Budget impact analysis of ustekinumab in the management of moderate to severe psoriasis in Greece
- Georgia Avgerinou†3,
- Ioannis Bassukas†1,
- Georgios Chaidemenos†2,
- Andreas Katsampas†3,
- Marita Kosmadaki†3,
- Hara Kousoulakou8Email author,
- Athanasios Petridis†1,
- Brad Schenkel9,
- Dimitrios Sotiriadis†4,
- Theofanis Spiliopoulos†5,
- Panagiotis Stavropoulos†3,
- Evgenia Toumpi†6 and
- Loukas Xaplanteris7
© Avgerinou et al.; licensee BioMed Central Ltd. 2012
Received: 1 December 2010
Accepted: 25 July 2012
Published: 25 July 2012
The purpose of this study was to estimate the annual and per-patient budget impact of the treatment of moderate to severe psoriasis in Greece before and after the introduction of ustekinumab.
A budget impact model was constructed from a national health system perspective to depict the clinical and economic aspects of psoriasis treatment over 5 years. The model included drug acquisition, monitoring, and administration costs for both the induction and maintenance years for patients in a treatment mix with etanercept, adalimumab, infliximab, with or without ustekinumab. It also considered the resource utilization for non-responders. Greek treatment patterns and resource utilization data were derived from 110 interviews with dermatologists conducted in February 2009 and evaluated by an expert panel of 18 key opinion leaders. Officially published sources were used to derive the unit costs. Costs of adverse events and indirect costs were excluded from the analysis. Treatment response was defined as the probability of achieving a PASI 50, PASI 75, or PASI 90 response, based on published clinical trial data.
The inclusion of ustekinumab in the biological treatment mix for moderate to severe psoriasis is predicted to lead to total per-patient savings of €443 and €900 in years 1 and 5 of its introduction, respectively. The cost savings were attributed to reduced administration costs, reduced hospitalizations for non-responders, and improved efficacy. These results were mainly driven by the low number of administrations required with ustekinumab over a 5 year treatment period (22 for ustekinumab, compared with 272 for etanercept, 131 for adalimumab, and 36 for infliximab).
The inclusion of ustekinumab in the treatment of moderate to severe psoriasis in Greece is anticipated to have short- and long-term health and economic benefits, both on an annual and per-patient basis.
Psoriasis is a chronic, currently incurable, inflammatory skin disease. It is characterized by relapses and remissions, and is affected by several genetic and environmental factors . Estimates of the worldwide prevalence of psoriasis range from 0.5% to 4.6% , with males and females being equally affected . In Greece, the relative prevalence of psoriasis is 2.8% based on an 8-year prevalence study in an outpatient setting of a general state hospital dermatological teaching clinic . Ethnic variations have been identified and Caucasians are more likely to suffer from the disease. The median age of onset is 28 years .
The most common type of psoriasis, occurring in more than 80% of cases, is plaque psoriasis or psoriasis vulgaris, characterized by well-demarcated erythematous scaly plaques . Thirty-five percent of those with plaque psoriasis suffer from moderate to severe disease , which is usually defined as psoriasis affecting at least 10% of body surface area or a Psoriasis Area and Severity Index (PASI) score of 10 or more .
The chronic and incurable nature of plaque psoriasis indicates that it has a major social and economic impact on the community . The psychological impact of psoriasis can be profound. The extent to which psoriasis affects a person’s health-related quality of life (HRQoL) is similar to that of other chronic diseases, such as arthritis, chronic lung disease, and type 2 diabetes . Those with more severe psoriasis experience similar levels of anxiety to patients with conditions such as breast cancer, osteoporosis, or metastatic prostate cancer [8, 9]. In a US study of 265 adults with psoriasis, 32% screened positive for depression and there was a graded relationship between depressive symptoms and HRQoL impairment (P < 0.001). More than 16% of those with high depression scores were treated with antidepressant medication. Both dissatisfaction with psoriasis treatment and illness-related stress were highly associated with depression . Many people with psoriasis report moderate to severe feelings of stigmatization, anxiety, anger, and depression . Increasing severity of psoriasis is closely correlated with suicidal ideation [12, 13].
The annual, per-patient direct cost of psoriasis has been reported to be more than $14,600 in the US , £3,800 in the UK , and more than €5,000 in Italy . The economic burden of psoriasis has not yet been evaluated in Greece.
One of the goals of psoriasis therapy is to reduce or clear plaques and induce remission . The ideal therapy is an efficacious, long-lasting agent that is devoid of acute or long-term adverse effects, with minimal monitoring requirements and a dosing regimen that facilitates adherence . These characteristics may help to reduce treatment costs while maintaining improvements in patients’ HRQoL [18, 19].
Currently available systemic treatments for moderate to severe psoriasis include conventional drug therapies (cyclosporine, methotrexate, retinoids, and phototherapy) and biologics. The former have demonstrated varying degrees of efficacy, and long-term use can lead to serious side-effects . In addition, systemic therapies lack durable efficacy (the symptoms of psoriasis recur shortly after withdrawal of conventional therapies) and have inconvenient administration schedules (e.g., daily dosing, multiple weekly exposures) .
On the other hand, the available biologic agents (infliximab, etanercept, adalimumab, and ustekinumab) provide specific, targeted regulation of the cells in the immune system and pathophysiologically designed intervention in the immunological disease cascade of psoriasis. They thus offer a treatment choice for patients who have moderate to severe disease where “conventional” systemic treatments have failed, are contraindicated, or not tolerated .
The primary safety concern with biologic agents is immunosuppression. Biologic agents are associated with increased risk of infection, serious infection and possibly malignancies . The safety of biologic agents compared with conventional therapies for the treatment of psoriasis has not yet been precisely defined .
Ustekinumab is the most recent biologic agent to come to market. It was approved in Europe in January 2009 and has been shown to be well tolerated, to improve moderate to severe psoriasis, and to have a favorable administration and monitoring schedule (one subcutaneous injection every 12 weeks during the maintenance period) [23, 24]. Moreover, in the Phase 3 randomized clinical trials, the PASI 75 results achieved with ustekinumab were sustained through at least 52 weeks [25, 26].
The objective of this study was to estimate the annual and per-patient budget impact of the introduction of ustekinumab as a treatment alternative for patients with moderate to severe psoriasis in Greece, and to test the hypothesis that a treatment with improved risk–benefit and administration profiles compared with existing treatments can lead to cost savings.
An economic model that estimated the annual and per-patient budget impact of ustekinumab was built in Excel 2007. The budget impact model estimated the impact of introducing ustekinumab into the treatment mix of biologic agents available for the treatment of moderate to severe plaque psoriasis in Greece, by comparing the costs incurred by the national health system before and after the introduction of ustekinumab.
All available biologic agents for the treatment of moderate to severe psoriasis in Greece, namely ustekinumab, etanercept, infliximab, and adalimumab, were included in the model as treatment options. Efalizumab was excluded from the analysis as its European marketing authorization was suspended in February 2009.
The economic analysis was performed from a national health system perspective. The model time frame was 5 years (base year 2009), during which the prevalence of psoriasis was assumed to be constant. The treatment response to biologic therapies was measured in terms of the probability of achieving a PASI 75 response, and the annual costs and resource utilization of both responders and non-responders to biologic treatment were considered in the model.
Mean percentage of patients achieving PASI 75 response with psoriasis biologic treatments
Resource utilization data
Data on medical resource use were collected through face-to-face interviews with dermatologists, the results of which were validated by an expert panel of 18 dermatologists.
The interviews were undertaken during January–March 2009 and included two stages. The first stage involved 5 minutes of computer-assisted telephone interviews (CATI), which aimed to identify dermatologists who were eligible for the second stage of the survey. CATI participants were randomly selected through a database including contact details for all registered members of the Hellenic Society of Dermatology and Venereology, which is publicly available on the official website of the society (http://www.edae.gr/). Randomization was based on market research techniques and resulted in a total of 200 dermatologists, who were both office and hospital based, and were from Athens, Thessaloniki (Salonica), and other urban centers.
Distribution of the 110 interviewed dermatologists by place of work and area
Place of work
Number of dermatologists
Other urban centers
A 40-item questionnaire (both quantitative and qualitative) was developed with the aim of exploring: a) epidemiologic data (number of patients with plaque psoriasis, percentage of patients with moderate to severe disease); b) treatment pathways (percentage of patients receiving pharmaceutical treatment, percentage receiving monotherapy versus combined treatment, percentage receiving biologic agents versus conventional systemic therapy); and c) resource utilization of both responders and non-responders (frequency and setting of administration, number of annual outpatient visits to physicians’ offices and hospitals, duration of hospitalizations) (see Additional fileAdditional file 1: Primary research questionnaire). Non-responders were defined as patients who did not achieve a PASI 75 response.
The interviews were based on a retrospective analysis on the use of biologic agents and on a hypothetical projection regarding the use of ustekinumab. In particular, the dermatologists were asked to consider their workload over the last month and provide information on moderate to severe psoriasis epidemiology and resource utilization based on their own experiences. The aim was to gather information on usual practice as opposed to best practice, as the former is more informative for determining the actual costs of treatment.
All data collected in the interviews were validated by an expert panel of 18 key opinion leaders in dermatology, who were selected on the basis of being either distinguished academics or managers of psoriasis treatment centers. The experts included in the panel represented all major geographic regions of Greece. No Ethics Committee approval was requested for the primary research component of the study, as the conduct of interviews with physicians and Experts' Panel are not subject to any approval according to the Greek legislation.
The questionnaire used during the expert panel procedure was the same as that used in the interviews. The findings from the original interviews were projected on a screen and the expert panel was asked to either confirm or reject them using a tele-voting system. If more than 60% of the experts disagreed with the findings of the fieldwork, they were invited to answer the same question based on their experience. The average of the experts’ answers was then included in the model. The experts’ opinions were also used to inform the model on the market shares of the biologic agents, with and without ustekinumab.
Economic evaluations should go beyond the acquisition cost of drugs in order to reflect real-life clinical practice. Costing in this way requires that all resources used by a particular program or treatment are identified and valued.
To health economists, cost refers to the sacrifice of benefits made when a given resource is consumed in a program or treatment – in other words, the opportunity cost. The value of opportunity forgone in the next-best alternative use of health resources does not necessarily equate to the market price of the resources used, because the total costs of treatment should be considered. The total costs comprise the sum of all expenditures during a given time frame, including the direct costs incurred by the health care provider and patient, as well as the indirect costs to society of productivity lost. It is important to assess the relative importance of a cost item to the overall outcome, since the inclusion of minor costs may not be justified in certain cases. An example is when the cost of drug acquisition (a direct cost) far outweighs the magnitude of other costs, such as productivity loss (an indirect cost). Thus, in this model, only direct costs expressed in euros (2009) were considered.
Costs incurred during the maintenance years of therapy were not discounted. The costs associated with the management of adverse events were not incorporated in the model, as they were assumed to be the same across the biologics compared.
Dosing scheme per product used in the analysis
80 mg at week 0, 40 mg at week 1, then 40 mg every other week
50 mg twice weekly for 12 weeks, then 50 mg once weekly
5 mg/kg at weeks 0, 2, and 6, then every 8 weeks
45 mg at weeks 0 and 4, then every 12 weeks
Prices of the biologics were taken from officially published price bulletins from the Ministry of Development (http://www.ypan.gr). Tariffs from the largest social health insurance fund (http://www.ika.gr) were used to assess monitoring (outpatient visits to dermatologist), administration (visits to nurse, day hospital, or dermatologist’s private office), and inpatient costs.
In order to capture the total health care costs for the treatment of psoriasis, the type of costs considered in this analysis incorporated not only drug acquisition costs but also associated medical resource use costs, including resource costs for non-responders such as supportive care, outpatient visits, and hospitalization.
From a health care system perspective, office visits represent a substantial usage of health care infrastructure and are therefore an important component of fixed health care costs. For this reason, dispensing fees, administration costs, and office visits are commonly factored into economic analyses in the economic evaluation literature. This has been the preferred approach in numerous studies, even though the charges for administration costs may not necessarily differ between the therapies being compared (e.g., multivalent vaccines and infusion cancer therapies, in which office visits and administration costs are critical components of the economic analysis) [29, 30]. This approach has been endorsed by the “Good Research Practices for Measuring Drug Costs in Cost Effectiveness Analyses” developed by the International Society for Pharmacoeconomics and Outcomes Research . This document indicates that the administration cost of a medication is an integral part of the overall cost of treatment and, in fact, economic evaluations should go beyond the acquisition cost of drugs in order to reflect real-life clinical practice.
In order to assess the impact of uncertainty of various model inputs on the results of the study, univariate sensitivity analyses were conducted on three variables that contributed to the cost of treatment and that were derived from the expert panel: hospitalization for non-responders; supportive care costs for non-responders; and market share of ustekinumab. Non-responders’ health care costs were varied, with the variation attributed to differences in resource use (i.e., the number of inpatient and outpatient visits). These costs were allowed to vary by ±10% in one-way sensitivity analyses, whereas the market share of ustekinumab for years 1–5 was allowed to vary by ±3% and ±6% (the latter being equally distributed to or withdrawn from all other biologic agents).
Primary research results
Interviews with dermatologists and the expert panel validation that followed showed that 8% of patients with skin disease visiting a dermatologist are diagnosed with psoriasis. Of patients with psoriasis visiting a dermatologist, 63% have moderate to severe disease; of these, 28% are eligible for biologic therapies.
Administration setting (%) for biologic agents
Dermatologist’s private office
Nurse at home
Alone at home
Health center/private clinic
Annual number of visits to health care professionals (excluding visits for administration)
Dermatologist’s private office
GP’s private office
Mean annual number of visits to dermatologists, by severity of disease and work location of the dermatologist
Mean annual number of additional visits for non-responders to biologic agents
Mean number of additional visits
Dermatologist’s private office
GP private office
Estimated market share (%) of biologic agents for the treatment of moderate to severe psoriasis
Number of administrations for each product
5 year total
Sensitivity analysis of net budget impact of ustekinumab per patient (€)
Non-responders’ outpatient costs
Non-responders’ hospitalization costs
In addition, even using the more conservative base-case market share assumption for ustekinumab (−10%), the introduction of ustekinumab as a treatment option for moderate to severe psoriasis is predicted to deliver substantial annual cost savings per patient, ranging from €254 in year 1 to €665 in year 5.
Moderate to severe psoriasis is a chronic, incurable disease, with substantial economic consequences for the health care budget. This is the first study to investigate the treatment patterns and resource utilization of psoriasis in Greece and the economic impact of the introduction of a new biologic treatment option.
The current study consisted of two parts: field work with questionnaires to dermatologists to identify resource use data; and a budget impact model to estimate the costs associated with adding ustekinumab to the current treatment options for psoriasis. The collection of resource use data through face-to-face interviews with physicians, rather than being derived from clinical trials or observational studies, could be criticized on the grounds of subjectivity and be considered a limitation of this study. However, in order to strengthen the validity of the data collected, an expert panel consisting of key opinion leaders was set up to assess the primary results.
The selection of dermatologists to participate in the primary research was mainly based on the level of experience they had with psoriatic patients, the rationale being that physicians with more experience on psoriasis would be able to provide more robust estimates for the parameters investigated in the study. As a result, the estimated eligible patient population entering the model in year 1 is potentially shifted upwards compared to actual numbers, leading to a subsequent overestimate in the budget impact of the related biologic treatments. However, the results of the present study in terms of cost differences across treatments, are not affected, as the eligible population is the same for all treatments and therefore has a proportionate impact on respective budgets.
The results reveal that etanercept is currently the preferred treatment option for moderate to severe psoriasis, followed by adalimumab and infliximab. An interesting finding is that although etanercept and adalimumab are administered at home for the majority of patients, patients more commonly visit hospital-based physicians than the private offices of dermatologists to monitor their treatment progress. This may be attributed to the fact that specialized psoriasis centers are located in some hospitals.
The results also show that resource utilization and related costs increase with disease severity, a finding confirmed by the literature . Moreover, the investigation of the budget impact of adding ustekinumab as a treatment option for psoriasis shows that this would lead to substantial cost savings, even in the first year of its introduction.
The therapeutic benefits of ustekinumab have been confirmed in three large Phase 3 trials in patients with moderate to severe psoriasis [25, 26, 28]. These studies found that a significantly higher proportion of patients receiving ustekinumab compared with placebo or etanercept achieved PASI 75 at 12 weeks. Other efficacy measures, including the Physician’s Global Assessment at week 12, also favored ustekinumab [25, 26, 28]. Moreover, subcutaneous ustekinumab was generally well tolerated [24–26, 28]. Treatment with ustekinumab has also been found to result in significantly improved HRQoL (Dermatology Life Quality Index) [33, 34], lowered depression and anxiety rates based on the Hospital Anxiety and Depression Scale , and improved employability and productivity .
A possible shortcoming of the present study is that hospitalization and outpatient costs may have been underestimated. Social health insurance fund tariffs, which have been used in this model, do not reflect actual costs; actual costs are higher than the amount reimbursed by insurance funds.
Another limitation is that indirect costs were not considered. Indirect costs related to psoriasis include lost work time (i.e., days missed from work) and reduced productivity. Indirect costs increase with disease severity and can be significant . In a UK study, 59.3% of patients with psoriasis who were still working had lost an average of 26 days from work in the previous year because of their psoriasis, and of the 180 patients not working, 33.9% reported not working because of their psoriasis . A study in Germany showed that the mean indirect costs and loss of productivity per patient with psoriasis were €1,310 per year, accounting for 19.5% of total psoriasis costs . However, clinical trials of biologics, including ustekinumab, demonstrate that patients who respond to treatment experience improvements in productivity and reductions in work-day loss. Therefore, the omission of indirect costs in this analysis is unlikely to adversely affect the research findings.
An important finding of this study is that, based on expert opinion, 67.5% of ustekinumab-treated patients will initially be administered the product in hospital rather than at home or in their dermatologist’s private office. This is probably due to physicians’ reservations regarding a new biologic agent. According to the expert panel, reinforcement of ustekinumab’s efficacy and safety data with local dermatologists’ own experience is likely to lead to patients receiving the drug outside of the hospital setting. The expert panel’s opinion was that similar treatment patterns as with etanercept and adalimumab (where 58% and 60% of patients, respectively, perform administration at home) are expected for ustekinumab users in the future.
Two Phase 3 studies of ustekinumab have shown that the drug has a comparable safety profile with self-administration versus administration by a health care professional [25, 26]. A movement toward more frequent administration at home rather than in the hospital setting could further reduce the direct costs of ustekinumab use.
Overall, the present study investigated, for the first time in Greece, the treatment patterns and resource utilization of patients with moderate to severe psoriasis. These findings may be used to inform the development of national treatment guidelines in psoriasis and health policy resource allocation decisions.
Ustekinumab offers a promising alternative to currently approved biologic agents for psoriasis, with both short- and long-term economic benefits. Based on the present model calculation, the introduction of ustekinumab as an alternative treatment option for moderate to severe psoriasis in Greece is anticipated to bring substantial cost savings to the national health care budget.
- Woolacott N, Hawkins N, Mason A, Kainth A, Khadjesari Z, Vergel YB, et al.: Etanercept and efalizumab for the treatment of psoriasis: a systematic review. Health Technol Assess 2006, 10: No 46.
- Lebwohl M: Psoriasis. Lancet 2003, 361: 1197–1204. 10.1016/S0140-6736(03)12954-6PubMedView Article
- Kyriakis KP, Palamaras I, Pagana G, Terzoudi S, Evangelou G: Lifetime prevalence fluctuations of chronic plaque psoriasis and other non-pustular clinical variants. J Eur Acad Dermatol Venereol 2008, 22: 1513–1514. 10.1111/j.1468-3083.2008.02692.xPubMedView Article
- Stern RS: Psoriasis. Lancet 1997, 350: 349–353. 10.1016/S0140-6736(97)05257-4PubMedView Article
- National Psoriasis Foundation: The psoriasis and psoriatic arthritis pocket guide -Treatment algorithms and management options. , Portland; 2009.
- Yu AP, Tang J, Xie J, Wu EQ, Gupta SR, Bao Y, Mulani P: Economic burden of psoriasis compared to the general population and stratified by disease severity. Curr Med Res Opin 2009, 25: 2429–2438. 10.1185/03007990903185557PubMedView Article
- Rapp SR, Feldman SR, Exum ML, Fleischer AB, Reboussin DM: Psoriasis causes as much disability as other major medical diseases. J Am Acad Dermatol 1999, 41: 401–407. 10.1016/S0190-9622(99)70112-XPubMedView Article
- Chen SC, Bayoumi AM, Soon SL, Aftergut K, Cruz P, Sexton SA, et al.: A catalog of dermatology utilities: a measure of the burden of skin diseases. J Investig Dermatol Symp Proc 2004, 9: 160–168. 10.1046/j.1087-0024.2003.09112.xPubMedView Article
- Zug KA, Littenberg B, Baughman RD, Kneeland T, Nease RF, Sumner W, et al.: Assessing the preferences of patients with psoriasis. A quantitative, utility approach. Arch Dermatol 1995, 131: 561–568. 10.1001/archderm.1995.01690170063009PubMedView Article
- Schmitt JM, Ford DE: Role of depression in quality of life for patients with psoriasis. Dermatology 2007, 215: 17–27. 10.1159/000102029PubMedView Article
- Fried RG, Friedman S, Paradis C, Hatch M, Lynfield Y, Duncanson C, et al.: Trivial or terrible? The psychosocial impact of psoriasis. Int J Dermatol 1995, 34: 101–105. 10.1111/j.1365-4362.1995.tb03588.xPubMedView Article
- Akay A, Pekcanlar A, Bozdag KE, Altintas L, Karaman A: Assessment of depression in subjects with psoriasis vulgaris and lichen planus. J Eur Acad Dermatol Venereol 2002, 16: 347–352. 10.1046/j.1468-3083.2002.00467.xPubMedView Article
- Gupta MA, Schork NJ, Gupta AK, Kirkby S, Ellis CN: Suicidal ideation in psoriasis. Int J Dermatol 1993, 32: 188–190. 10.1111/j.1365-4362.1993.tb02790.xPubMedView Article
- Bhosle MJ, Feldman SR, Camacho FT, Timothy WJ, Nahata MC, Balkrishnan R: Medication adherence and health care costs associated with biologics in Medicaid-enrolled patients with psoriasis. J Dermatolog Treat 2006, 17: 294–301. 10.1080/09546630600954594PubMedView Article
- Cockayne SE, Cork MJ, Gawkrodger DJ: Treatment of psoriasis: day care vs. inpatient therapy. Br J Dermatol 1999, 140: 375–376. 10.1046/j.1365-2133.1999.02691.xPubMedView Article
- Colombo G, Altomare G, Peris K, Martini P, Quarta G, Congedo M, et al.: Moderate and severe plaque psoriasis: cost-of-illness study in Italy. Ther Clin Risk Manag 2008, 4: 559–568.PubMedPubMed Central
- Rich SJ, Bello-Quintero CE: Advancements in the treatment of psoriasis: role of biologic agents. J Manag Care Pharm 2004, 10: 318–325.PubMed
- Finlay AY, Salek MS, Haney J: Intramuscular alefacept improves health-related quality of life in patients with chronic plaque psoriasis. Dermatology 2003, 206: 307–315. 10.1159/000069942PubMedView Article
- Feldman SR, Menter A, Koo JY: Improved health-related quality of life following a randomized controlled trial of alefacept treatment in patients with chronic plaque psoriasis. Br J Dermatol 2004, 150: 317–326. 10.1111/j.1365-2133.2004.05697.xPubMedView Article
- Farhi D, Dupin N: Biologic therapies in the treatment of psoriasis. Presse Med 2009, 38: 832–843. 10.1016/j.lpm.2008.07.023PubMedView Article
- Bongartz R, Sutton AJ, Sweeting MJ, et al.: Anti-TNF antibody therapy in rheumatoid arthritis and the risk of serious infections and malignancies: systematic review and meta-analysis of rare harmful effects in randomized controlled trials. JAMA 2006, 295: 2275–2285. 10.1001/jama.295.19.2275PubMedView Article
- Bissonnette R, Ho V, Langley RG: Safety of Conventional Systemic Agents and Biologic Agents in the treatment of Psoriasis. J Cutan Med Surg 2009,13(2):S67-S76.PubMedView Article
- Chien AL, Elder JT, Ellis CN: Ustekinumab: a new option in psoriasis therapy. Drugs 2009, 69: 1141–1152. 10.2165/00003495-200969090-00001PubMedView Article
- Weber J, Keam SJ: Ustekinumab. BioDrugs 2009, 23: 53–61. 10.2165/00063030-200923010-00006PubMedView Article
- Leonardi CL, Kimball AB, Papp KA, Yeilding N, Guzzo C, Wang Y, et al.: Efficacy and safety of ustekinumab, a human interleukin-12/23 monoclonal antibody, in patients with psoriasis: 76-week results from a randomised, double-blind, placebo-controlled trial (PHOENIX 1). Lancet 2008, 371: 1665–1674. 10.1016/S0140-6736(08)60725-4PubMedView Article
- Papp KA, Langley RG, Lebwohl M, Krueger GG, Szapary P, Yeilding N, et al.: Efficacy and safety of ustekinumab, a human interleukin-12/23 monoclonal antibody, in patients with psoriasis: 52-week results from a randomised, double-blind, placebo-controlled trial (PHOENIX 2). Lancet 2008, 371: 1675–1684. 10.1016/S0140-6736(08)60726-6PubMedView Article
- Reich K, Burden AD, Eaton JN, Hawkins NS: Efficacy of biologics in the treatment of moderate to severe psoriasis. Br J Dermatol 2012, 166: 179–188. 10.1111/j.1365-2133.2011.10583.xPubMedView Article
- Griffiths C, Strober BE, Van de Kerkhof P, Ho V, Fidelus-Gort H, Yeilding N, et al.: Comparison of ustekinumab and etanercept for moderate-to-severe psoriasis. N Engl J Med 2010, 362: 118–128. 10.1056/NEJMoa0810652PubMedView Article
- Chu E, Cartwright TH: Pharmacoeconomic benefits of capecitabine-based chemotherapy in metastatic colorectal cancer. J Clin Oncol 2008, 26: 2224–2226. 10.1200/JCO.2008.16.2826PubMedView Article
- Tilson L, Thornton L, O’Flanagan D, Johnson H, Barry M: Cost effectiveness of hepatitis B vaccination strategies in Ireland: an economic evaluation. Eur J Public Health 2008, 18: 275–282. 10.1093/eurpub/ckm123PubMedView Article
- ISPOR Drug Cost Task Force: Good Research Practices for Measuring Drug Costs in Cost Effectiveness Analyses. , South Lawrenceville; 2010.
- Feldman SR, Fleischer AB, Reboussin DM, Rapp SR, Bradham DD, Exum ML, et al.: The economic impact of psoriasis increases with psoriasis severity. J Am Acad Dermatol 1997, 37: 564–569. 10.1016/S0190-9622(97)70172-5PubMedView Article
- Lebwohl M, Papp K, Han C, Schenkel B, Yeilding N, Wang Y, et al.: Ustekinumab improves health-related quality of life in patients with moderate-to-severe psoriasis: results from the PHOENIX 1 trial. Br J Dermatol 2010, 162: 137–146. 10.1111/j.1365-2133.2009.09491.xPubMedView Article
- Langley RG, Feldman SR, Han C, Schenkel B, Szapary P, Hsu M-C, et al.: Ustekinumab significantly improves symptoms of anxiety, depression, and skin-related quality of life in patients with moderate-to-severe psoriasis: results from a randomized, double-blind, placebo-controlled Phase III trial. J Am Acad Dermatol 2010, 63: 457–465. 10.1016/j.jaad.2009.09.014PubMedView Article
- Reich K, Schenkel B, Zhao N, Szapary P, Augustin M, Borcier M, et al.: Ustekinumab decreases work limitations, improves work productivity, and reduces work days missed in patients with moderate-to-severe psoriasis: results from PHOENIX 2. J Derm Treat 2011, 22: 337–347. 10.3109/09546634.2010.499931View Article
- Finlay AY, Coles EC: The effect of severe psoriasis on the quality of life of 369 patients. Br J Dermatol 1995, 132: 236–244.PubMedView Article
- Schoffski O, Augustin M, Prinz J, Rauner K, Schubert E, Sohn S, et al.: Costs and quality of life in patients with moderate to severe plaque-type psoriasis in Germany: a multi-center study. J Dtsch Dermatol Ges 2007, 5: 209–218. 10.1111/j.1610-0387.2007.06240.xPubMedView Article
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-5945/12/10/prepub
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