Patient adherence issues in the treatment of hepatitis C.

The current standard-of-care treatments for chronic hepatitis C, based on a bitherapy that combines peginterferon alpha-2a or -2b and ribavirin for all genotypes, and on a triple therapy with the addition of an antiprotease specifically for genotype 1, are associated with a limited adherence that decreases their efficacy. The main factors limiting adherence are difficulties in taking the treatment and side effects that worsen the quality of life of the patients. Programs of therapeutic education are essential to improve adherence, quality of life, likelihood of viral suppression, improvement of liver disease, and decrease of late complications. Therapeutic education should be understood as an acquisition of decisional, technical, and social competency with the purpose of making the patient able to make health choices, realize their own life plans, and use health care resources in the best manner. The patient should be placed in the center of an organization, comprising various care workers who include social service professionals and medical staff. For hepatitis C, therapeutic education may be separated into three phases: a first phase corresponding to the educative diagnosis; a second phase corresponding to support during treatment; and the third phase corresponding to support after treatment. Therapeutic education is performed using various instruments and methods specifically adapted to the needs and expectations of individual patients. Upcoming treatments for hepatitis C, with evidence for high efficacy, few side effects, and shorter duration, will certainly change the landscape of adherence and the management of therapeutic education.

Introduction

Infection with the hepatitis C virus (HCV) represents one of the commonest chronic infectious diseases, estimated to affect 170 million patients worldwide. It is a leading cause of chronic liver disease and is associated with a high risk of developing cirrhosis and hepatocellular carcinoma.1–3 HCV infection is related to various genotypes, with genotype 1 being the commonest in many parts of the world.1–3

For the past decade, the current standard-of-care treatment for chronic hepatitis C has been based on a bitherapy that combines peginterferon (PEG-IFN)-2a or -2b and ribavirin (RBV) for 24–48 weeks. This treatment is associated with a sustained virological response in over 50% of all patients, with variation according to the different genotypes.1–3 In patients with genotype 1 treated for 48 weeks, a sustained virological response was achieved in only 40%–45%.1–3

Since 2011, a triple therapy combining PEG-IFN/RBV and telaprevir (TVR) or boceprevir (BOC), which are NS3/4A protease inhibitors (PIs), has become the new standard of care for treatment of genotype 1 HCV infection and is associated with a 30% increase in sustained virological response.4–7 Despite this marked improvement, there are still many treatment failures and unmet needs.8 The major cause of therapeutic failures with bitherapy and triple therapy is ascribed to poor adherence.8–11 First, it is important to define what is meant by adherence. Usually, adherence refers to how closely the patient follows the treatment regimen as recommended by the care provider with respect to timing, dosage, and frequency.12 There are several nonadherence definitions that correspond to missed doses, involving either the care provider or the patients themselves.12 Herein, we will consider only patient-driven adherence and exclude nonadherence issues related to the absence of response to antiviral treatment, which results from the characteristics of the virus and the host immune system.12–14

The purpose of this review is to analyze and discuss the factors that modulate patient-driven adherence to treatment of HCV infection, the impact on health-related quality of life (HRQOL), and a means of improvement for treatment – in particular, through therapeutic education (TE).

Patient-driven adherence to treatment of HCV infection

The adherence of the patient during HCV infection and its treatment is modulated by various parameters.9–20

Conditions for receiving the treatment

The conditions for receiving the treatment may be unfavorable for the following reasons:

Poor baseline knowledge of the disease and its transmission: route of contamination, natural history of HCV infection, symptoms, and risks of complications – in particular, cirrhosis and hepatocellular carcinoma.15

Poor knowledge of factors that aggravate HCV infection: comorbidities including drug addiction, alcohol abuse, obesity, metabolic syndrome, diabetes, and others.10–12,15–19

Poor social conditions: lack of familial support; difficulties with, for example, environment, occupation, social security, and insurance.12–18

Poor knowledge of the antiviral treatment: purpose of the treatment; potential health benefits; drugs used for antiviral effects (PEG-IFN/RBV and, for genotype 1, antiproteases); route of administration; duration of treatments; side effects; risk of drug interactions with co-medications; judgment of efficacy; tolerance; and other factors.12–15,20

Difficulties in taking the treatment. This point is particularly illustrated by triple therapy, which requires numerous pills at inconvenient times with fatty meals, in addition to other drugs used to control side effects and other potential diseases, as well as subcutaneous injection of interferon.4–8

Tolerance of the treatment

Treatment of HCV infection tolerance is variable from one patient to another and in ways that are not always predictable. Nevertheless, the side effects of the treatment are generally constant and sometimes very severe.1–3,8–11 These side effects represent the main reason for dose reduction and premature discontinuation of therapy.1–3,8–11

Indeed, in the pivotal clinical trials for bitherapy, PEG-IFN alpha-2a or -2b/RBV, adverse effects from the drugs were the primary cause for 10%–14% of the premature discontinuations of the treatment and for 32%–42% of the dose modifications.1–3,9 The duration and/or dosage of therapy (PEG-IFN alpha/RBV) were inferior to 80% of assigned treatment regimens in 21.6%.10 Prospective studies performed thereafter in a real-life setting (with patients not selected according to the very restrictive criteria of clinical trials) have shown that adequate adherence was decreased to 60% because of adverse side effects.11,21

The main side effects that affect adherence have already been extensively reviewed.8–11 Briefly, the main side effects of PEG-IFN are marked asthenia, flu-like syndrome, neutropenia, infections, thrombopenia, sleep alteration, and, especially, depression or other psychiatric disorders (in 15%–60%).8–11,21–25 The main side effects of RBV are marked anemia, skin reactions, digestive disorders, and weight loss.8–11,22 The safety profile of triple therapy with PIs reflects the known profile of PEG-INF/RBV. The addition of PIs is responsible for incremental anemia and dysgeusia with BOC and incremental anemia, frequent skin reactions, renal failure, and gastrointestinal disorders with TVR.4–7 Discontinuation of treatment owing to adverse events ranged from 8%–16% with BOC-based triple therapy and from 10%–15% with TVR-based triple therapy in Phase III trials.4–7 Side effects of triple therapy have been specifically evaluated in cirrhotic patients with a previous viral response failure to bitherapy in a real-life setting in the French Agence Nationale de la Recherche sur le Sida et les Hépatites (ANRS) CO20 Compassionate Use of Protease Inhibitors in viral C Cirrhosis (CUPIC) study.26 During the first 16 weeks of treatment with BOC or TVR, death occurred in 1.3%–2.0% of the cases, serious adverse events in 38.4%–48.6% of the cases, discontinuation for serious adverse events in 7.4%–14.5% of the cases, hepatic decompensation in 4.4% of the cases, marked anemia in 29.7%–32.7% of the cases, infection grade 3/4 in 2.5%–8% of the cases, and rashes of grade 3 in 6.8% and grade 4 (severe cutaneous adverse reactions) in 0.7% of the cases in patients receiving TVR treatment.26 This study revealed that a baseline albumin level below 35 g/L or platelet count below 100,000/mm3 or their combination are predictive factors of severe complications with triple therapy.26

Impact of HCV on HRQOL

Health is not only the absence of disease: it has been defined by the World Health Organization (WHO) as a concept integrating the notion of well-being in all domains of life (physical, mental, emotional, social, and spiritual).27

HRQOL refers to a patient’s subjective assessment and includes a range of conditions that can affect the patient’s perception of their state of health.28 The perception of HRQOL varies between individuals and is dynamic. HRQOL is not necessarily difficult to measure, but it does rely on patient self-report and is a subjective experience.28 Usually, HRQOL data are obtained directly from the patient through an auto-questionnaire. Less frequently, the questionnaire is completed with the help of a care provider.28,29 The perception of HRQOL by the patient is not based on medical criteria such as laboratory values or evaluation of the degree of inflammation and fibrosis of the liver. Therefore, HRQOL is not always correlated with the severity of hepatitis C. Individuals who present the same clinical picture may have different expectations and report different quality of life.28

Methods for the assessment of HRQOL in HCV patients

Because of the complexity in determining HRQOL, various methods have been developed to assess the data. Different instruments and questionnaires, classified as generic or specific, have been proposed.28 Generic instruments are widely used and allow comparisons of different diseases and populations;28 however, generic instruments exhibit a number of limitations, of which the most important is that they do not allow specific aspects of a disease to be studied.28 For this reason, specific methods for assessing HRQOL are increasingly being developed.28 Currently, there are a number of specific questionnaires available regarding liver diseases – in particular, hepatitis C.28,29

Generic instruments

The Medical Outcomes Study Short-Form 36 (SF-36)30 is an auto-questionnaire that calculates a profile of HRQOL. It comprises 36 questions that evaluate eight subgroups of health: physical activity; life and its relationship with others; physical pain; health perception; vitality; limitations due to psychological state; limitations due to physical state; psychological health; and health evolution. A new SF-36 version, specifically adapted to diseases such as hepatitis C, has been proposed,31 as it has a detailed questionnaire including 69 parameters and a specific scale for HCV.29

The Nottingham Health Profile is a general auto-questionnaire.28

The Sickness Impact Profile is a questionnaire, comprising 136 parameters, that is used infrequently.32

Fatigue state has been specifically evaluated by auto-questionnaires, that evaluates the impact of fatigue on physical, cognitive, and psychological domains, as well as by a visual analog scale.33

Social Functioning Questionnaire is a questionnaire that allows evaluation of professional activity.34

Health Utilities Index Mark 2 and Mark 3.34,35

Specific instruments

Specific instruments adapted to chronic liver disease and hepatitis C include: the Chronic Liver Disease Questionnaire;36 the Liver Disease Quality Of Life questionnaire;37 the Hepatitis Quality of Life Questionnaire;38 and The Nottingham Health Profile, supplemented and validated by another questionnaire specific for hepatitis C, the Indicateur Spécifique de Montpellier.39

HRQOL modifications relating to the period of assessment

HRQOL in patients with chronic HCV infection out of treatment

Several studies have revealed changes in HRQOL in patients with chronic HCV infection out of treatment compared to that of the control group.30,32,40–42 The notion of HCV contamination may alter the HRQOL of the patient because of the anxiety generated by the idea of contamination, its consequences on daily life, and its associated health risks.28,40 Fatigue is a very frequent symptom.33,41 Among patients with chronic hepatitis, those with HCV exhibited a significant alteration in SF-36 scores compared to patients infected by hepatitis B virus, with particularly low scores for mental function.41 Age and sex do not seem to play a role in HRQOL changes.29 HCV genotype and viral load are not associated with the level of fatigue responsible for the decrease in HRQOL.42,43 The severity of the histological lesions and transaminase elevation are also not correlated with changes in HRQOL.29 However, extrahepatic manifestations related to HCV – in particular arthralgia, paresthesia, myalgia, fibromyalgia, pruritus, and dry syndrome – do alter the HRQOL.43

Comorbidities may also affect HRQOL.29 SF-36 scores are correlated with past history of psychiatric disease or existence of addiction and somatic problems.29 HRQOL changes might also be caused by an effect of HCV on the brain,44 as there are data that suggest the presence of HCV in the central nervous system.45 Alteration of cognitive function has been reported more frequently in patients with minor chronic hepatitis compared to controls in recovery. This alteration was correlated with functional abnormalities in the brain as observed by magnetic resonance.44 However, addictive behavior and decompensation of cirrhosis appear to play more important roles than functional abnormalities of the brain in cognitive alteration in subjects contaminated by HCV.29,46,47

HRQOL during treatment of HCV infection

The HRQOL in patients treated by interferon alone or in association with RBV decreases during the treatment, with SF-36 scores markedly decreasing within the first weeks of treatment.21,28–30,34,48–51 The most affected domains are physical activity, vitality, social function, and impact on emotion in social life.34 The alteration is more significant in the physical domain when interferon is associated with RBV. Bitherapy has been associated with a 50% decrease in professional productivity and work capacity.34 In a European study with treatment by interferon alone, 25% of the patients stopped their professional activity for 2 months, within the first trimester of treatment. If treatment was continued, 15% of the active patients stopped their professional activity for 2 additional months.21

Finally, it is interesting to note that HRQOL alteration may be very differently evaluated by the patient than by the physician.31,41

HRQOL in patients with eradication of HCV after treatment

The first studies performed in patients with a sustained virological response after treatment by interferon alpha alone showed a high improvement in HRQOL after treatment of HCV infection.31,41,42 These results have been confirmed by a study associating interferon alpha and RBV with an improvement in practically all domains of the SF-36 in patients with a good virological response, but no amelioration in virological nonresponders.30 However, even in patients with good responses, the improvement in HRQOL was not complete. Indeed, in this study, 33% of patients described a limitation in their social activity (53% before treatment), 40% remained tired (66% before treatment), and 20% exhibited limited professional activity (43% before treatment).30 Similar results were observed in another study.52

HRQOL improvement in patients with a sustained virological response may be related to the psychological effect associated with therapeutic success. However, in another study, the improvement of HRQOL in subjects with a chemical response, but without information on the virological response, was significantly better if the virological response had actually occurred.42 In a study comprising 912 patients randomly treated with interferon alone or in association with RBV, these results were confirmed.34 Before treatment, significant changes were observed in five of the eight domains in the SF-36; patients with a sustained virological response exhibited normalization in four of these five scores, which was not observed in the nonresponders.34 Similar results were observed in 1,441 patients, with or without cirrhosis, included in three randomized studies comparing PEG-IFN alpha-2a and standard interferon alpha-2a: patients with a good virological response exhibited an improvement in their HRQOL and a decrease in fatigue.52 In patients with cirrhosis, the improvement was mainly noted for the physical component. The lowest improvement seen was in the mental component, which might be explained by the persisting risk of complications associated with the cirrhosis.52

These results confirm that HCV eradication is associated with HRQOL improvements in its different domains: emotional, physical, and mental. However, normalization is not fully observed. In particular, asthenia may persist in about one out of three cases. The outcome of psychiatric side effects related to interferon discontinuation has not yet been well documented.

Measures to improve adherence to treatment of HCV infection and TE

Compared to other chronic diseases, HCV infection and treatment exhibit some particularities that deserve to be stressed for a better understanding of adherence difficulties in treatment of HCV infection.1–9 The major points are the following:

The HCV could be eradicated, in contrast with other viruses such as hepatitis B and human immunodeficiency virus (HIV);

The eradication could be obtained with a relatively limited duration of antiviral treatment (24–48 weeks);

In chronic hepatitis C, the treatment induces an immediate worsening in the patient condition, in contrast to the treatment of most other chronic diseases, associated with an improvement in the patient condition;

This worsening is mainly caused by the numerous side effects of the treatment;

Therapeutic failures are mainly related to a lack of adherence to the treatment, which mostly result from the adverse effects of the antiviral therapy; and

The first generation of triple therapy is associated with additional particularities: risk of developing resistance, treatment insufficiency or intolerance because the virus has mutated and now produces antiproteases, and potential risks of drug interactions with other medications.

A decrease in adherence to treatment of HCV infection (bi- or triple therapy) is not limited to hepatitis C. It occurs in most chronic diseases that require long-term treatment.53 The suboptimal adherence observed in clinical trials in selected patients10,54–59 is even more marked in clinical practice.56 In addition, recent studies suggest that suboptimal adherence may also be linked to the patient’s impression that no one is listening to them.60,61

In order to improve adherence and patient counseling while taking into account these specific aspects of hepatitis C, various programs for TE have been developed over the past 15 years.11

Definition and characteristics of TE

Initial definition of TE

In a WHO-Europe report in 1998, TE was defined as follows:

Therapeutic patient education should enable patients to acquire and maintain abilities that allow them to optimally manage their lives with their disease. It is therefore a continuous process, integrated in health care. It is patient-centered; it includes organized awareness, information, self-care learning and psychosocial support regarding the disease, prescribed treatment, care, hospital and other health care settings, organizational information, and behaviour related to health and illness. It is designed to help patients and their families understand the disease and the treatment, cooperate with health care providers, live healthily, and maintain or improve their quality of life.62

Initial programs were based on those developed for other chronic diseases – in particular, HIV, diabetes, cardiovascular diseases, and rheumatic diseases.63–67 The initial objective of TE in hepatitis C was focused on observance of the antiviral treatment and primarily managed by the intervention of nurses.15,68–72

Modern concepts and characteristics of TE

TE should be clearly defined and separated from education for health, although its purpose is similar: to improve the ability to maintain and develop health. However, the teaching practices are not similar. In TE, pedagogic choices should promote competence in maintaining healthy practices, as well as a respect for this healthy state. This double process is the major difficulty in the educative relationship. Living with a chronic disease requires that the patient obtains knowledge of the disease and its treatment and skills of auto-observation, auto-follow-up, auto-supervision, and auto-adaptation of the treatment according to the various circumstances of their life. Consequently, the subject is confronted with the necessity of having an active and permanent role in their recovery process. This modification in the patient status necessitates that the health care providers (physician, nurse, etc) change their behavior, which is frequently instructive and paternalistic, in the search of a true partnership. This new dimension to the relationship does not change the medical responsibility and always relies on a pact of confidence, with the aim of permanently clarifying the intention and role of each partner. Consequently, education and care of patients with a chronic disease are complementary activities. The notion is that health should be considered as a complex good, leading patients to behave as the health producer, making their own therapeutic choices.73–75

Finally, TE should be understood as the acquisition of decisional, technical, and social competency, with the purpose of making the patient able to make health choices, realize their own life plans, and use health care resources in the best manner. The patient should become able to recognize and interpret signs of health complications, for example, symptoms of anemia, early signs of depression, nutrition issues, and any skin reactions.73–75

Beyond these general concepts, TE should be adapted, not only to hepatitis C, but also to the cultural patterns of the patient and their country, their religion, and the rules in the society in which they live.73–75

Specific organization of TE in hepatitis C

The patient is placed in the center of an organization, comprising various care workers who include social service professionals and medical staff.72 For hepatitis C, TE may be separated into three phases.

First phase: educative diagnosis

This period starts just after the discovery and announcement of HCV infection to the patient. The TE team may make the first evaluation of the patient, with parameters shown in Figure 1 and Table 1, and perform the educative diagnosis (for example, providing knowledge to the patient of the disease and treatment; evaluation of their professional and social environment; and evaluation of the hepatic and extrahepatic consequences of HCV infection, comorbidities, potential addictions, and their will with regards to the TE team).73–75

Figure 1

Organization of TE.

Abbreviations: HRQOL, health-related quality of life; TE, therapeutic education.

Table 1

Studies assessing the efficacy of TE in the treatment of HCV infection

Study	Study type	Number of patients in TE/control group	HCV genotype and treatment experience	Results: adherence with TE versus in control group	Results: sustained virological response with TE versus in control group
PEGOBS protocol15,72	Multicentric, controlled, randomized study;TE by nurses	123/121	All genotypes; naïve responders/nonresponders to a previous treatment	74.0% vs 62.8%; P=0.06Expert-center 83.1% vs 61.9%; P=0.007	38.2% vs 24.8%; P=0.02Expert-center 47.7% vs 23.8%; P=0.004
CHEOPS study68	Prospective, observational, nonstandardized study; TE	370/304	Genotype HCV 2/3; naïve responders/nonresponders to a previous treatment	61% vs 47%; P=0.001	77% vs 70% (TE); P=0.05
Renou et al69	Controlled, nonrandomized study;TE by nurses	98/326	All genotypes; naïve responders/nonresponders to previous treatment	–	71.4% vs 53.3%; P=0.001
Bernard-Leclerc et al70	Monocentric, prospective, uncontrolled, nonrandomized observational study;TE by nurses	17	All genotypes: naïve responders/nonresponders	90.6%	12/17 (70.5%)

Abbreviations: HCV, hepatitis C virus; TE, therapeutic education; vs, versus.

Various tools have been developed to collect this type of information, comprising specific auto-questionnaires and questionnaire-guided interviews built by health professionals, patients themselves, and an association of patients who are part of the TE team. Obviously, these tools must be adapted to the specific cultural characteristics of the patient.73–75

Next, a synthesis of the patient situation may be done by the TE team to define their needs and design proposals for subsequent care. The conclusions and proposals are extremely variable, ranging between two extremes. The first is that HCV infection has no significant impact on the health and social life of the patient nor on their HRQOL; the patient may express no request of care or assistance, deny treatment, and just want to know how to organize the follow-up. At the other extreme is a patient with an unquestionable need for HCV treatment but in an extremely difficult situation to undergo treatment and with many other priorities. This patient may be homeless and/or have no job; no social security; severe addictions; comorbidities; and no will to start a difficult-to-realize treatment. The priority will be to evaluate how to improve these difficulties before engaging the patient in treatment.

If an antiviral treatment is indicated, the needs for achievement of the best condition should be evaluated at this stage to define the role of each health care member and prepare the patient and their personal environment (parents of the patient). The baseline HRQOL level must be assessed for further comparisons. When the appropriate conditions are obtained for treatment, the parameters of the second step should be considered.73–75

Second phase: support during treatment

The patient should have received the appropriate education to perform the treatment while in good condition (learning to inject PEG-IFN via a subcutaneous route and to take tablets of RBV and antiproteases on the appropriate schedule; learning about the probable or possible side effects of each component of the treatment and how to improve them by themselves).72–75

The calendar for visits, biological and virological controls requiring blood samples, and any other necessary examinations (ultrasound examination in cirrhotic patients) should be clearly indicated, by, for example, using a therapeutic booklet. This booklet should contain the relevant contact information (ie, phone numbers and email addresses) of the TE partners. Documents regarding HCV infection (ie, its potential consequences and treatment) that are specifically designed for the patients are also very useful.

The coordinator of the TE should evaluate how well the treatment is taking place with respect to medical appointments; biological and virological controls requiring blood samples; adherence to treatment; virological and biochemical responses to treatment; side effects; perceptions; modifications in the HRQOL of the patient and their family; social consequences; and any requirement for new educative actions or specific measures. The health providers usually have tools, such as specific questionnaires, to aid in this information collection.

The evaluations are performed step-by-step up to the end of the treatment, allowing for potential modifications to the treatment: modification of the antiviral dosage, sometimes premature discontinuation, and prescription of treatments (eg, pain killers, antidepressants, erythropoietin, alimentary supplements, treatments for skin reactions) for side effects.

Third phase: support after treatment

There are two situations that vary according to the response to the treatment.72–75

Treatment failure

The patient is very vulnerable in this situation, usually with a feeling of deception and absence of reward, despite their efforts to deal with difficulties and side effects. The confidence in the team may be decreased and the patient may be discouraged, thinking that they will never get rid of the virus and that the treatment might have been a bad decision.

In this circumstance, one may stress that many new treatments (with more than 20 molecules, including new antiproteases, anti-NS5A, and polymerase inhibitors) are under development, with evidence of high efficacy (90%–100%), few side effects with shorter duration,76–79 easy to take, in particular with oral treatments without interferon or RBV.76–79 The first marketing authorizations have been obtained for Sofosbuvir.77–79

Virological recovery

At this stage, there may be a discrepancy between the perception of the patient and that of the health team. From a medical point of view, the perspective may appear very positive: the viral infection has definitely disappeared, liver tests have normalized, and the long-term risks have disappeared. However, for the patient, the perception may be very different. In fact, the disappearance of the virus does not mean recovery from the disease. There are scant data illustrating long-term evaluation of patients after viral recovery. A recent prospective study suggested that patients with a sustained virological response more frequently exhibit obesity and cardiovascular risks.80 This risk is correlated with the number of previous treatments.80

One should verify the health of the patient in all of the HRQOL domains: disappearance of liver disease and side effects of the treatment, restoration of social life, and improvement in their HRQOL.

In patients with cirrhosis, it is very important to underline that, although the risk of complications (hepatocellular carcinoma, bleeding from esophageal and gastric varices, portal vein thrombosis, etc) may have decreased with the viral suppression and the disappearance of liver inflammation, may have not altogether disappeared.8 Thus, a regular follow-up remains necessary.8

Instruments and methods for TE

Numerous instruments and methods have been developed.74,75

Meetings

Meetings with the patient are necessary in order to listen to the patient and assess their personal evolution with regard to their disease and treatment. Listening is fundamental and is a long and complex process that requires specific training.

Individual meetings

In general, initial meetings are done on an individual basis, with the care provided according to the educative diagnosis and, later, according to the situation of the patient with other members of the TE program. The presence of family members is desirable because they will be strongly involved in the disease and its treatment.

Collective meetings and workshops

It may be useful and encouraging for the patient to participate in collective meetings driven by specific topics.

Instruments

There are numerous guiding questionnaires, brochures, relevant cartoons, pictures, informational movies (on the disease, its treatment, and its prevention), testimonies by care providers or patients, and internet websites that can steer the patient to validated medical information and adequate social networks that may help them during their treatment.

Choice of method and instruments

One should avoid locking the patient into a particular course and instead take into account the advantages of each approach for their specific needs.

Published experiences with TE in the management of hepatitis C

There are a few published studies that assess the efficacy of TE in treatment of HCV infection which is mostly managed through the intervention of a nurse.15,69–72 The organization, experimental design, and results of these studies are summarized in Table 1. These studies demonstrate that TE is associated with an improvement in adherence to the treatment and a higher virological response.15,69–72 In PEGOBS, a single prospective, randomized, and multicenter study with a well-defined methodology, the beneficial effects were particularly observed in the most difficult-to-treat patients, who required 48 weeks of bitherapy,15 and are correlated with the experience of the nurse in question.72 Also, the PEGOBS study revealed that systematic TE in such conditions is associated with changes in the HRQOL in the emotional domain.73 Albeit positive, these experiences revealed that TE should not be limited to nurse intervention, but also rely on a more diversified team during treatment, comprising social care providers, pharmacists, physiotherapists, nutritionists, and specialists in addictology, as well as general practitioners, the patients themselves, and their families.15

Conclusion and perspectives

Chronic hepatitis C is unique among chronic diseases, because one may completely recover with a short-term treatment. The currently available treatments are associated with high efficacy, but are complex and associated with important side effects that are key points for the adherence and success of the treatment. Thus, the treatment triggers an alteration in the quality of life. Therefore, support by TE is essential at the different phases of hepatitis C therapy: that is, before, during, and after treatment.

Many new treatments, with evidence of high efficacy, few side effects, and shorter duration, are upcoming. Indeed, the first marketing authorization has been obtained with sofosbuvir and will be obtained for other drugs in 2014.77–79 These new treatments, which are easier to maintain, will certainly change the landscape of adherence and the management of TE for HCV patients.