Do directly acting antiviral agents for HCV increase the risk of hepatic decompensation and decline in renal function? Results from ERCHIVES.

BACKGROUND: Directly acting antiviral agents (DAA) have been associated with hepatic decompensation, especially in patients with pre-treatment cirrhosis, but this risk is not well defined. AIM: To determine the incidence of hepatic decompensation, liver transplantation, death and worsening renal function in patients treated with a Paritaprevir/ritonavir, Ombitasvir, Dasabuvir (PrOD), sofosbuvir/simeprevir or sofosbuvir/ledipasvir regimen. METHODS: We followed ERCHIVES participants treated with the above regimens for up to 12 weeks post-treatment. We excluded those with HIV, HBsAg+ and pre-existing diagnosis of hepatic decompensation and hepatocellular carcinoma. RESULTS: Of 3728 persons on PrOD, 1578 on sofosbuvir/simeprevir and 10 440 on sofosbuvir/ledipasvir, incidence rates (95% CI) of hepatic decompensation/1000 patient-years were 10.6 (5.89-17.36) for the PrOD, 32.4 (20.74-48.16) for the sofosbuvir/simeprevir and 13.0 (9.74-17.10) for the sofosbuvir/ledipasvir. Among those with baseline cirrhosis, these rates were 36.9 (19.1-64.5), 61.8 (38.2-94.5) and 41.1 (29.9-55.2) respectively, while among those without cirrhosis at baseline, these rates were 2.7 (0.6-8.0), 7.5 (1.5-21.8) and 2.7 (1.2-5.4). Advanced fibrosis was associated with increased risk of hepatic decompensation in all groups [HR (95% CI) per 0.5 unit increase in FIB-4 score: PrOD 1.11 (1.07-1.16); sofosbuvir/simeprevir 1.03 (1.01-1.05); sofosbuvir/ledipasvir 1.02 (1.01-1.03)]. There were no deaths. Proportion of persons with eGFR decrease >30 ml/min/1.73 m2 was higher among the PrOD group, but presence of cirrhosis did not appear to affect this. CONCLUSIONS: The incidence of hepatic decompensation in persons treated with PrOD, up to 12 weeks after completion of treatment, was comparable to those treated with sofosbuvir/ledipasvir regimen, and was lower than among those treated with a sofosbuvir/simeprevir regimen. Such risk was predominantly observed in those with pre-treatment cirrhosis.

Adding ribavirin to newer DAA regimens does not affect SVR rates in HCV genotype 1 infected persons: results from ERCHIVES.

BACKGROUND: Ribavirin is a key component of several hepatitis C virus (HCV) treatment regimens. However, its utility in combination with newer directly acting anti-viral agents regimens is unclear. AIM: To determine the SVR rates with paritaprevir/ritonavir/ombitasvir/dasabuvir (PrOD) regimen ± ribavirin and compare this with sofosbuvir/simeprevir and sofosbuvir/ledipasvir regimens. METHODS: We used Electronically Retrieved Cohort of HCV Infected Veterans (ERCHIVES), a well-established national cohort of HCV-infected Veterans to identify HCV genotype 1 infected persons initiated on the above regimens. We excluded those with HIV coinfection, positive HBsAg and missing HCV RNA. RESULTS: We identified 1235 persons on PrOD (75.5% ribavirin), 1254 on sofosbuvir/simeprevir (16.9% ribavirin) and 4247 on sofosbuvir/ledipasvir (23.3% ribavirin). Among HCV genotype 1a infected persons, ribavirin was prescribed to 99.2% on PrOD, 18.2% on sofosbuvir/simeprevir and 23.3% on sofosbuvir/ledipasvir. The SVR rates ranged from 92.6% to 100% regardless of the treatment regimen, presence of cirrhosis or HCV subtype, except in PrOD group without ribavirin, HCV genotype 1a without cirrhosis (SVR 80%, N = 5). There were minor, clinically insignificant differences in SVR rates in those treated with or without ribavirin in each of the treatment groups, regardless of presence of cirrhosis at baseline. In multivariable logistic regression analysis, ribavirin use was not associated with achieving SVR in any group. CONCLUSIONS: In HCV genotype 1 infected persons, PrOD, sofosbuvir/simeprevir and sofosbuvir/ledipasvir regimens, are associated with high rates of SVR in actual clinical settings, which are comparable to clinical trials results (except PrOD genotype 1a with cirrhosis where the number was too small). The benefit of adding ribavirin to these regimens in the ERCHIVES treated cohort is not established.

Viral dynamic modelling of Hepatitis C and resistance-associated variants in haemophiliacs.

AIM: Chronic hepatitis C virus (HCV) infection is an important source of morbidity and mortality among haemophiliacs. Limited data are available regarding treatment intervention using direct-acting antivirals (DAAs) and theoretical concerns regarding accumulation of drug-associated resistance variants (RAVs) remain. We conducted a pilot study of treatment with telaprevir/pegylated interferon-alfa/ribavirin to evaluate treatment response and the role of lead-in DAA therapy on mutational selection of resistance variants. METHODS: Ultra-deep sequence analysis was performed at baseline, 48 hours and 168 hours after treatment initiation. RESULTS: No dominant RAVs were identified at baseline, but low-level RAVs were noted at baseline in all subjects. Viral dynamic models were used to assess treatment responses. The efficacy parameter (Ɛ) for lead-in ranged from 0 to 0.9745 (mean = 0.514). Subsequent addition of telaprevir resulted in a mean efficacy of more than 0.999. This was comparable to subjects who started all three medications simultaneously. A total of 80% achieved SVR. While rapid shifts in the RAV population following DAA initiation were observed, treatment failure associated with A156V was observed in only one patient. Adverse event profiles were similar to that observed in non-haemophilia cohorts. There was no evidence of factor inhibitor formation. There was no evidence that lead-in provided benefit in terms of response efficacy. CONCLUSION: These data support DAA-based therapy in those with inherited bleeding disorders.

Virologic response and haematologic toxicity of boceprevir- and telaprevir-containing regimens in actual clinical settings.

Effectiveness, safety and tolerability of boceprevir (BOC) and telaprevir (TPV) in actual clinical settings remain unknown. We determined rates of sustained virologic response (SVR) and haematologic adverse effects among persons treated with BOC- or TPV-containing regimens, compared with pegylated interferon/ribavirin (PEG/RBV). Using an established cohort of hepatitis C virus (HCV)-infected persons, Electronically Retrieved Cohort of HCV Infected Veterans (ERCHIVES), we identified those treated with a BOC- or TPV-containing regimen and HCV genotype 1-infected controls treated with PEG/RBV. We excluded those with HIV coinfection and missing HCV RNA values to determine SVR. Primary endpoints were SVR (undetectable HCV RNA ≥12 weeks after treatment completion) and haematologic toxicity (grade 3/4 anaemia, neutropenia and thrombocytopenia). We evaluated 2288 persons on BOC-, 409 on TPV-containing regimen and 6308 on PEG/RBV. Among these groups, respectively, 31%, 43% and 9% were treatment-experienced; 17%, 37% and 14% had baseline cirrhosis; 63%, 54% and 48% were genotype 1a. SVR rates among noncirrhotics were as follows: treatment naïve: 65% (BOC), 67% (TPV) and 31% (PEG/RBV); treatment experienced: 57% (BOC), 54% (TPV) and 13% (PEG/RBV); (P-value not significant for BOC vs TPV; P < 0.0001 for BOC or TPV vs PEG/RBV). Haematologic toxicities among BOC-, TPV- and PEG/RBV-treated groups were as follows: grade 3/4 anaemia 7%, 11% and 3%; grade 4 thrombocytopenia 2.2%, 5.4% and 1.7%; grade 4 neutropenia 8.2%, 5.6% and 3.4%. SVR rates are higher and closer to those reported in pivotal clinical trials among BOC- and TPV-treated persons compared with PEG/RBV-treated persons. Haematologic adverse events are frequent, but severe toxicity is uncommon.

Hepatitis E infection in HIV-infected liver and kidney transplant candidates.

Hepatitis E virus (HEV) has been reported to cause acute and chronic hepatitis in those with HIV infection and among solid organ transplant recipients in Europe. Limited data indicate that HEV is endemic in the United States, but the prevalence and significance of HEV infection among those with HIV and awaiting solid organ transplantation is unknown. We evaluated anti-HEV IgM and IgG antibodies and HEV RNA in 166 HIV-infected solid organ transplant candidates enrolled in the NIH HIV-Transplant Cohort. Overall prevalence of anti-HEV IgG approached 20% in both liver and renal transplant candidates. Evidence of recent infection was present in approximately 2% of liver transplant candidates and none of the kidney transplant candidates. HEV RNA was not detected in any patient. We conclude that markers of HEV infection are frequent among candidates for transplantation, but active, ongoing viremia is not seen. Evidence of recent infection (acute on chronic) liver disease was present in liver but not kidney recipients.

Hepatitis C virus NS3 mutations in haemophiliacs.

Haemophiliacs have high hepatitis C virus (HCV) exposure risk from blood products that did not undergo heat inactivation or disease-specific screening prior to 1987. Repeated exposure to infected factor concentrates predisposes haemophiliacs to higher likelihood of HCV from multiple sources. HIV coinfection could result in impaired clearance of less fit variants resulting in enrichment of quasispecies carrying resistance mutations. We postulated that haemophiliacs demonstrate increased prevalence of baseline signature mutations in the HCV NS3/4 serine protease coding domain. We examined the prevalence of putative HCV protease inhibitor mutations, mutations, subclassified into dominant mutations if changes conferred resistance, and minor variants not associated with drug resistance, in patients with haemophilia A or B, infected with HCV or HCV/HIV, prior to HCV PI exposure. A total of 151 subjects were evaluated, including 22 haemophiliacs and 129 non-haemophilic controls. Of the 58 mutations detected, 55 (95%) were resistance mutations and three (5%) were minor variants. Dominant mutations were detected in 10 (45.5%) haemophiliacs and in 43 (33.3%) controls (OR 1.67, 95% CI 0.67-4.16). There was no statistical difference in proportion of dominant mutations (P = 0.27) or minor variants (P = 0.47) between groups, despite adjustment for HIV status (P = 0.44). No significant differences in dominant or minor resistance mutations between haemophiliacs and non-haemophiliacs were observed. HIV presence or prior HAART exposure did not affect baseline distribution. We conclude that haemophiliacs are not at higher risk for pre-existing HCV PI mutations, and prospective studies of response to PI-based regimens with HCV activity are indicated.

Hepatitis C virus treatment and survival in patients with hepatitis C and human immunodeficiency virus co-infection and baseline anaemia.

The impact of pretreatment anaemia on survival in individuals with hepatitis C virus (HCV) and human immunodeficiency virus (HIV) co-infection is not known. Moreover, HCV treatment is offered less frequently to individuals with anaemia, due to haematological side effects of the treatment regimen. This study aimed to determine the effect of HCV treatment on survival among HCV/HIV co-infected individuals with pretreatment anaemia using the Electronically Retrieved Cohort of HCV-Infected Veterans (ERCHIVES). Individuals with HCV/HIV co-infection were included in current analyses. Participants were considered treated if they were prescribed ≥ 4 weeks of HCV treatment. All-cause mortality data were obtained using record linkage. Survival analyses were performed using Cox proportional hazard models. Among 5000 HCV/HIV co-infected individuals, 1671 (33.4%) had pretreatment anaemia. In a follow-up period of up to 7 years (19,500 person-years), individuals with anaemia had significantly higher mortality rate compared with those without anaemia [144.2 (95% CI: 134.5-154.7) vs 47.5 (44.0-51.2) per 1000 person-years, respectively]. Among individuals with anaemia, HCV treatment was associated with significantly lower mortality rate [66.6 (44.3-100.2) vs 149.6 (139.2-160.5) per 1000 person-years, for treated vs untreated, respectively]. Treatment remained associated with substantial survival benefit after taking into account the effect of multiple comorbidities (hazards ratio: 0.34, 95% CI: 0.21-0.62). These data suggest that HCV/HIV co-infected individuals with pretreatment anaemia have significantly higher mortality compared with those without anaemia. HCV treatment is associated with substantial survival benefit in this group. Additional studies are needed to determine strategies to improve HCV treatment rates among this group.

Liver transplant outcomes in HIV+ haemophilic men.

Hepatitis C virus infection is the major cause of end-stage liver disease and the major indication for transplantation (OLTX), including among HIV-HCV co-infected individuals. The age of HCV acquisition differs between haemophilic and non-haemophilic candidates, which may affect liver disease outcomes. The purpose of the study was to compare rates of pre- and post-OLTX mortality between co-infected haemophilic and non-haemophilic subjects without hepatocellular cancer participating in the Solid Organ Transplantation in HIV Study (HIV-TR). Clinical variables included age, gender, race, liver disease aetiology, BMI, antiretroviral therapy, MELD score, CD4 + cell count, HIV RNA PCR and HCV RNA PCR. Time to transplant, rejection and death were determined. Of 104 HIV-HCV positive subjects enrolled, 34 (32.7%) underwent liver transplantation, including 7 of 15 (46.7%) haemophilic and 27 of 89 (30.3%) non-haemophilic candidates. Although haemophilic subjects were younger, median 41 vs. 47 years, P = 0.01, they were more likely than non-haemophilic subjects to die pre-OLTX, 5 (33.3%) vs. 13 (14.6%), P = 0.03, and reached MELD = 25 marginally faster, 0.01 vs. 0.7 years, P = 0.06. The groups did not differ in baseline BMI, CD4, detectable HIV RNA, detectable HCV RNA, time to post-OLTX death (P = 0.64), graft loss (P = 0.80), or treated rejection (P = 0.77). The rate of rejection was 14% vs. 36% at 1-year and 36% vs. 43% at 3-year, haemophilic vs. non-haemophilic subjects, respectively, and post-OLTX survival, 71% vs. 66% at 1-year and 38% vs. 53% at 3-year. Despite similar transplant outcomes, pretransplant mortality is higher among co-infected haemophilic than non-haemophilic candidates.

Health-related quality of life in subjects with HCV/HIV coinfection: results from ACTG 5178 study.

Although health-related quality of life (HRQOL) is diminished in HCV/HIV, the relationship between virologic response and maintenance therapy with HRQOL in this population is unknown. ACTG 5178 was a phase 2, randomized trial, with three steps - Step 1: all subjects received pegylated interferon (PEG-IFN)/ribavirin (P/R) for 12 weeks. Step 2: subjects who failed to achieve early viral response (EVR) were randomized to PEG-IFN or observational control for an additional 72 weeks. Step 3: subjects with EVR from step 1 continued on P/R for a total of 72 weeks with 24 weeks follow-up off-therapy. HRQOL, symptom distress and depression levels were measured at multiple time points. In step 1 (n = 329), there was a significant decline in HRQOL in all dimensions. In step 3 (n = 169), the overall HRQOL and three of its eight dimensions (general health, role function and pain score) were increased, and achievement of sustained virologic response was associated with increased general health and cognitive function. In step 2 (n = 85), there was no significant change in HRQOL and no significant difference between groups (PEG-IFN vs observational control). There was a significant decline in HRQOL during the initial 12 weeks of therapy. Thereafter, the HRQOL profile differed for subjects with EVR vs without EVR. Maintenance therapy with PEG-IFN had no impact on the HRQOL.

Mutations associated with occult hepatitis B virus infection result in decreased surface antigen expression in vitro.

Occult hepatitis B virus (HBV) infection is characterized by the absence of detectable hepatitis B surface antigen (HBsAg) in the serum, despite detectable HBV DNA. Investigations of the mechanisms underlying the development of occult HBV infection are lacking in the current literature, although viral mutations in the surface region, resulting in decreased HBsAg expression or secretion, represent one potential mechanism. Wild-type HBsAg expression vectors were constructed from genotype-matched chronic HBV sequences. Site-directed mutagenesis was then utilized to introduce three genotype A mutations - M103I, K122R and G145A - associated with occult HBV infection in vivo, alone and in combination, into the wild-type HBsAg vectors. Transfection of Huh7 and HepG2 cell lines was performed, and cell culture supernatants and cell lysates were collected over 7 days to assess the effects of these mutations on extracellular and intracellular HBsAg levels. The G145A mutation resulted in significantly decreased extracellular and intracellular HBsAg expression in vitro. The most pronounced reduction in HBsAg expression was observed when all three mutations were present. The mutations evaluated in vitro in the current study resulted in decreased HBsAg expression and potentially increased hepatic retention and/or decreased hepatic secretion of synthesized HBsAg, which could explain the lack of HBsAg detection that is characteristic of occult HBV infection in vivo.

The incidence, predictors and management of anaemia and its association with virological response in HCV / HIV coinfected persons treated with long-term pegylated interferon alfa 2a and ribavirin.

BACKGROUND: The association of anaemia with outcomes in the HCV/HIV coinfected persons undergoing HCV treatment remains unclear. AIMS: To study the incidence, predictors and management of anaemia, and its association with outcomes among persons treated with pegylated interferon and weight-based ribavirin. METHODS: Retrospective analysis of a prospective controlled treatment trial of HCV/HIV coinfection. RESULTS: Among 329 subjects enrolled, 40% developed anaemia during the first 12-18 weeks of treatment (median haemoglobin decrease at week 4: 2.2 g/dL). Among 169 subjects who achieved early virological response and received therapy for 72 weeks, 55% eventually developed anaemia. However, median haemoglobin levels stayed stable after 12-18 weeks of initial therapy. Among these 169 subjects, 45% were prescribed an erythropoiesis stimulating agent (ESA), with 17% receiving it prior to a drop in haemoglobin meeting protocol definition of anaemia. Only 27% completed the study without any ribavirin dose modification. Age >40 years, lower BMI, zidovudine use and lower entry haemoglobin were significant predictors of anaemia in the multi-covariate model. Among all 329, sustained virological response (SVR) rate was similar in those with or without anaemia (23% vs. 30%; P=0.17) with no evidence of association between anaemia or ESA use and treatment response. CONCLUSIONS: Anaemia is common in HCV/HIV coinfected persons undergoing HCV treatment, and only a minority of them are able to maintain ribavirin dose. Persons with age >40 years, lower baseline haemoglobin and lower baseline BMI should be monitored carefully. Prescription of erythropoiesis stimulating agent is common, but anaemia or erythropoiesis stimulating agent use is not associated with SVR.

Viral pathogens.

SUMMARY: Despite continuous improvement in safety and purity of blood products for individuals with haemophilia, transmissible agents continue to affect individuals with haemophilia. This chapter addresses three viral pathogens with significant clinical impact: HIV, hepatitis C and parvovirus B19. Hepatitis C is the leading cause of chronic hepatitis and the major co-morbid complication of haemophilia treatment. Clinically, asymptomatic intermittent alanine aminotransferase elevation is typical, with biopsy evidence of advanced fibrosis currently in 25%. Current treatment is effective in up to 70%, and many new agents are in development. For those progressing to end-stage liver disease, liver transplantation outcomes are similar to those in non-haemophilia subjects, although pretransplant mortality is higher. HIV infection, the second leading co-morbid condition in haemophilia, is managed as a chronic infection with highly active antiretroviral therapy (HAART). HAART also slows hepatitis C virus (HCV) progression in those with HIV/HCV co-infection. Viral inactivation and recombinant technologies have effectively prevented transfusion-transmitted viral pathogens in haemophilia. Human parvovirus B19 infection, typically associated with anaemia or, rarely severe aplastic crisis, is a non-lipid enveloped virus, for which standard inactivation techniques are ineffective. Thus, nucleic acid testing (NAT) to screen the blood supply for B19 DNA is currently under consideration by the Food and Drug Administration. To the extent, viral inactivation, recombinant, and NAT technologies are available worldwide, and the lifespan for those with haemophilia is approaching that of the normal population. The purpose of this chapter is to provide an update on three clinically significant transfusion-transmitted viral pathogens.

Virologic and clinical outcomes of hepatitis B virus infection in HIV-HBV coinfected transplant recipients.

Liver transplantation (LT) is the treatment of choice for end-stage liver disease, but is controversial in patients with human immunodeficiency virus (HIV) infection. Using a prospective cohort of HIV-hepatitis B virus (HBV) coinfected patients transplanted between 2001-2007; outcomes including survival and HBV clinical recurrence were determined. Twenty-two coinfected patients underwent LT; 45% had detectable HBV DNA pre-LT and 72% were receiving anti-HBV drugs with efficacy against lamivudine-resistant HBV. Post-LT, all patients received hepatitis B immune globulin (HBIG) plus nucleos(t)ide analogues and remained HBsAg negative without clinical evidence of HBV recurrence, with a median follow-up 3.5 years. Low-level HBV viremia (median 108 IU/mL, range 9-789) was intermittently detected in 7/13 but not associated with HBsAg detection or ALT elevation. Compared with 20 HBV monoinfected patients on similar HBV prophylaxis and median follow-up of 4.0 years, patient and graft survival were similar: 100% versus 85% in HBV mono- versus coinfected patients (p = 0.08, log rank test). LT is effective for HIV-HBV coinfected patients with complications of cirrhosis, including those who are HBV DNA positive at the time of LT. Combination HBIG and antivirals is effective as prophylaxis with no clinical evidence of HBV recurrence but low-level HBV DNA is detectable in approximately 50% of recipients.

T-helper cells and liver fibrosis in hepatitis C virus-monoinfected patients.

Limited data suggest that low T-helper cell levels may be observed in hepatitis C virus (HCV) monoinfected patients with decompensated liver disease. We sought to determine the distribution and relationship of T-helper cells (CD4) to liver fibrosis in HCV-monoinfected patients before and during pegylated interferon (PegIFN) therapy. CD4 populations were prospectively determined using flow cytometry. All subjects had compensated liver disease. Baseline and subsequent CD4 counts at treatment weeks 12, 24, 36 and 48 and at two time points following treatment discontinuation (weeks 60 and 72) were evaluated. Ishak score was determined by a central pathologist. At baseline, data from 267 subjects were available. Mean age was 50 and 68% were male/Caucasian. HCV viral load was >800 000 IU/mL in 55%. Nearly half (48%) were Ishak 4-6 with all stages represented. Mean CD4 count was 1004 cells/mm(3) + or - 400, and 6% had counts <500. There was a trend towards lower CD4 counts among cirrhotic subjects (P = 0.07). A CD4 decrease was noted following PegIFN initiation. Mean CD4 decline was 38.9% and was statistically significant for all fibrosis stages compared with baseline levels, but not between fibrosis levels. CD4 counts <500 cells/mm(3) are seen in <10% of HCV-monoinfected subjects. A trend towards lower CD4 counts in subjects with advanced fibrosis was observed. However, at baseline and during/after PegIFN therapy, no significant differences were observed between groups. CD4 counts declined during PegIFN treatment, but returned to baseline after completion. The significance of these findings in terms of disease progression and treatment response requires further evaluation.

Genomic variability associated with the presence of occult hepatitis B virus in HIV co-infected individuals.

Occult hepatitis B virus (O-HBV) infection is characterized by the presence of HBV DNA without detectable hepatitis B surface antigen (HBV DNA+/HBsAg-) in the serum. Although O-HBV is more prevalent during HBV/HIV co-infection, analysis of HBV mutations in co-infected patients is limited. In this preliminary study, HBV PreSurface (PreS) and surface (S) regions were amplified from 33 HIV-positive patient serum samples - 27 chronic HBV (C-HBV) and six O-HBV infections. HBV genotype was determined by phylogenetic analysis, while quasispecies diversity was quantified for the PreS, S and overlapping polymerase regions. C-HBV infections harboured genotypes A, D and G, compared to A, E, G and one mixed A/G infection for O-HBV. Interestingly, nonsynonymous-synonymous mutation values indicated positive immune selection in three regions for O-HBV vs one for C-HBV. Sequence analysis further identified new O-HBV mutations, in addition to several previously reported mutations within the HBsAg antigenic determinant. Several of these O-HBV mutations likely contribute to the lack of detectable HBsAg in O-HBV infection by interfering with detection in serologic assays, altering antigen secretion and/or decreasing replicative fitness.

Ciprofloxacin-induced acute cholestatic liver injury and associated renal failure. Case report and review.

Ciprofloxacin, a commonly prescribed fluoroquinolone antibiotic, has generally been well-tolerated; however, there are rare reports of associated hepatic failure or renal failure. We describe a case of a 65 year-old man with a history of ischemic cardiomyopathy who was treated with ciprofloxacin 500 mg twice daily for cellulitis. Six days into his treatment course, he developed acute cholestatic jaundice and acute anuric renal failure. Clinical, laboratory, and pathologic data suggest that the patient had developed reversible, severe ciprofloxacin-induced cholestatic liver injury and acute tubular necrosis requiring hemodialysis. Within two months of stopping the ciprofloxacin, the patient was off dialysis and back to his baseline creatinine in three months. Liver tests normalized by five months. This report illustrates a case of cholestatic liver injury and renal failure involving ciprofloxacin use. We review the literature regarding hepatic and renal injury as it relates to ciprofloxacin. To our knowledge, this represents the first case report of simultaneous acute cholestatic liver injury and renal failure secondary to ciprofloxacin.

HCV/ HIV co-infection: time to re-evaluate the role of HIV in the liver?

Because of major advances in the treatment of HIV/AIDS, HIV-positive persons now live longer, healthier lives; however, hepatitis C virus (HCV) is increasingly recognized as a major cause of morbidity and mortality in this population. Among HCV-infected persons, HIV co-infection is associated with increased HCV RNA levels, increased hepatic inflammation and fibrosis, and more rapid progression to cirrhosis and end-stage liver disease. Compounding this problem are reduced HCV treatment response rates among HCV/HIV co-infected persons. Moreover, antiretroviral therapy used to suppress HIV replication is often associated with a paradoxical increase in HCV RNA levels, as well as hepatotoxicity. Despite the adverse clinical consequences of HCV/HIV co-infection, the mechanisms by which these two viruses interact at the cellular level remain largely unexplored. This review focuses on the evidence demonstrating direct infection of hepatocytes by HIV, as well as the indirect mechanisms by which HIV may regulate HCV replication at the cellular level. A comprehensive understanding of virus-virus and virus-cell interactions is critical to the development of novel treatment strategies to combat HCV/HIV co-infection.

Characterization of hepatitis E-specific cell-mediated immune response using IFN-gamma ELISPOT assay.

In developing countries, hepatitis E (HEV) and hepatitis A (HAV) are the major causes of acute viral hepatitis with similar feco-oral modes of transmission. In contrast to the high seroprevalence of hepatitis A infection, a low seroprevalence of HEV among children in endemic areas has been reported. These data suggest the possibility that silent HEV infection is undiagnosed by the current available methods. Many of the serological tests used for HEV diagnosis have poor specificity and are unable to differentiate among different genotypes of HEV. Moreover, the RT-PCR used for HEV isolation is only valid for a brief period during the acute stage of infection. Cell-mediated immune (CMI) responses are highly sensitive, and long lasting after sub-clinical infections as shown in HCV and HIV. Our objective was to develop a quantitative assay for cell-mediated immune (CMI) responses in HEV infection as a surrogate marker for HEV exposure in silent infection. Quantitative assessment of the CMI responses in HEV will also help us to evaluate the role of CMI in HEV morbidity. In this study, an HEV-specific interferon-gamma (IFN-gamma) ELISPOT assay was optimized to analyze HEV-specific CMI responses. We used peripheral blood mononuclear cells (PBMC) and sera from experimentally infected chimpanzees and from seroconverted and control human subjects to validate the assay. The HEV-specific IFN-gamma ELISPOT responses correlated strongly and significantly with anti-HEV ELISA positive/negative results (rho=0.73, p=0.02). Moreover, fine specificities of HEV-specific T cell responses could be identified using overlapping HEV ORF2 peptides.

Response rates to pegylated interferon and ribavirin in HCV/HIV coinfection: a research synthesis.

Several recent trials have determined varying rates of response to pegylated interferon plus ribavirin (peg-IFN + RIB) in hepatitis C virus (HCV)/human immunodeficiency virus-coinfected patients. We sought to identify a pooled response rate and sources of interstudy variability. A literature search was conducted to identify randomized or prospective studies evaluating response rates to peg-IFN + RIB in coinfected patients. A Bayesian hierarchical model was used to estimate overall response rate. Between-study variance was calculated and sensitivity analyses were conducted. Meta-regression was employed to identify sources of between-study variability. The literature search yielded seven studies of 146, which matched keywords and inclusion criteria. The combined patient total was 784. Individual intention-to-treat response rates ranged from 27.3% to 44.2%. The pooled Bayesian estimate of percent response was 33.3%. Significant interstudy heterogeneity was detected. Meta-regression yielded no significant effects of covariates on response rate. Subanalyses by CD4+, HCV viral load and genotype yielded sustained virological response (SVR) odds ratios of 0.73 for low CD4+, 0.41 for high viral load and 0.30 for genotype 1/4. The pooled response rate is not attributable to any one study. Response is poor compared with HCV-monoinfected patients. Interstudy variability is not satisfactorily explained by factors influencing individual response, but may be due to differences between studies unavailable for inclusion in this analysis. However, both genotype 1/4 and high HCV viral load at baseline were significantly associated with a reduction in odds of SVR in pooled subanalysis. Improved treatments are needed in coinfected patients, especially with genotype 1/4 and high viral load.