 24 weeks' post treatment. RESULTS The median follow-up time of those with chronic HCV/HIV co-infection was 103 months (interquartile range 51-166 months). Of 179 HCV viraemic patients, 79 (44.1%) began treatment. In the adjusted model, a higher METAVIR score was the only significant factor associated with treatment uptake (odds ratio (OR) 8.87, 95% confidence interval (CI) 2.00-39.3, P=0.004). SVR was achieved in 37 (50%) of 74 treated patients. HCV genotypes 2/3 compared with 1/4 remained the only significant factor for SVR in an adjusted multivariable setting (OR 5.44, 95% CI 1.53-19.4, P=0.009). CONCLUSIONS HCV treatment uptake and SVR have been relatively low in the era of interferon-containing regimens, in Australian HIV/HCV coinfected patients. With new and better tolerated DAAs, treatment of HCV is likely to become more accessible, and identification and treatment of HCV in co-infected patients should become a priority.
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Affiliation(s)
- Rainer Puhr
- The Kirby Institute, University of New South Wales, Sydney, NSW 2052, Australia
| | - Stephen T Wright
- The Kirby Institute, University of New South Wales, Sydney, NSW 2052, Australia
| | | | - David J Templeton
- The Kirby Institute, University of New South Wales, Sydney, NSW 2052, Australia
| | - Nicolas Durier
- TREAT Asia, amfAR-The Foundation for AIDS Research, Bangkok 10110, Thailand
| | - Gail V Matthews
- The Kirby Institute, University of New South Wales, Sydney, NSW 2052, Australia
| | - Darren Russell
- Cairns Sexual Health Service, Cairns, Qld 4870, Australia
| | - Matthew G Law
- The Kirby Institute, University of New South Wales, Sydney, NSW 2052, Australia
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Chen YC, Thio CL, Cox AL, Ruhs S, Kamangar F, Wiberg KJ. Trends in hepatitis C treatment initiation among HIV/hepatitis C virus-coinfected men engaged in primary care in a multisite community health centre in Maryland: a retrospective cohort study. BMJ Open 2019; 9:e027411. [PMID: 30928964 PMCID: PMC6475218 DOI: 10.1136/bmjopen-2018-027411] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
OBJECTIVES Little is known about the cascade of hepatitis C care among HIV/hepatitis C virus (HCV)-coinfected patients in community-based clinics. Thus, we analysed our data from the interferon era to understand the barriers to HCV treatment, which may help improve getting patients into treatment in the direct-acting antivirals era. DESIGN Retrospective cohort study. SETTING Four HIV clinics of a multisite community health centre in the USA. PARTICIPANTS 1935 HIV-infected men with >1 medical visit to the clinic between 2011 and 2013. Of them, 371 had chronic HCV and were included in the analysis for HCV care continuum during 2003-2014. OUTCOME MEASURES HCV treatment initiation was designated as the primary outcome for analysis. Multivariate logistic regression was performed to identify factors associated with HCV treatment initiation. RESULTS Among the 371 coinfected men, 57 (15%) initiated HCV treatment. Entering care before 2008 (adjusted OR [aOR, 3.89; 95% CI, 1.95 to 7.78), higher educational attainment (aOR, 3.20; 95% CI, 1.59 to 6.44), HCV genotype 1 versus non-1 (aOR, 0.21; 95% CI, 0.07 to 0.65) and HIV suppression (aOR, 2.13; 95% CI, 1.12 to 4.06) independently predicted treatment initiation. Stratification by entering care before or after 2008 demonstrated that higher educational attainment was the only factor independently associated with treatment uptake in both periods (aOR, 2.79; 95% CI, 1.13 to 6.88 and aOR, 4.10; 95% CI, 1.34 to 12.50, pre- and post-2008, respectively). Additional associated factors in those entering before 2008 included HCV genotype 1 versus non-1 (aOR, 0.09; 95% CI, 0.01 to 0.54) and HIV suppression (aOR, 2.35; 95% CI, 1.04 to 5.33). CONCLUSIONS Some traditional barriers predicted HCV treatment initiation in those in care before 2008; however, the patients' level of educational attainment remained an important factor even towards the end of the interferon era. Further studies will need to determine whether educational attainment persists as an important determinant for initiating direct-acting antiviral therapies.
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Affiliation(s)
- Yun-Chi Chen
- Department of Biology, Morgan State University, Baltimore, Maryland, USA
| | - Chloe L Thio
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Andrea L Cox
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | | | - Farin Kamangar
- Department of Biology, Morgan State University, Baltimore, Maryland, USA
| | - Kjell J Wiberg
- Department of Medicine, Sinai Hospital, Baltimore, Maryland, USA
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14
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Jain MK, Thamer M, Therapondos G, Shiffman ML, Kshirsagar O, Clark C, Wong RJ. Has Access to Hepatitis C Virus Therapy Changed for Patients With Mental Health or Substance Use Disorders in the Direct-Acting-Antiviral Period? Hepatology 2019; 69:51-63. [PMID: 30019478 DOI: 10.1002/hep.30171] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 07/05/2018] [Indexed: 12/20/2022]
Abstract
Direct-acting antivirals (DAA) for hepatitis C virus (HCV) became available in 2014, but the role of mental health or substance use disorders (MH/SUD) on access to treatment is unknown. The objective of this study was to examine the extent and predictors of HCV treatment in the pre-DAA and post-DAA periods in four large, diverse health care settings in the United States. We conducted a retrospective analysis of 29,544 adults with chronic HCV who did or did not receive treatment from January 1, 2011, to February 28, 2017. Kaplan-Meier curve was used to examine cumulative risk for receiving HCV treatment stratified by MH/SUD. Predictors of HCV treatment in the pre-DAA (January 1, 2011, to December 31, 2013) and post-DAA (January 1, 2014, to February 28, 2017) cohorts were analyzed using multivariate generalized estimating equations and a modified Poisson model. Overall, 21.7% (2,879/13,240) of those with chronic HCV post-DAA were treated compared with 3.5% (574/16,304) in the pre-DAA period. Compared with non-Hispanic whites, Hispanic whites (adjusted odds ratio [AOR] 0.36; 95% confidence interval [CI], 0.25, 0.52) were less likely to be treated in the post-DAA period. Those with concurrent nonalcoholic fatty liver disease (AOR 1.39; 95% CI, 1.05, 1.83), cirrhosis (AOR 2.00; 95% CI, 1.74, 2.31), and liver transplant (AOR 2.72; 95% CI, 1.87, 3.94) were more likely to be treated post-DAA. Those with MH/SUD were less likely to be treated both before (AOR 0.46; 95% CI, 0.36, 0.60) and after (AOR 0.63; 95% CI, 0.55, 0.71) DAA therapy was available. Overall, the cumulative risk for receiving HCV treatment from 2011 to 2017 among those with versus without MH/SUD was 13.6% versus 21.6%, respectively (P < 0.001). Conclusion: The volume of patients treated for HCV has increased in the post-DAA period, especially among those with liver-related comorbidities, but disparities in access to treatment continue among those with MH/SUD.
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Affiliation(s)
- Mamta K Jain
- Division of Infectious Diseases, University of Texas Southwestern Medical Center, Dallas, TX.,Parkland Health and Hospital System, Dallas, TX
| | - Mae Thamer
- Medical Technology and Practice Patterns Institute, Bethesda, MD
| | - George Therapondos
- Multi-Organ Transplant Institute, Ochsner Health System, New Orleans, LA
| | | | - Onkar Kshirsagar
- Medical Technology and Practice Patterns Institute, Bethesda, MD
| | | | - Robert J Wong
- Division of Gastroenterology & Hepatology, Alameda Health System - Highland Hospital, Oakland, CA
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15
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Allyn PR, O'Malley SM, Ferguson J, Tseng CH, Chew KW, Bhattacharya D. Attitudes and potential barriers towards hepatitis C treatment in patients with and without HIV coinfection. Int J STD AIDS 2018; 29:334-340. [PMID: 28820346 PMCID: PMC5670019 DOI: 10.1177/0956462417725462] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This study aimed to assess attitudes and potential barriers towards treatment in patients with hepatitis C virus (HCV) infection, comparing those with and without HIV coinfection. A cross-sectional survey of 82 HCV-infected adults with and without HIV was conducted in greater Los Angeles between November 2013 and July 2015. Overall, there were 53 (64.6%) with HIV coinfection, 20 (25.0%) with self-reported cirrhosis, and 22 (26.8%) with a history of prior HCV treatment. Of all, 93.2% wanted HCV treatment, but 45.9% were unwilling/unable to spend anything out of pocket, 29.4% were waiting for new therapies, and 23.5% were recommended to defer HCV treatment. HIV/HCV-coinfected patients were more likely to want treatment within one year (90.2% versus 68.2%, p = 0.02), more willing to join a clinical trial (74.5% versus 8.0%, p < 0.01), more willing to take medications twice daily (86.3% versus 61.5%, p = 0.01), and more likely to prefer hepatitis C treatment by an infectious diseases/HIV physician (36.7% versus 4.0%, p < 0.01). Of all, 77.1% of coinfected patients were willing to change antiretroviral therapy if necessary to treat HCV, but only 48.0% of patients were willing to take a medication if it had not been studied in HIV-positive patients. Treatment preferences differ between HIV/HCV-coinfected and HCV-monoinfected patients. Despite a strong willingness among the study cohort to start HCV treatment, other factors such as cost, access to medications, and provider reluctance may be delaying treatment initiation.
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Affiliation(s)
- P R Allyn
- 1 Division of Infectious Diseases, Department of Medicine, 12222 University of California Los Angeles , Los Angeles, CA, USA
| | - S M O'Malley
- 2 UCLA Center for Clinical AIDS Research and Education (CARE), Los Angeles, CA, USA
| | - J Ferguson
- 3 Department of Medicine, Stanford University Medical Center, Palo Alto, CA, USA
| | - C H Tseng
- 4 Department of Medicine Statistics Core, 12222 University of California Los Angeles , Los Angeles, CA, USA
| | - K W Chew
- 1 Division of Infectious Diseases, Department of Medicine, 12222 University of California Los Angeles , Los Angeles, CA, USA
- 2 UCLA Center for Clinical AIDS Research and Education (CARE), Los Angeles, CA, USA
| | - D Bhattacharya
- 1 Division of Infectious Diseases, Department of Medicine, 12222 University of California Los Angeles , Los Angeles, CA, USA
- 2 UCLA Center for Clinical AIDS Research and Education (CARE), Los Angeles, CA, USA
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16
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Butner JL, Gupta N, Fabian C, Henry S, Shi JM, Tetrault JM. Onsite treatment of HCV infection with direct acting antivirals within an opioid treatment program. J Subst Abuse Treat 2017; 75:49-53. [DOI: 10.1016/j.jsat.2016.12.014] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 12/02/2016] [Accepted: 12/16/2016] [Indexed: 12/22/2022]
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17
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Steiner S, Bucsics T, Schwabl P, Mandorfer M, Scheiner B, Aichelburg MC, Grabmeier-Pfistershammer K, Ferenci P, Trauner M, Peck-Radosavljevic M, Reiberger T. Progress in eradication of HCV in HIV positive patients with significant liver fibrosis in Vienna. Wien Klin Wochenschr 2017; 129:517-526. [PMID: 28130599 PMCID: PMC5552846 DOI: 10.1007/s00508-016-1162-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 12/19/2016] [Indexed: 12/16/2022]
Abstract
Aim We aimed to investigate the efficacy of interferon and ribavirin-free sofosbuvir/ledipasvir (SOF/LDV) and ritonavir boosted paritaprevir/ombitasvir with or without dasabuvir (2D/3D) regimens in a real-life cohort of human immunodeficiency virus/hepatitis C virus (HIV/HCV) coinfected patients. The study focused on efficacy, need for changes in antiretroviral therapy (ART) due to drug-drug interaction (DDI), and treatment-associated changes in liver stiffness. Methods In this study 36 patients (n = 21 SOF/LDV and n = 15 2D/3D) were retrospectively analyzed. Depending on the genotype the following treatment regimens were used: HCV genotype (GT)-1: either SOF/LDV or 3D, no patient with HCV-GT2 was included, HCV-GT3: SOF/LDV, HCV-GT4: 2D. Results Approximately one third (35.3%) of patients were treatment-experienced and 13.9% had cirrhosis. Antiretroviral therapy had to be changed in 38.1% of SOF/LDV and 60% of 2D/3D patients prior to anti-HCV treatment due to expected DDIs. We observed sustained virologic response (SVR) rates of 100% in patients treated with SOF/LDV (19/19) and 2D/3D (14/14). One 2D/3D patient was lost to follow-up, while two SOF/LDV patients died during therapy from non-treatment-related causes. They were excluded from the analysis. Between baseline and follow-up liver stiffness decreased from 11.4 to 8.3 kPa (p = 0.008) and from 8.1 to 5.7 kPa (p = 0.001) in SOF/LDV and 2D/3D patients, respectively. Conclusions We confirmed the excellent HCV eradication rates >95% in a real-life cohort of HIV/HCV coinfected patients treated with SOF/LDV and 2D/3D. We observed no HCV relapse or breakthrough. More patients treated with 2D/3D required a change in ART than patients treated with SOF/LDV. Additionally, HCV eradication led to a rapid decline in liver stiffness.
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Affiliation(s)
- Sebastian Steiner
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria.,Vienna HIV & Liver Study Group, Vienna, Austria
| | - Theresa Bucsics
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria.,Vienna HIV & Liver Study Group, Vienna, Austria
| | - Philipp Schwabl
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria.,Vienna HIV & Liver Study Group, Vienna, Austria
| | - Mattias Mandorfer
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria.,Vienna HIV & Liver Study Group, Vienna, Austria
| | - Bernhard Scheiner
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria.,Vienna HIV & Liver Study Group, Vienna, Austria
| | - Maximilian Christopher Aichelburg
- Division of Immunology, Allergy and Infectious Diseases, Department of Dermatology, Medical University of Vienna, Vienna, Austria.,Vienna HIV & Liver Study Group, Vienna, Austria
| | - Katharina Grabmeier-Pfistershammer
- Division of Immunology, Allergy and Infectious Diseases, Department of Dermatology, Medical University of Vienna, Vienna, Austria.,Vienna HIV & Liver Study Group, Vienna, Austria
| | - Peter Ferenci
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Michael Trauner
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Markus Peck-Radosavljevic
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria.,Vienna HIV & Liver Study Group, Vienna, Austria
| | - Thomas Reiberger
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria. .,Vienna HIV & Liver Study Group, Vienna, Austria.
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18
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Mayer KH, Crawford P, Dant L, Gillespie S, Singal R, Vandermeer M, Muench J, Long T, Quach T, Chaudhry A, Crane HM, Lembo D, Mills R, McBurnie MA. HIV and Hepatitis C Virus Screening Practices in a Geographically Diverse Sample of American Community Health Centers. AIDS Patient Care STDS 2016; 30:237-46. [PMID: 27286294 DOI: 10.1089/apc.2015.0314] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Because of the advent of highly effective treatments, routine screening for HIV and hepatitis C virus (HCV) has been recommended for many Americans. This study explored the perceived barriers surrounding routine HIV and HCV screening in a diverse sample of community health centers (CHCs). The Community Health Applied Research Network (CHARN) is a collaboration of CHCs, with a shared clinical database. In July, 2013, 195 CHARN providers working in 12 CHCs completed a survey of their attitudes and beliefs about HIV and HCV testing. Summary statistics were generated to describe the prevalence of HIV and HCV and associated demographics by CHCs. HIV and HCV prevalence ranged from 0.1% to 5.7% for HIV and from 0.1% to 3.7% for HCV in the different CHCs. About 15% of the providers cared for at least 50 individuals with HIV and the same was true for HCV. Two-thirds saw less than 10 patients with HIV and less than half saw less than 10 patients with HCV. Less than two-thirds followed USPHS guidelines to screen all patients for HIV between the ages of 13 and 64, and only 44.4% followed the guidance to screen all baby boomers for HCV. Providers with less HIV experience tended to be more concerned about routine screening practices. More experienced providers were more likely to perceive lack of time being an impediment to routine screening. Many US CHC providers do not routinely screen their patients for HIV and HCV. Although additional education about the rationale for routine screening may be indicated, incentives to compensate providers for the additional time they anticipate spending in counseling may also facilitate increased screening rates.
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Affiliation(s)
- Kenneth H. Mayer
- Fenway Health, Harvard Medical School, Beth Israel Deaconess, Boston, Massachusetts
| | - Phil Crawford
- Kaiser Permanente, Center for Health Research, Portland, Oregon
| | - Lydia Dant
- Fenway Health, Harvard Medical School, Beth Israel Deaconess, Boston, Massachusetts
| | | | - Robbie Singal
- Fenway Health, Harvard Medical School, Beth Israel Deaconess, Boston, Massachusetts
| | | | - John Muench
- Department of Family Medicine, Oregon Health & Science University, Portland, Oregon
| | - Tim Long
- Near Northwest Services Organization, Alliance of Chicago, Chicago, Illinois
| | - Thu Quach
- Community Health and Research, Asian Health Services, Oakland, California
| | | | - Heidi M. Crane
- Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, Washington
| | - Daniela Lembo
- Beaufort Jasper Hampton Comprehensive Health Services, Ridgeland, South Carolina
| | - Robert Mills
- Health Resources and Services Administration, HIV/AIDS Bureau, Rockville, Maryland
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19
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Oramasionwu CU, Kashuba AD, Napravnik S, Wohl DA, Mao L, Adimora AA. Non-initiation of hepatitis C virus antiviral therapy in patients with human immunodeficiency virus/hepatitis C virus co-infection. World J Hepatol 2016; 8:368-75. [PMID: 26981174 PMCID: PMC4779165 DOI: 10.4254/wjh.v8.i7.368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2015] [Revised: 10/24/2015] [Accepted: 12/03/2015] [Indexed: 02/06/2023] Open
Abstract
AIM To assess whether reasons for hepatitis C virus (HCV) therapy non-initiation differentially affect racial and ethnic minorities with human immunodeficiency virus (HIV)/HCV co-infection. METHODS Analysis included co-infected HCV treatment-naïve patients in the University of North Carolina CFAR HIV Clinical Cohort (January 1, 2004 and December 31, 2011). Medical records were abstracted to document non-modifiable medical (e.g., hepatic decompensation, advanced immunosuppression), potentially modifiable medical (e.g., substance abuse, severe depression, psychiatric illness), and non-medical (e.g., personal, social, and economic factors) reasons for non-initiation. Statistical differences in the prevalence of reasons for non-treatment between racial/ethnic groups were assessed using the two-tailed Fisher's exact test. Three separate regression models were fit for each reason category. Odds ratios and their 95%CIs (Wald's) were computed. RESULTS One hundred and seventy-one patients with HIV/HCV co-infection within the cohort met study inclusion. The study sample was racially and ethnically diverse; most patients were African-American (74%), followed by Caucasian (19%), and Hispanic/other (7%). The median age was 46 years (interquartile range = 39-50) and most patients were male (74%). Among the 171 patients, reasons for non-treatment were common among all patients, regardless of race/ethnicity (50% with ≥ 1 non-modifiable medical reason, 66% with ≥ 1 potentially modifiable medical reason, and 66% with ≥ 1 non-medical reason). There were no significant differences by race/ethnicity. Compared to Caucasians, African-Americans did not have increased odds of non-modifiable [adjusted odds ratio (aOR) = 1.47, 95%CI: 0.57-3.80], potentially modifiable (aOR = 0.72, 95%CI: 0.25-2.09) or non-medical (aOR = 0.90, 95%CI: 0.32-2.52) reasons for non-initiation. CONCLUSION Race/ethnicity alone is not predictive of reasons for HCV therapy non-initiation. Targeted interventions are needed to improve access to therapy for all co-infected patients, including minorities.
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Affiliation(s)
- Christine U Oramasionwu
- Christine U Oramasionwu, Angela DM Kashuba, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC 27599, United States
| | - Angela Dm Kashuba
- Christine U Oramasionwu, Angela DM Kashuba, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC 27599, United States
| | - Sonia Napravnik
- Christine U Oramasionwu, Angela DM Kashuba, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC 27599, United States
| | - David A Wohl
- Christine U Oramasionwu, Angela DM Kashuba, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC 27599, United States
| | - Lu Mao
- Christine U Oramasionwu, Angela DM Kashuba, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC 27599, United States
| | - Adaora A Adimora
- Christine U Oramasionwu, Angela DM Kashuba, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC 27599, United States
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20
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Attar BM, Van Thiel DH. Hepatitis C virus: A time for decisions. Who should be treated and when? World J Gastrointest Pharmacol Ther 2016; 7:33-40. [PMID: 26855810 PMCID: PMC4734952 DOI: 10.4292/wjgpt.v7.i1.33] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 09/09/2015] [Accepted: 11/17/2015] [Indexed: 02/06/2023] Open
Abstract
Cirrhosis is the most important risk factor for hepatocellular carcinoma (HCC) regardless of the etiology of cirrhosis. Compared to individuals who are anti-hepatitis C virus (HCV) seronegative, anti-HCV seropositive individuals have a greater mortality from both hepatic as well as nonhepatic disease processes. The aim of this paper is do describe the burden of HCV infection and consider treatment strategies to reduce HCV-related morbidity and mortality. The newly developed direct acting antiviral (DAA) therapies are associated with greater rates of drug compliance, fewer adverse effects, and appear not to be limited by the presence of a variety of factors that adversely affect the outcome of interferon-based therapies. Because of the cost of the current DAA, their use has been severely rationed by insurers as well as state and federal agencies to those with advanced fibrotic liver disease (Metavir fibrosis stage F3-F4). The rationale for such rationing is that many of those recognized as having the disease progress slowly over many years and will not develop advanced liver disease manifested as chronic hepatitis C, cirrhosis, and experience any of the multiple complications of liver disease to include HCC. This mitigation has a short sided view of the cost of treatment of hepatitis C related disease processes and ignores the long-term expenses of hepatitis C treatment consisting of the cost of treatment of hepatitis C, the management of cirrhosis with or without decompensation as well as the cost of treatment of HCC and liver transplantation. We believe that treatment should include all HCV infected patients including those with stage F0-F2 fibrosis with or without evidence of coexisting liver disease. Specifically, interferon (IFN)-free regimens with the current effective DAAs without liver staging requirements and including those without evidence of hepatic diseases but having recognized extrahepatic manifestations of HCV infection is projected to be the most cost-effective approach for treating HCV in all of its varied presentations. Early rather than later therapy of HCV infected individuals would be even more efficacious than waiting particularly if it includes all cases from F0-F4 hepatic disease. Timely therapy will reduce the number of individuals developing advanced liver disease, reduce the cost of treating these cases and more importantly, reduce the lifetime cost of treatment of those with any form of HCV related disease as well as HCV associated all - cause mortality. Importantly, HCV treatment regimens without any restrictions would result in a substantial reduction in health care expenditure and simultaneously reduce the number of infected individuals who are infecting others.
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21
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Cope R, Glowa T, Faulds S, McMahon D, Prasad R. Treating Hepatitis C in a Ryan White-Funded HIV Clinic: Has the Treatment Uptake Improved in the Interferon-Free Directly Active Antiviral Era? AIDS Patient Care STDS 2016; 30:51-5. [PMID: 26744994 DOI: 10.1089/apc.2015.0222] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Now that highly efficacious, interferon-free (IFN-free), direct acting antivirals (DAA) for the treatment of hepatitis C (HCV) have closed the gap between treatment and cure, identifying barriers that prevent initiation of treatment is more crucial than ever. This is a retrospective study utilizing Electronic Medical Records and Prior Authorization Records to identify HCV treatment gaps, including predictors for intention-to-treat and treatment initiation in the first 15 months of a Ryan White funded human immunodeficiency virus (HIV)/HCV co-infection clinic. This study included 128 adults ≥ 18 years old with HIV and chronic HCV infection who had visited the treatment center at least once since January 2013. Provider intent-to-treat was used to differentiate patients actively considered for treatment based on documentation kept by a multidisciplinary HCV team. Members of this group who had gone on to initiate treatment were identified. Baseline characteristics were compared. Rates of active treatment consideration and treatment initiation were 30% and 14%, respectively. HCV treatment-naïve individuals were less likely to be considered for treatment [risk ratio (RR) 1.58, 95% confidence interval (CI) 1.07-2.32] and initiate therapy (RR 2.33, 95% CI 0.97-5.60). Advanced liver disease had no significant association. Black race (RR 1.96, 95% CI 0.90-4.25) and Medicaid insurance holders (RR 1.90, 95% CI 0.95-3.82) tended to be less likely to initiate therapy. The availability of IFN-free DAA regimens has yet to increase HCV treatment uptake in our HIV/HCV co-infected population. Barriers to HCV treatment initiation have shifted from medical contraindications to socioeconomic variables.
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Affiliation(s)
- Rebecca Cope
- University of Pittsburgh School of Pharmacy, Pittsburgh, Pennsylvania (at time of research)
| | - Thomas Glowa
- Division of Infectious Diseases, Department of Medicine, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Samantha Faulds
- Division of Infectious Diseases, Department of Medicine, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Deborah McMahon
- Division of Infectious Diseases, Department of Medicine, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Ramakrishna Prasad
- Division of Infectious Diseases, Department of Medicine, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
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Kovari H, Ledergerber B, Cavassini M, Ambrosioni J, Bregenzer A, Stöckle M, Bernasconi E, Kouyos R, Weber R, Rauch A. High hepatic and extrahepatic mortality and low treatment uptake in HCV-coinfected persons in the Swiss HIV cohort study between 2001 and 2013. J Hepatol 2015; 63:573-80. [PMID: 25937433 DOI: 10.1016/j.jhep.2015.04.019] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 03/17/2015] [Accepted: 04/21/2015] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS The landscape of HCV treatments is changing dramatically. At the beginning of this new era, we highlight the challenges for HCV therapy by assessing the long-term epidemiological trends in treatment uptake, efficacy and mortality among HIV/HCV-coinfected people since the availability of HCV therapy. METHODS We included all SHCS participants with detectable HCV RNA between 2001 and 2013. To identify predictors for treatment uptake uni- and multivariable Poisson regression models were applied. We further used survival analyses with Kaplan-Meier curves and Cox regression with drop-out as competing risk. RESULTS Of 12,401 participants 2107 (17%) were HCV RNA positive. Of those, 636 (30%) started treatment with an incidence of 5.8/100 person years (PY) (95% CI 5.3-6.2). Sustained virological response (SVR) with pegylated interferon/ribavirin was achieved in 50% of treated patients, representing 15% of all participants with replicating HCV-infection. 344 of 2107 (16%) HCV RNA positive persons died, 59% from extrahepatic causes. Mortality/100 PY was 2.9 (95% CI 2.6-3.2) in untreated patients, 1.3 (1.0-1.8) in those treated with failure, and 0.6 (0.4-1.0) in patients with SVR. In 2013, 869/2107 (41%) participants remained HCV RNA positive. CONCLUSIONS Over the last 13 years HCV treatment uptake was low and by the end of 2013, a large number of persons remain to be treated. Mortality was high, particularly in untreated patients, and mainly due to non-liver-related causes. Accordingly, in HIV/HCV-coinfected patients, integrative care including the diagnosis and therapy of somatic and psychiatric disorders is important to achieve mortality rates similar to HIV-monoinfected patients.
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Affiliation(s)
- Helen Kovari
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital, Zurich, University of Zurich, Switzerland.
| | - Bruno Ledergerber
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital, Zurich, University of Zurich, Switzerland
| | - Matthias Cavassini
- Division of Infectious Diseases, University Hospital, Lausanne, Switzerland
| | - Juan Ambrosioni
- Division of Infectious Diseases, University Hospital, Geneva, Switzerland
| | - Andrea Bregenzer
- Division of Infectious Diseases, Cantonal Hospital, St. Gall, Switzerland
| | - Marcel Stöckle
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital, Basle, Switzerland
| | | | - Roger Kouyos
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital, Zurich, University of Zurich, Switzerland; Institute of Medical Virology, University of Zurich, Switzerland
| | - Rainer Weber
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital, Zurich, University of Zurich, Switzerland
| | - Andri Rauch
- University Clinic of Infectious Diseases, University Hospital Berne and University of Berne, Berne, Switzerland
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23
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Do A, Mittal Y, Liapakis A, Cohen E, Chau H, Bertuccio C, Sapir D, Wright J, Eggers C, Drozd K, Ciarleglio M, Deng Y, Lim JK. Drug Authorization for Sofosbuvir/Ledipasvir (Harvoni) for Chronic HCV Infection in a Real-World Cohort: A New Barrier in the HCV Care Cascade. PLoS One 2015; 10:e0135645. [PMID: 26312999 PMCID: PMC4552165 DOI: 10.1371/journal.pone.0135645] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 07/23/2015] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND New treatments for hepatitis C (HCV) infection hold great promise for cure, but numerous challenges to diagnosing, establishing care, and receiving therapy exist. There are limited data on insurance authorization for these medications. MATERIALS AND METHODS We performed a retrospective chart review of patients receiving sofosbuvir/ledipasvir (SOF/LED) from October 11-December 31, 2014 to determine rates and timing of drug authorization. We also determined predictors of approval, and those factors associated with faster decision and approval times. RESULTS Of 174 patients prescribed HCV therapy during this period, 129 requests were made for SOF/LED, of whom 100 (77.5%) received initial approval, and an additional 17 patients (13.9%) ultimately received approval through the appeals process. Faster approval times were seen in patients with Child-Pugh Class B disease (14.4 vs. 24.7 days, p = 0.048). A higher proportion of patients were initially approved in those with Medicare/Medicaid coverage (92.2% vs. 71.4%, p = 0.002) and those with baseline viral load ≥ 6 million IU/mL (84.1% vs. 62.5%, p = 0.040). Linear regression modeling identified advanced fibrosis, high Model of End Stage Liver Disease (MELD) score, and female gender as significant predictors of shorter decision and approval times. On logistic regression, Medicare/Medicaid coverage (OR 5.96, 95% CI 1.66-21.48) and high viral load (OR 4.52, 95% CI 1.08-19.08) were significant predictors for initial approval. CONCLUSIONS Early analysis of real-world drug authorization outcomes between October-December 2014 reveals that nearly one in four patients are initially denied access to SOF/LED upon initial prescription, although most patients are eventually approved through appeal, which delays treatment initiation. Having Medicare/Medicaid and advanced liver disease resulted in a higher likelihood of approval as well as earlier decision and approval times. More studies are needed to determine factors resulting in higher likelihood of denial and to evaluate approval rates and times after implementation of restrictive prior authorization guidelines.
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Affiliation(s)
- Albert Do
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, United States of America
| | - Yash Mittal
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, United States of America
| | - AnnMarie Liapakis
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, United States of America
- Yale Liver Center, Section of Digestive Diseases, New Haven, CT, United States of America
- Liver Transplantation Program, Yale-New Haven Hospital, New Haven, CT, United States of America
| | - Elizabeth Cohen
- Liver Transplantation Program, Yale-New Haven Hospital, New Haven, CT, United States of America
| | - Hong Chau
- Yale Liver Center, Section of Digestive Diseases, New Haven, CT, United States of America
| | - Claudia Bertuccio
- Yale Liver Center, Section of Digestive Diseases, New Haven, CT, United States of America
| | - Dana Sapir
- Yale Liver Center, Section of Digestive Diseases, New Haven, CT, United States of America
| | - Jessica Wright
- Apothecary and Wellness Center, Yale-New Haven Hospital, New Haven, CT, United States of America
| | - Carol Eggers
- Yale Liver Center, Section of Digestive Diseases, New Haven, CT, United States of America
| | - Kristine Drozd
- Yale Liver Center, Section of Digestive Diseases, New Haven, CT, United States of America
| | - Maria Ciarleglio
- Yale Liver Center, Section of Digestive Diseases, New Haven, CT, United States of America
| | - Yanhong Deng
- Yale Liver Center, Section of Digestive Diseases, New Haven, CT, United States of America
| | - Joseph K. Lim
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, United States of America
- Yale Liver Center, Section of Digestive Diseases, New Haven, CT, United States of America
- Liver Transplantation Program, Yale-New Haven Hospital, New Haven, CT, United States of America
- * E-mail:
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24
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Karageorgopoulos DE, Allen J, Bhagani S. Hepatitis C in human immunodeficiency virus co-infected individuals: Is this still a "special population"? World J Hepatol 2015; 7:1936-52. [PMID: 26244068 PMCID: PMC4517153 DOI: 10.4254/wjh.v7.i15.1936] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 06/24/2015] [Accepted: 07/21/2015] [Indexed: 02/06/2023] Open
Abstract
A substantial proportion of individuals with chronic hepatitis C virus (HCV) are co-infected with human immunodeficiency virus (HIV). Co-infected individuals are traditionally considered as one of the "special populations" amongst those with chronic HCV, mainly because of faster progression to end-stage liver disease and suboptimal responses to treatment with pegylated interferon alpha and ribavirin, the benefits of which are often outweighed by toxicity. The advent of the newer direct acting antivirals (DAAs) has given hope that the majority of co-infected individuals can clear HCV. However the "special population" designation may prove an obstacle for those with co-infection to gain access to the new agents, in terms of requirement for separate pre-licensing clinical trials and extensive drug-drug interaction studies. We review the global epidemiology, natural history and pathogenesis of chronic hepatitis C in HIV co-infection. The accelerated course of chronic hepatitis C in HIV co-infection is not adequately offset by successful combination antiretroviral therapy. We also review the treatment trials of chronic hepatitis C in HIV co-infected individuals with DAAs and compare them to trials in the HCV mono-infected. There is convincing evidence that HIV co-infection no longer diminishes the response to treatment against HCV in the new era of DAA-based therapy. The management of HCV co-infection should therefore become a priority in the care of HIV infected individuals, along with public health efforts to prevent new HCV infections, focusing particularly on specific patient groups at risk, such as men who have sex with men and injecting drug users.
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Affiliation(s)
- Drosos E Karageorgopoulos
- Drosos E Karageorgopoulos, Joanna Allen, Sanjay Bhagani, Department of Infectious Diseases/HIV Medicine, Royal Free London NHS Foundation Trust, London NW3 2QG, United Kingdom
| | - Joanna Allen
- Drosos E Karageorgopoulos, Joanna Allen, Sanjay Bhagani, Department of Infectious Diseases/HIV Medicine, Royal Free London NHS Foundation Trust, London NW3 2QG, United Kingdom
| | - Sanjay Bhagani
- Drosos E Karageorgopoulos, Joanna Allen, Sanjay Bhagani, Department of Infectious Diseases/HIV Medicine, Royal Free London NHS Foundation Trust, London NW3 2QG, United Kingdom
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25
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Solomon SS, Mehta SH, Srikrishnan AK, Solomon S, McFall AM, Laeyendecker O, Celentano DD, Iqbal SH, Anand S, Vasudevan CK, Saravanan S, Lucas GM, Kumar MS, Sulkowski MS, Quinn TC. 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 2014; 15:36-45. [PMID: 25486851 DOI: 10.1016/s1473-3099(14)71045-x] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
BACKGROUND 90% of individuals infected with hepatitis C virus (HCV) worldwide reside in resource-limited settings. We aimed to characterise the prevalence of HCV, HIV/HCV co-infection, and the HCV care continuum in people who inject drugs in India. METHODS 14 481 people (including 31 seeds--individuals selected as the starting point for sampling because they were well connected in the drug using community) who inject drugs were sampled from 15 cities throughout India using respondent-driven sampling from Jan 2, 2013 to Dec 19, 2013. Data from seeds were excluded from all analyses. HCV prevalence was estimated by the presence of anti-HCV antibodies incorporating respondent-driven sampling weights. HCV care continuum outcomes were self-reported except for viral clearance in treatment-experienced participants. FINDINGS The median age of participants was 30 years (IQR 24-36) and 13 608 (92·4%) of 14 449 were men (data were missing for some variables). Weighted HCV prevalence was 5777 (37·2%) of 14 447; HIV/HCV co-infection prevalence was 2085 (13·2%) of 14 435. Correlates of HCV infection included high lifetime injection frequency, HIV positivity, and a high prevalence of people with HIV RNA (more than 1000 copies per mL) in the community. Of the 5777 people who inject drugs that were HCV antibody positive, 440 (5·5%) were aware of their status, 225 (3·0%) had seen a doctor for their HCV, 79 (1·4%) had taken HCV treatment, and 18 (0·4%) had undetectable HCV RNA. Of 12 128 participants who had not previously been tested for HCV, 6138 (50·5%) did not get tested because they had not heard of HCV. In the 5777 people who were HCV antibody positive, 2086 (34·4%) reported harmful or hazardous alcohol use, of whom 1082 (50·4%) were dependent, and 3821 (65·3%) reported needle sharing. Awareness of HCV positive status was significantly associated with higher education, HIV testing history, awareness of HIV positive status, and higher community antiretroviral therapy coverage. INTERPRETATION The high burden of HCV and HIV/HCV co-infection coupled with low-access to HCV services emphasises an urgent need to include resource-limited settings in the global HCV agenda. Although new treatments will become available worldwide in the near future, programmes to improve awareness and reduce disease progression and transmission need to be scaled up without further delay. Failure to do so could result in patterns of rising mortality, undermining advances in survival attributed to widespread HIV treatment. FUNDING US National Institutes of Health.
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Affiliation(s)
- Sunil Suhas Solomon
- Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA; Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA; YR Gaitonde Centre for AIDS Research and Education, Chennai, India.
| | - Shruti H Mehta
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | | | - Suniti Solomon
- YR Gaitonde Centre for AIDS Research and Education, Chennai, India
| | - Allison M McFall
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Oliver Laeyendecker
- Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA; National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - David D Celentano
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Syed H Iqbal
- YR Gaitonde Centre for AIDS Research and Education, Chennai, India
| | - Santhanam Anand
- YR Gaitonde Centre for AIDS Research and Education, Chennai, India
| | | | | | - Gregory M Lucas
- Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | | | - Mark S Sulkowski
- Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Thomas C Quinn
- Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA; National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
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