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Epidemiology and treatment of psoriasis: a Brazilian perspective

Authors Duarte G, Porto-Silva L, de Oliveira M

Received 16 December 2014

Accepted for publication 2 February 2015

Published 17 April 2015 Volume 2015:5 Pages 55—64

DOI https://doi.org/10.2147/PTT.S51725

Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Prof. Dr. Uwe Wollina


Gleison V Duarte,1 Larissa Porto-Silva,2 Maria de Fátima Paim de Oliveira1

1Dermatology Department, Federal University of Bahia, Salvador, 2Escola Bahiana de Medicina e Saúde Pública, Salvador, BA, Brazil

Abstract: Psoriasis is a chronic immune-mediated systemic disease that is influenced by genetic and environmental factors, is associated with comorbidities, and has a negative impact on the quality of life of affected individuals. The prevalence of psoriasis varies among different ethnic groups, but this topic has not been studied in Brazil to date. In this review, we evaluate the epidemiology and treatment of psoriasis from a Brazilian perspective. We focused on studies that involved Brazilian subjects. The prevalence of psoriasis in Brazil is estimated to be 2.5%, but no population study has been performed previously. Environmental factors, such as tropical climate, in association with genetic factors, such as miscegenation, may exert a beneficial impact on the course and frequency of psoriasis in Brazil. A number of studies have advanced our understanding of the cardiovascular, ophthalmic, and oral comorbidities that are associated with psoriasis. Concerns about biological therapy, such as endemic leprosy, human T-cell lymphotropic virus (HTLV), and tuberculosis infections, are discussed. The nonavailability of treatment options for psoriasis in the public health system contradicts the Brazilian Society of Dermatology guidelines, stimulating the judicialization of access to medicines in psoriasis care.

Keywords: psoriasis, epidemiology, comorbidities, health services accessibility, health care disparities, insurance, health care costs

Introduction

Psoriasis is a chronic immune-mediated systemic disease that is influenced by genetic and environmental factors, is associated with comorbidities, and has a negative impact on the quality of life of affected individuals.1,2 This disease is characterized by well-delimited erythematous scaly plaques with variable patterns and body distributions. The most common phenotype is psoriasis vulgaris.

The worldwide prevalence of psoriasis varies from 0.6% to 4.8%.1,3,4 The prevalence among different races varies from zero among Samoans and North American Indians to 11.8% among Kazakhstanis. In the USA, psoriasis is found in 0.45%–0.7% of African-Americans but affects 1.4%–4.6% of North Americans.5 Schaefer et al6 reported a psoriasis prevalence of 2.1% among 48,665 individuals in Germany. The objective of this review is to summarize Brazilian data concerning the epidemiology, comorbidities, and treatment of psoriasis.

Epidemiology and comorbidities of psoriasis in Brazilian patients

In Brazil, no previous population study has evaluated the incidence and prevalence of psoriasis. No national database or registry studies are available as in other developed countries; however, studies are available concerning some clinical aspects, comorbidities, and treatment regimens of psoriasis. In addition, the conclusions of national and regional surveys cannot be applied to the entire Brazilian population. Figure 1 shows Brazilian Federal Units and their respective skin color distributions and populations. In Table 1, we list the available Brazilian studies related to the epidemiology of psoriasis.

Figure 1 Brazilian Federal Units and their respective skin color distributions and populations.
Notes: (A) Estimated prevalence of psoriasis in an Amazonian state (Northern Brazil);37 (B) Psoriasis is the most frequent cause of erythroderma (44.9%) in São Paulo.48 White skin color predominates in the southern states, while black and brown skin colors predominate in northeastern and northern Brazil. According to the Brazilian Society of Dermatology, the northern and southern regions were the regions with least and most expressive psoriasis-motivated consultations, respectively. Figure adapted from ibge.gov.br [homepage on the internet]. Atlas do Censo Demográfico 2010; 2010. Available from: http://censo2010.ibge.gov.br/apps/atlas/.47

Table 1 Brazilian studies concerning the epidemiology of psoriasis
Abbreviations: SBD, Sociedade Brasileira de Dermatologia; OR, odds ratio.

The available studies that focused on comorbidities are listed in Table 2. Silva et al7 evaluated the profile of psoriasis patients using biological drugs. The main indications for biological therapy were a poor response to other systemic treatments (55.4%) and a psoriatic arthritis diagnosis (81.1%). Comorbidities, primarily dyslipidemia (25.7%), were diagnosed in 62.2% of the sample.7

Table 2 Brazilian studies concerning psoriasis comorbidities
Abbreviations: HBP, high blood pressure; DLP, dyslipidemia; DM, diabetes mellitus; WhtR, waist-to-height ratio; WC, waist circumference; WHR, waist-to-hip ratio; BSA, body surface area; BMI, body mass index; HCV, hepatitis C virus; OR, odds ratio; 95% CI, 95% confidence interval.

Two studies that were conducted in Brazil assessed the prevalence of oral lesions in patients with psoriasis and observed that the evaluated patients exhibited no disease-specific oral lesions. The oral lesions that were found in patients with psoriasis were also found in the control group; however, a greater prevalence of fissured tongue and geographic tongue was observed in patients with psoriasis than in the general population.8,9

Paim et al10 evaluated 50 patients with psoriasis and identified ophthalmic changes in 86% of those patients. Meibomian gland dysfunction was the most frequent ophthalmic change. Lima et al11 reported the type and frequency of ophthalmological manifestations in patients with psoriatic arthritis in Brazil. Xerophthalmia was the most common ocular finding in those patients. The authors recommended early ophthalmologic evaluation in patients with psoriatic arthritis and ophthalmologic symptoms.11

Treatment of psoriasis: Brazilian consensus and protocols

The most recently published Brazilian guideline (2012) for moderate-to-severe psoriasis (ie, psoriasis area and severity index [PASI] ≥10 or body service area [BSA] ≥10 or dermatology life quality index [DLQI] ≥10) (Figure 2) suggests an algorithm for patients without psoriatic arthritis: an initial phototherapy treatment, followed by classic antipsoriatic drugs (ie, acitretin/methotrexate, depending on sex and childbearing potential).12

Figure 2 Algorithm of the Brazilian Society of Dermatology for moderate-to-severe psoriasis.
Notes: Copyright © 2012 Brazilian Society of Dermatology (SBD). Reproduced from Amaral Maia CP, Takahashi MD, Romiti R, Sociedade Brasileira De Dermatologia. Consenso Brasileiro de Psoríase 2012 – Guias de Avaliação e Tratamento. 2a ed. New York: Biblioteca; 2012. [ISBN 978-85-89240-04-8];12 with permission from the Brazilian Society of Dermatology (SBD).
Abbreviation: UVB/PUVA, narrow-band ultraviolet B/combination of psoralen and long-wave ultraviolet radiation.

Methotrexate should be considered when no PASI change is observed after 6 weeks of treatment or when only modest changes are observed after 10–16 weeks. Cyclosporin is suggested for a limited period of time (ie, a maximum of 2 years), for pregnant women and patients with erythrodermic psoriasis and secondary loss of response to classic or biological drugs. Biological drugs should be reserved for patients with no response or a contraindication or intolerance to at least one classic drug and phototherapy.12 Only adalimumab, infliximab, and etanercept have been approved for psoriasis and psoriatic arthritis by the health regulatory agency in Brazil (ANVISA – National Agency for Sanitary Vigilance). Ustekinumab is currently approved exclusively for psoriasis treatment.12

The biological treatment goals for moderate-to-severe psoriasis are the same as those adopted by the European consensus.13 Special issues related to Brazilian biological drug care are listed below:

  1. High HTLV prevalence in many states of Brazil.14 This high prevalence raises concerns about the capacity of biological immunosuppression to induce lymphomas and HTLV-associated myelopathy in asymptomatic patients.
  2. Endemic and highly prevalent tuberculosis in all regions of Brazil. Brazil has the 14th highest prevalence of tuberculosis among 22 countries and is responsible for 31% of all tuberculosis cases in Latin America. Despite compulsory Bacillus Calmette–Guérin (BCG) vaccination, there are 25–49 estimated cases of active tuberculosis per 100,000 in Brazil.15 The recent nonavailability of purified protein derivative (PPD for the Mantoux test) in nearly all regions, combined with the nonavailability of interferon-γ release assays or other assays for public health assistance, make biological treatments much more unsafe. There is a possibility of extending latent tuberculosis treatment for all biological candidate patients in this scenario.16
  3. Anti-tumor necrosis factor (TNF)-α drugs and ustekinumab were not included in the national clinical protocol (PCDT – the abbreviation for Clinical Protocol and Therapeutic Algorithm, in Portuguese) for psoriasis treatment. Consequently, these drugs are not reimbursed for the treatment of moderate-to-severe psoriasis. In addition, reimbursement for biological treatments for moderate-to-severe psoriasis is not mandatory for private health insurers in Brazil; only combination of psoralen (P) and long-wave ultraviolet radiation (UVA), ie, PUVA phototherapy, receives mandatory coverage for the treatment of this disease.17 This conflict in private health insurance coverage has stimulated lawsuits that aim to guarantee access to medications. From 1999 to 2009, in Minas Gerais, which is a state of southern Brazil, 2,412 lawsuits that included 2,880 medicine requests for 18 different drugs were analyzed. Among the most frequent treatments requested were adalimumab, etanercept, and infliximab. The ability to obtain medications by lawsuit may privilege people with better financial resources who are able to pay lawyers and disadvantage people with poor socioeconomic status.18 Regardless of socioeconomic status, lawsuits expose all patients to more stress. Machado et al19 confirm that only 23% of judicial representation was performed by public defenders between 2005 and 2006. Again, immunosuppressors, particularly adalimumab and etanercept, were the most requested subgroup of drugs. The authors draw attention to the aggravation of health access inequity.19
  4. Low availability of phototherapy in public and private health systems. The Brazilian psoriasis consensus sent an alert to health authorities recommending the creation of new phototherapy centers because it is a highly efficacious and low-cost therapy that facilitates long-term psoriasis control. In addition, the alert emphasized that systemic treatments, which have more adverse reactions and higher comparative costs, could be avoided or recommended to a smaller number of patients.12
  5. The coexistence of leprosy and psoriasis in the same patient is rarely described in the literature. Only 20 cases of psoriasis were diagnosed among 1,450,661 individuals with leprosy.20,21 Nevertheless, cases of secondary leprosy were described after psoriasis treatment with infliximab and etanercept. It is possible that anti-TNF-α may interfere with the granulomatous immune response, leading to the reactivation of latent granulomatous infections and the development of opportunistic infections, such as leprosy and tuberculosis. Therefore, in our opinion, systematized investigation is recommended before starting treatment and more rigorous monitoring is recommended during anti-TNF-α treatment.20,2224

A Brazilian study evaluated the frequency of PUVA and narrow-band UVB (NB-UVB) prescriptions for patients with psoriasis who have not responded to topical treatment. The prescription of NB-UVB was more frequent than that for PUVA, probably due to the smaller number of contraindications and side effects, despite the high prevalence of individuals with elevated Fitzpatrick phototypes.25,26

Studies of new therapies have been scarce in Brazil. Netto et al27 evaluated intradermal delipidated, deglycolipidated Mycobacterium vaccae (PVAC antigen) treatment in 165 psoriasis patients who were divided into three groups (ie, 50 μg, 15 μg, and placebo). The PASI 75 responses (13%, 9%, and 18%) were similar among the study groups in the 12th week (P=0.429). The incidence of adverse effects was greater in the group treated with PVAC than in the placebo group (98.2% vs 70.9%, P<0.001). These effects included primarily local non-severe reactions. Despite the safety of this method, it was not clearly superior to placebo.27

Psoriasis treatment in Brazil: public and private perspectives

Approximately 25% of the Brazilian population (50,930 million) has contracted supplementary private health insurance, and 75% relies on treatments available from the Brazilian public health care system (Sistema Único de Saúde or SUS).28 SUS is a tax-based health care system that is based on universal access to care.

Since 2002, the Brazilian government health system has made acitretin and cyclosporin available for psoriasis treatment.29 In 2010, classic and biological anti-TNF-α drugs were added to the public psoriatic arthritis treatment public protocol.30,31 However, anti-TNF-α drugs and ustekinumab are not reimbursed for the treatment of moderate-to-severe psoriasis, as these drugs have not been included in the national clinical protocol (PCDT).32

According to data from the national program of exceptional distribution (high-cost drugs), from 2000 to 2004, the percentage of patients using acitretin was very low (1.34% of women, 3.38% of men, and 2.08% of both sexes) compared to other high-cost drugs prescribed for other conditions. The same result was observed for cyclosporin (2.0% of women, 4.79% of men, and 3% of both sexes), when considering the use of this drug for psoriasis and other conditions. Methotrexate was not included in this program due to its relatively low cost. Injectable methotrexate was added to the list of available drugs for psoriasis treatment only in 2013.31,33 Despite being adopted as a psoriasis treatment option in PCDT, no study evaluating methotrexate efficacy was included due to the insufficient grade of the evidence available for this drug.32 The adoption of biologicals was considered premature by the government health system due to “high costs, adverse reactions, comparison to placebo in the majority of studies and short follow up.” Curiously, the same protocol establishes severe psoriasis only when BSA ≥ 20% or PASI ≥ 12, as suggested by Schmitt and Wozel,34 but in contrast to most guidelines.

We have raised questions about this protocol in Table 3. In spite of these questions, it remains necessary to compare costs and clinical results to support decisions in health and public policy development. A Brazilian study assessed the direct and indirect costs of psoriasis treatment. Comparing men and women, the total annual cost per patient was greater for males, who were prone to more severe psoriasis. The total cost was also related to the duration of the disease. Biological treatments had a median cost that was 22 times greater than that of systemic conventional treatments; biological treatments also had an indirect annual cost that was 55% higher than that of systemic conventional treatments.35

Table 3 Listed reasons for the exclusion of biological treatments for psoriasis management (government protocol)
Abbreviations: DMARD, disease-modifying antirheumatic drug; PASI, psoriasis area and severity index; TNF, tumor necrosis factor.

Regarding access to biological treatments in Brazil, supplementary health insurance may or may not reimburse these drugs, as private payers can opt to expand coverage to those interventions, limiting access based on individual decisions or based on each health insurance company’s policy.36

Discussion

The psoriasis frequencies described by the studies in Table 1 are similar to data from the literature, which estimate that 1%–2% of the populations in Germany, Britain, and the USA are affected.6,37 Previous data from a census provided by the Brazilian Society of Dermatology in 2005 estimated a 2.5% frequency based on a multicentric population from 17 states, including private and public dermatology services.38 Higher frequencies were found among alcoholic individuals in comparison to nonalcoholic controls.39 Moreover, psoriasis patients also had a high prevalence (46.8%) of alcohol consumption.40

In Brazil, it is possible that miscegenation and the tropical climate exert a beneficial impact on the psoriasis course and frequency, but it remains unclear whether mixed-race and black Brazilian individuals are less affected by psoriasis.25 As in other countries, Brazilian psoriasis patients are prone to several cardiovascular and ophthalmic comorbidities11,40,41 and emerging studies have described a considerable number of nonspecific oral manifestations.9 The frequency of hepatitis C infection is similar to the frequency described in Japan.42

Brazilian guideline recommendations have encountered availability problems in public and private health systems. Although phototherapy has been the first therapeutic choice for moderate-to-severe psoriasis, this treatment is rarely available in the public sector.12,26 Health insurance companies are only obligated to reimburse PUVA, which is not the first phototherapy choice of Brazilian dermatologists.17 In contrast to these guidelines, biologicals are not included in the government psoriasis treatment protocol. The problem of inadequate treatment options and insufficient access to care is addressed in the Sixty-seventh World Health Assembly, which recognizes psoriasis as a “chronic, noncommunicable, painful, disfiguring, and disabling disease for which there is no cure.”43 While the scientific community recognizes the importance of biological agents for the treatment of moderate-to-severe psoriasis, the financial resources necessary to fund such a high-cost treatment modality are finite and often misused,44 as noted by the low investment in the provision of phototherapy in the public health system. Difficulties regarding access have stimulated the judicialization of access to medicines in psoriasis care.19

Safety concerns related to biological treatment are an important issue, as the country has high endemic rates of leprosy, tuberculosis, and HTLV infections.14,15,22 The government protocol justifies the exclusion of biologicals for psoriasis treatment (except psoriatic arthritis) based on high costs, adverse reactions, comparison to placebo in the majority of studies, and short follow-up duration in studies.32

The fact that the Brazilian Ministry of Health protocol for psoriasis treatment does not cover biological agents makes it difficult to access these drugs. Once the need for biological therapy is verified, the individual clinical choice of which drug will be required is determined via lawsuit rather than by official documents guided by the most cost-effective medicine.44

In conclusion, our understanding of psoriasis as a multisystem disease has grown in the past decade after the publication of several psoriasis comorbidity studies in Brazil. Population studies evaluating the prevalence and distribution of this disease among races have not yet been performed. Despite the absence of psoriasis among natives of the Andean region of South America,45 Brazil has a highly miscegenated population; as a result, a dissociation between skin color and genomic ancestry46 makes it unlikely that identical results will be obtained in Amerindian Brazilians. Because Brazilian government protocol contradicts the national consensus regarding the treatment of psoriasis, studies of cost-effectiveness and additional investments in phototherapy and systemic drug availability are urgent. Otherwise, insufficient access will be aggravated by the growing number of lawsuits.

Acknowledgment

We are grateful to Otávio Nassif for reviewing the manuscript.

Disclosure

Dr Duarte and Dr Oliveira have participated as speakers for AbbVie, Janssen, and Pfizer in the past 5 years. Dr Porto-Silva reports no conflicts of interest in this work.


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