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Acute hepatitis C in persons infected with the human immunodeficiency virus (HIV): The "Real-life Setting" proves the concept

Abstract

Objectives

Outbreaks of sexually transmitted acute HCV infection have been described recently in several cities in the western world. The epidemic affects mainly MSM who are coinfected with HIV and is supposably linked to certain sexual risk practices. Here, we compared our findings with current knowledge and recommendations.

Methods

HIV-positive patients with the diagnosis of acute HCV infection were included in the retrospective analysis. The patients came from outpatient infectious disease centers in northern German cities. We looked at markers of HIV and HCV infection and compared patients who received treatment and those who did not. Treated patients were followed up to 72 weeks.

Results

Three hundred nineteen HIV-positive patients with the diagnosis of acute hepatitis C between 2001 and 2008 and were included in the analysis. All patients were male, 315 (99%) patients were of caucasian origin, 296 (93%) declared homosexual contacts as a risk factor for HCV infection, intravenous drug use was declared in 3 (1%) cases. Median age at HCV diagnosis was 40 years (range 20-69 years). Median HCV viral load was 1.2 × 106 IU/mL, 222 patients (70%) had HCV genotype 1, 59 (18%) genotype 4. The median time of HIV infection was 5.5 years (range 0 to 22.4 years). Median HIV viral load was 110 copies/mL (range 25 to 10 × 106 copies/mL). The median CD 4 count was 461 cells/mm3 (range 55- 1331 cells/mm3). Two hundred and fourty-six patients (77%) received anti-HCV treatment, and 175 (55%) had completed therapy by the time of the analysis. Median treatment duration was 33 weeks (IQR 24.1-49.9). 93 of the 175 treated patients (53%) reached a sustained virological response (SVR). In the multivariate analysis, ART at diagnosis, HCV RNA drop at week 12, hemoglobin levels and higher platelets were associated with SVR. Treatment duration was significantly higher in the SVR group (40.6 weeks vs 26.6 weeks, p < 0.0001). Seventy-three patients (23%) did not receive anti-HCV treatment. In 19 of the untreated patients (26%) the hepatitis C virus was cleared spontaneously.

Conclusions

Our findings confirm that acute hepatitis C in HIV infected patients affects mainly MSM who acquire HCV sexually. Patients had a short duration of HIV infection and a stable immunological situation. In this real-life setting from urban regions in northern Germany, treatment rates appear to be high and effective.

Introduction

An outbreak of sexually transmitted acute hepatitis C virus (HCV) infection has been documented in large cities in Europe, the United States and Australia during the past years [1–7]. The epidemic, that mainly affects men who have sex with men (MSM) who are coinfected with the human immunodeficiency virus (HIV), seems to be linked to a certain sexual risk behavior within parts of the homosexual community and is suspected to be spread through a "sexual network" of men frequenting the same clubs and "sex parties" in different urban regions of the world. Whereas the transmission of HCV in this part of the world has been historically associated with parenteral infection such as intravenous drug use in the majority of cases, permucosal trauma seems to be the main risk factor in these "new" patients [8, 9].

Since the introduction of combination antiretroviral therapy (cART) has substantially prolonged survival [10], liver disease such as chronic hepatitis C is one of the major factors for mortality and morbidity in the HIV infected population [11]. Consequently, the assumed sexual spread of HCV may have a serious clinical impact for HIV positive MSM.

HIV coinfection seems to lead to a lower rate of spontaneous clearance in acute HCV infection, a faster fibrosis progression in chronic hepatitis C and reduces response rates to standard treatment regimens with pegylated interferon (PegIFM) and Ribavirin (RBV) [12–15] compared to the HCV monoinfected population.

Several groups from England, France, Germany, Australia, the United States and the Netherlands have recently published their data on the nature of the epidemic and treatment outcomes in HIV-acute HCV-coinfected patients. Sustained virological response rates in these studies ranged between 59 and 80% of the treated patients, depending on genotype and treatment duration [16]. Interestingly, the results from an observational European multicentre cohort showed no influence of HCV genotype or HCV viral load on overall SVR rates of 62% [17]. Several issues such as the type of pegylated interferon used, a benefit of additional ribavirin or the optimal starting point for treatment and treatment duration remain still unsolved. However, prospective trials have unfortunately not yet been undertaken and are urgently needed to answer these questions.

The aim of this retrospective analysis was to review treatment decisions and outcomes in HIV positive patients with acute hepatitis C in a routine clinical setting. Moreover, we tried to compare these findings with current knowledge and recommendations.

Patients and methods

Consecutive patients coinfected with HIV and acute hepatitis C were included in this retrospective analysis. The patients came from outpatient infectious disease centers in northern German cities. These centers care for approximately 9000 HIV positive patients annually, of whom about 1350 (15%) are HCV co-infected. Acute hepatitis C was defined as a positive HCV polymerase chain reaction (PCR), and at least two conditions out of the following being confirmed: HCV seroconversion within the last 6 months, an increase in serum ALT of more than 350 IU/mL or a suspected risk event in the past 6 months before diagnosis.

Data was collected by chart review. We looked at demographic factors, risk factors for HCV infection, HCV viral load and HIV surrogate markers as well as liver function tests at the time of diagnosis of acute HCV infection. The history of HIV infection, the current treatment for HIV infection, and the number of patients in stage C3 according to the classification of the Centre for Disease control (CDC, Atlanta, USA) [18] was taken into account.

Furthermore, the physician's clinical impression (symptomatic, asymptomatic) at the time of diagnosis of acute HCV was included in the analysis.

The patients were then divided into two groups, a treated group and an untreated group. Treated patients received at least one dose of either pegylated interferon α-2a (180 μg per week subcutaneously (s.c.)) or pegylated interferon α-2b (1.5 mg/kg body weight per week s.c.) with or without weight-based ribavirin (800-1200 mg/d).

Treated patients were followed with the same laboratory markers mentioned above at week 4, 12, 24 and 48 of treatment and during a 24-week follow up period after the last dose of interferon to define SVR. Untreated patients were followed up to observe spontaneous clearance.

Laboratory parameters were measured locally. HCV-PCR was performed with ultrasensitive assays with a lower limit of quantification (LLQ) between 15 IU/mL and 600 IU/ml, as detection limits changed over the time of the observation period.

Statistical analysis was performed using "R" (The R Foundation for Statistical Computing, Vienna, Austria). Student's t-test was used to compare groups, a p-value below 5% was considered statistically significant. A multivariate analysis by logistic regression was conducted to define the odd's ratios of SVR.

Results

A total of three hundred nineteen HIV-positive patients met the criteria for acute hepatitis C between 2001 and 2008 and were included in the analysis. Patients came from ten different ambulatory care centers in 4 different cities in Germany, however, 264 patients (83%) were diagnosed in Berlin. All patients were male, 315 (99%) patients were of caucasian origin, 296 (93%) declared homosexual contacts as the only possible risk factor for HCV infection, intravenous drug use was declared in 3 (1%) cases and for 21 patients (6%) no risk factor was indicated. Median age at HCV diagnosis was 40 years (range 20-69 years).

Median HCV viral load was 1.2 × 106 IU/mL. The HCV genotype distribution was as follows: 222 patients (70%) had genotype 1, 7 (2%) genotype 2, 26 (8%) genotype 3, 59 (18%) genotype 4, and in 5 (2%) patients the HCV genotype was not indicated. The median maximum alanin aminotransferse (ALT) level at diagnosis was 420 IU/mL (range 19 to 4217). The median bilirubin level was 1.2 mg/dL (range 0.1 to 35). In 83 cases (26%) patients were indicated as symptomatic by their physician.

The median time of HIV infection was 5.5 years (range 0 to 22.4 years). Two hundred patients (63%) were on cART or started cART at the time of HCV diagnosis, 26 patients had a history of antiretroviral therapy but were currently not treated, 79 patients were naïve for HIV therapy, and in 13 cases no data on HIV treatment could be retrieved. Overall, 105 patients (33%) were not treated for HIV infection. 59 (18%) patients were classified as CDC stage C3, in 4 cases this information was not available. Patients on cART did not differ from untreated patients in terms of ALT levels, bilirubin levels, absolute CD 4 lymphocyte count. HCV viral load was higher in the non-cART group (1.8 × 106 iU/mL vs 1.0 × 106 iU/mL).

Median HIV viral load was 110 copies/mL (range 25 to 10 × 106 copies/mL). The median CD 4 lymphocyte count was 461 cells/mm3 (range 55-1331 cells/mm3), median CD4 percentage was 24% (range 3 to 64). Baseline characteristics are summarized in Table 1.

Table 1 Baseline characteristics of the 319 HIV patients with acute hepatitis Ca.

Two hundred and fourty-six patients (77%) received anti-HCV treatment, and 175 (55%) had completed therapy by the time of the analysis. All treated patients received either pegylated interferon α-2a or α-2b, 240 patients (91% of treated patients) received additional ribavirin.

The median time from diagnosis to initiation of treatment was 12.6 weeks (IQR 4.7-24.4). Median treatment duration was 33 weeks (IQR 24.1-49.9). 93 of the 175 treated patients (53%) met the SVR criteria (HCV viral load undetectable 24 weeks after end of therapy), 42 (24%) did not and in another 40 patients the follow-up period was not yet terminated or data was missing. In the on-treatment analysis, 69% of the patients fulfilled the criteria for SVR. SVR was associated with an earlier onset of anti-HCV treatment after diagnosis (9.6 weeks vs 11 weeks), but this was not statistically significant. In multiple logistic regression a viral load drop at week 12, drop in hemoglobin levels at week 12, higher platelets and cART at the time of HCV diagnosis turned out statistically significant (Table 2). A rapid virological response (RVR, HCV RNA undetectable at week 4) was reached in 31% of patients. RVR predicted SVR in 87%. At week 12, 108 patients had undetectable HCV RNA (early virological response - EVR) and 70 patients (65%) reached an SVR. Of the 38 patients that did not fulfill the criterion of an EVR, only 6 (15%) finally had an SVR. Treatment duration was significantly higher in the SVR group (40.6 weeks vs 26.6 weeks, p < 0.0001). Moreover, we saw a trend towards lower HCV PCR levels at diagnosis and the achievement of SVR, however, this difference was not significant. No difference was seen in maximum GPT levels before treatment between patients with or without SVR.

Table 2 Multiple logistic regression of factors associated with SVR.

Treatment was interrupted before week 24 in 30 patients, in 15 cases due to non-response or virological breakthrough, in the other cases due to side effects. Seventy-three patients (23%) did not receive anti-HCV treatment. In 19 of the untreated patients (26%) the hepatitis C virus was cleared spontaneously. The median CD4 cell count in these patients was 461/mm3, median bilirubin was 2.15 mg/dL (p = 0.03) and the median GPT level was 744 IU/mL. In untreated patients without spontaneous clearance the median GPT level was 339 IU/mL and the median bilirubin level was 1 mg/dL. These differences were not statistically significant.

Discussion

This retrospective analysis could give an interesting insight on the "real life" management of acute hepatitis C in HIV coinfected patients. Our patients were mainly middle-aged men and nearly all of them indicated homosexual contacts as the assumed risk factor for acquiring HCV. This goes in line with the findings of other work groups dealing with the same issue [5, 18–20]. All of our patients were diagnosed in German urban areas with Berlin appearing to be the hotspot of transmission.

Our patients were HIV-positive and had a relatively stable immunological situation with a median CD4 count at 461 cells/mm3 and no more than 9 patients had a CD4 count below 200 cells /mm3 at the time of hepatitis C diagnosis. Only 18% of our patients had a history of an AIDS-defining event. Moreover, the median time of HIV infection was relatively low (about 5 years). This confirms findings from other cohorts [17] and one may conclude that an impaired immune system is not a necessary risk factor to acquire hepatitis C sexually. Although it has been postulated that HIV coinfection might facilitate HCV transmission by increasing both viral infectiousness because of higher HCV viral loads in serum and semen and viral susceptibility through impaired immunologic control of HCV [20, 21] no proof of this concept has yet been found. This leads to the thesis that behavioral risk factors such as "serosorting sex parties" and traumatic sexual practices are necessary for the sexual transmission [9]. Moreover, rare cases of sexual HCV transmission in HIV negative MSM have been described [22]. It is noteworthy that HIV infected patients are more likely to be diagnosed with concomitant diseases due to regular medical check-ups, which is also true for the diagnosis of hepatitis C. However, in several cohorts it has been shown recently that acute sexually transmitted hepatitis C rarely occurs in HIV-negative individuals and also not in HIV-infected women [23–26].

About one third of our patients was not treated for their HIV infection and several patients started HIV treatment when diagnosed with acute HCV infection. Considering the fact that HCV was acquired by risky sexual behavior, it is even more alarming that these persons have replicative HIV disease and therefore a high chance of transmission.

Seventy-seven percent of our patients received anti-HCV treatment. This is highly promising as similar cohorts in chronically co-infected patients showed considerably low rates of treatment initiation [27] although HIV coinfection has the potential to aggravate HCV disease progression [12]. This is even more important as liver-related death has become the most frequent cause of non-AIDS-related death in the HIV infected population, mainly due to hepatitis C virus coinfection [28].

We found high rates of SVR in our cohort. With 69% in the on-treatment analysis SVR rates were clearly higher than in chronically co-infected patients, although most of our patients had unfavourable genotypes 1 and 4. This has also been described by other groups and the SVR rates are in concordance with the rates found in several European cohorts [17]. Viral load drop at week 12, drop in hemoglobin levels at week 12, higher platelets and cART at the time of HCV diagnosis were significantly associated with SVR.

Most of the treated patients included in this analysis received additional ribavirin (91%) to their treatment with pegylated interferon. An impact of this combination on treatment outcome can therefore not be drawn from these data. It rather shows that physicians stick to approved regimens in clinical practice as ribavirin is part of the standard-of-care in chronic HCV infection. However, the use of ribavirin for the treatment of acute hepatitis C has been an issue of discussion. In acute HCV monoinfection high rates of SVR have been reached with interferon or pegylated interferon monotherapy [29–31]. In most of the trials on coinfected patients additional ribavirin had been used, but in the German cohort patients treated with pegylated interferon alone achieved higher SVR rates than patients on pegylated interferon and ribavirin combination therapy, although the difference in SVR was not statistically significant and the number of patients was low [32]. Matthews et al. described comparable response rates in coinfected patients from the Australian cohort when treated with PEG/RBV compared to monoinfected treated with PEG alone [32]. The median time from diagnosis to treatment initiation was 12.6 weeks. This implies that a part of the patients were treated late regarding the course of acute HCV infection. Some of our patients were rather to be classified as early chronic than as late acute. Of note, our data come from a retrospective analysis and not from a prospective trial. Patients in this analysis were included since 2001, and knowledge and treatment decisions changed over time. This analysis rather reflects acute hepatitis C under real-life conditions. Accordingly, patients that were treated earlier had higher rates of SVR.

We found a high rate of spontaneous clearance in the untreated patients group (26%). This confirms findings from a pooled analysis of several European cohorts [33]. However, HIV infection has been associated with high rates of HCV persistence, which, it has been hypothesized, is related to its impact on cellular immune function [34]. This was confirmed by Danta et al. who found that 95% of HIV-acute HCV coinfected patients developed persistent HCV infection [35]. The few patients that cleared HCV infection spontaneously had significantly higher ALT levels, were icteric and had higher cD4 cell counts. In our cohort, bilirubin and ALT levels were higher in patients who cleared HCV, and cD4 count was identical to the overall cohort, but no statistical significance could have been found. A real estimation of the spontaneous clearance rate in the natural course of HCV infection cannot be drawn from a dataset like ours. To date, clear-cut criteria for the likelihood of spontaneous clearance are not known. Most experts recommend to determine the drop of HCV RNA at week 4. If HCV RNA has dropped for 2 log or more, observation for spontaneous clearance might be reasonable in 4-weeks intervals up to week 12. However, delaying the start of treatment for too long may eradicate the benefit of early treatment [16]. In conclusion, our data describes the largest cohort of acute HCV infected patients so far. It is able to prove what has been postulated by several workgroups concerning the demographics and treatment outcomes in acute HCV and HIV coinfection. Especially in the setting of HIV infection, the physicians' awareness is needed to precociously spot HCV infections as early treatment leads to better results.

Financial disclosure

All participating centers have received a restricted grant from Essex Pharma GmbH.

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Acknowledgements

We would like to thank the following persons for their contribution to this work: Ivanka Krznaric, Andreas Wienbreyer, Bianca Reisenweber, Daniela Behrendt, Christian Hoffmann, Christoph Schuler, Elke Lauenroth-Mai, Wolfgang Schmidt.

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Correspondence to A Baumgarten.

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M Obermeier, P Ingiliz contributed equally to this work.

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Obermeier, M., Ingiliz, P., Weitner, L. et al. Acute hepatitis C in persons infected with the human immunodeficiency virus (HIV): The "Real-life Setting" proves the concept. Eur J Med Res 16, 237 (2011). https://doi.org/10.1186/2047-783X-16-5-237

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