Abstract
Psoriasis is an immune-mediated inflammatory disease associated with an increased risk of cardiovascular disease (CVD). The risk of CVD increases with the severity of psoriasis, and exposure to systemic inflammation may partly explain the increased risk of CVD in these patients. This raises the question of whether anti-psoriatic treatment, in addition to treating the skin lesions, also lowers the risk of developing CVD. Different types of studies have examined the impact of systemic anti-psoriatic treatments on the risk of CVD in patients with psoriasis and epidemiological observational studies with, e.g., myocardial infarction and stroke as outcomes, and clinical studies investigating circulating inflammatory biomarkers in the blood indicate that anti-psoriatic therapy has a protective effect; however, no randomized controlled trial (RCT) has examined the impact of systemic anti-psoriatic treatment on future hard cardiovascular endpoints. This narrative review provides an overview of the clinical cardiovascular imaging studies examining the effect of systemic anti-psoriatic treatment on the risk of subclinical CVD in patients with psoriasis. We found a total of 24 clinical imaging studies, where 16 of these were observational cohort studies and eight were RCTs. The observational studies suggest an improvement in the risk of subclinical CVD based on different cardiovascular imaging biomarkers; however, the RCTs showed inconsistent results and mainly included vascular inflammation as the outcome. Future RCTs including other imaging biomarkers as surrogates for subclinical CVD, with longer follow-up and with hard cardiovascular endpoints are warranted to address whether systemic anti-psoriatic treatments reduce the risk of CVD.
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The systemic inflammation seen in patients with psoriasis may partly explain the increased risk of cardiovascular disease in these patients. |
Epidemiological studies suggest that systemic anti-psoriatic treatment may reduce the risk of cardiovascular disease in patients with psoriasis. |
The observational cardiovascular imaging studies included in this review indicate that systemic anti-psoriatic treatment, mainly with biologics, has a protective effect on subclinical cardiovascular disease (CVD); however, these studies vary greatly in design, sample size and included different cardiovascular imaging biomarkers as outcomes. |
The results from randomized controlled trials (RCTs) are inconsistent and mainly include biologics as intervention and vascular inflammation detected by fluorodeoxyglucose positron emission tomography/computed tomography as the outcome. |
RCTs with longer follow-up time including different cardiovascular imaging outcomes and hard cardiovascular endpoints are warranted to elucidate whether different anti-psoriatic treatments reduce the risk of CVD in patients with psoriasis. |
Introduction
Psoriasis is an immune-mediated inflammatory disease characterized by scaly and erythematous well-demarcated skin lesions [1]. A dysregulated immune system, involving both the innate and adaptive system, is the cornerstone of the pathogenesis [2]. Interestingly, increased levels of immune cells and pro-inflammatory cytokines are not found only in the skin but also in the blood [3,4,5,6]. This chronic systemic inflammation is suggested to be part of the explanation for the increased risk of several comorbidities in patients with psoriasis, such as psoriatic arthritis, metabolic syndrome, diabetes, mental disorders, inflammatory bowel disease, liver disease and, in particular, cardiovascular disease (CVD) [7]. The chronic systemic inflammation in patients with psoriasis is thought to enhance endothelial dysfunction, leading to atherosclerosis and cardiovascular events [8] (Fig. 1). Moreover, patients with psoriasis have a high prevalence of unfavourable lifestyle factors such as obesity [9], low physical activity [10], smoking [11], hypertension [9] and dyslipidaemia [9], which also contributes to the development of CVD. Interestingly, a recent Mendelian randomization study also found causality in the other direction, where coronary artery disease appears as a causal risk factor for developing psoriasis [12].
During the last 20 years, biologics have been introduced as highly effective treatment options for patients with moderate to severe psoriasis [1]. Biologics target specific cytokines or receptors along the inflammatory pathways of the disease. In the wake of that, biologics and other systemic anti-psoriatic treatments have been suggested to reduce skin symptoms and the systemic inflammatory burden and consequently reduce the risk of atherosclerosis. In 2017, a landmark study from the Canakinumab Antiinflammatory Thrombosis Outcome Study (CANTOS) Trial Group found that anti-inflammatory therapy with canakinumab reduced the risk of recurrent cardiovascular events compared with placebo in patients with previous myocardial infarction [13]. The emerging question for dermatologists is whether we can reduce the risk of CVD in our patients if we treat the psoriatic skin lesions early and more aggressively [14]. Since CVD develops slowly over several years, gold-standard randomized controlled trials (RCTs) examining the impact of systemic anti-psoriatic treatment on cardiovascular disease in patients with psoriasis is difficult to conduct. With the desire to answer this question, four types of generic studies have been conducted. First, RCTs examining the efficacy of a new drug, and herein also reporting safety data. These studies focus on acute adverse events, such as major cardiovascular events (MACE) caused by the drug during a short trial period (12–52 weeks). Second, observational register-based studies examining the long-term risk of developing CVD according to different anti-psoriatic treatments. The advantage of register-based studies is the long follow-up time; however, these studies are subject to different kinds of bias and confounding. Although these studies are good for generating hypotheses, they are not suitable for determining causal relationships. Third, clinical studies examining the effect of anti-psoriatic treatment on subclinical atherosclerosis using pro-inflammatory cytokines and other mediators of inflammation as surrogate biomarkers for future CVD. The clinical validity of these biomarkers is still uncertain and may not be a good measure of future CVD. Fourth, clinical studies examining the effect of anti-psoriatic treatment on subclinical atherosclerosis using imaging methods (imaging biomarkers) as a surrogate for future risk of CVD. Imaging biomarkers detect existing (but subclinical) disease and may therefore be closer to the clinical outcome (CVD) compared with biomarkers measured in the blood [15] and might be a better surrogate for future CVD.
Therefore, this narrative review aims to summarize what we know from clinical studies examining the effect of anti-psoriatic treatment on subclinical atherosclerosis using imaging biomarkers as a surrogate for future CVD.
Methods
Our search included clinical studies published in English examining the potential role of systemic anti-psoriatic treatment on the risk of subclinical atherosclerosis. These articles were extracted by three independent reviewers (Hannah Kaiser, Charlotte Näslund-Koch and Amanda Kvist-Hansen) from the PubMed database. The search was performed until 1 July 2023, and the following combination of search terms were used: ‘psoriasis’ or ‘psoriatic’ and ‘cardiovascular imaging’, ‘computed tomography’, ‘positron emission tomography’, ‘cardiovascular events’, ‘myocardial infarction’, ‘stroke’ and ‘biologics’, ‘IL-17 inhibitor’, ‘TNF-alpha inhibitor’, ‘TNF inhibitor’, ‘IL-12/23 inhibitor’, ‘IL-23 inhibitor’, ‘JAK-inhibitor’, ‘Infliximab’, ‘bimekizumab’, ‘etanercept’, ‘adalimumab’, ‘ustekinumab’, ‘secukinumab’, ‘ixekizumab’, ‘brodalumab’, ‘guselkumab’, ‘tildrakizumab’, ‘risankizumab’, ‘ciclosporin’, ‘methotrexate’, ‘acitretin’, ‘apremilast’ or ‘fumaric acid’. In addition, systematic reviews and meta-analyses on the subject were screened for relevant articles. We only included studies or the part of studies examining the effect of systemic anti-psoriatic treatment on imaging biomarkers in patients with psoriasis compared with a control/placebo group or studies comparing baseline and post-treatment values. This article is based on previously conducted studies and does not contain any new studies with human participants or animals performed by any of the authors.
Imaging Modalities
Cardiovascular imaging measurements are widely used as biomarkers of subclinical atherosclerosis and include simple bedside ultrasound imaging and more advanced methods such as the computed tomography (CT; Fig. 2). Carotid intima-media thickness (CIMT) of the carotid, brachial and/or femoral arteries is examined by traditional 2D ultrasound, and increased CIMT is associated with increased risk of CVD including, e.g., coronary artery disease and stroke [16, 17]. In addition, echocardiography is a bedside examination of the myocardial function, and, e.g., left ventricular dysfunction measured by the global longitudinal strain (GLS) value may predict adverse cardiovascular events [18, 19]. Furthermore, other non-invasive measurements include pulse wave velocity (PWV) and flow-mediated dilatation (FMD) as measurements of arterial stiffness and endothelial dysfunction, respectively, and these values have been shown to be related to cardiovascular events and all-cause mortality [20, 21].
Other more time-consuming cardiovascular imaging methods include magnetic resonance imaging (MRI), coronary computed tomography angiography (CCTA) and fluorodeoxyglucose positron emission tomography/computed tomography (FDG-PET/CT). Both MRI and CCTA can examine the total plaque burden within the arteries (mainly the aorta or coronary or carotid arteries), and coronary artery disease detected by CCTA is strongly linked with increased risk of future adverse cardiac events [22]. The coronary artery calcium score (CACS) is detected from a non-invasive low-radiation non-contrast CT. This marker describes the amount of calcification in coronary artery plaques and is also associated with increased risk of future CVD [23, 24]. In the recent two decades, vascular inflammation, primarily in the carotid arteries or the aorta detected by the FDG-PET/CT has become a frequent measurement of subclinical atherosclerosis. In brief, the mechanism is based on uptake of the intravenously injected FDG by living cells such as the macrophages, and within these cells FDG gets trapped. During inflammation within the vessel wall, especially macrophages proliferate. FDG accumulates in proportion to the cellular metabolic activity in these cells and therefore allows for FDG-PET/CT to visualize inflammation in vascular tissue, and vascular inflammation has shown to be predictive of future CVD [25, 26].
Results of Clinical Imaging Studies
We identified a total of 710 articles and excluded studies that did not examine a cardiovascular imaging endpoint, had no follow-up after the systemic anti-psoriatic treatment or lacked a control/placebo group. We included a total of 24 studies; out of these, 16 studies were observational cohort studies [18, 27,28,29,30,31,32,33,34,35,36,37,38,39,40,41] and 8 were RCTs [42,43,44,45,46,47,48,49] (Table 1 and Table 2).
Observational Cohort Studies
A total of 1406 patients with psoriasis and/or psoriatic arthritis were included in the 16 observational studies, with follow-up times ranging from 3 months [31] to approximately 3 years [28, 29], but 6–12 months were most common. The designs of the studies differed; five of them included a control group of patients with psoriasis not receiving systemic anti-psoriatic treatment or biologics [30, 33,34,35,36], whereas the remaining 11 studies measured changes from baseline (Table 1). Overall, the studies had small sample sizes: eight of the studies had a sample size of ≥ 50 patients [29, 30, 33,34,35,36,37, 40], and the largest study included 209 patients [36]. Only one study investigated the effect of a non-biologic drug, apremilast [40], whereas the rest of the studies examined the effect of biologics. Seven studies examined the effect of biologics as a group [18, 29, 31, 33,34,35,36], and five of these studies subsequently stratified according to specific target (TNF, IL-17 or IL-12/23) [29, 33,34,35,36]. In addition, four other studies focused only on the effect of anti-TNF [27, 28, 30, 41]. Two studies restricted their analyses to the effect of anti-IL-17 agents [37, 39], and one study to the effect of anti-IL-12/23 agents [32].
The observational cohort studies used different imaging modalities as surrogates for subclinical atherosclerosis including vascular inflammation, myocardial dysfunction, endothelial dysfunction, coronary-, carotid-, brachial- and femoral atherosclerosis, coronary artery plaque burden and arterial stiffness (Fig. 2). All, except two [38, 40] of the observational cohort studies showed a significant improvement or reduction in disease progression of the specific cardiovascular imaging biomarker during follow-up examinations (Table 1). Studies examining aortic vascular inflammation found that 1 year of anti-TNF treatment was associated with both improvement in vascular inflammation independent of CVD risk factors [30] and reduced psoriasis severity and improvement in vascular inflammation [29]. Treatment for 5 months with ustekinumab was associated with reduced vascular inflammation in almost all segments of aorta in 10 patients with psoriasis [32], while no significant effect on vascular inflammation was found after 16 or 52 weeks of treatment with apremilast [40]. In addition, coronary inflammation assessed by perivascular fat attenuation index (FAI) was reduced after 1 year of treatment with biologics, which remained consistent after stratification of biologic agents (anti-TNF, anti-IL-12/23 and anti-IL-17) [35]. Studies examining coronary atherosclerosis and coronary artery plaque burden found reduced coronary artery progression [34] (significant difference in those who received biologics versus control group), improvement in coronary plaque morphology and reduced total and high-risk coronary plaques [31, 33, 36] after treatment with biologics as a group including anti-TNF, anti-IL12/23- and anti-IL-17 agents. Moreover, carotid-, brachial- and femoral atherosclerosis, arterial stiffness, and myocardial and endothelial function improved during treatment with anti-TNF, anti-IL-12/23 or anti-IL-17 agents (Table 1). However, one study did not find any significant effect of either anti-IL-12/23 or anti-IL-17 agents on arterial stiffness or carotid atherosclerosis [38]. Another study only found reduced carotid and brachial intima-media thickness (IMT) in those without pre-existing atherosclerotic plaques after 6 months of treatment with anti-TNF [27].
Overall, the observational studies varied greatly in terms of design, sample size and outcome (measured imaging biomarker), but the studies generally reported reductions or improvements in imaging biomarkers associated with CVD after treatment with biologics.
Randomized Controlled Trials
In total, all the eight RCTs included 685 patients with psoriasis (both patients receiving intervention and placebo). In five out of the eight included RCTs, patients were randomized to intervention or placebo for the first 12 or 16 weeks, and following this, the placebo group crossed over and received the intervention for approximately 1 year [43, 46,47,48,49]. Two studies had included control groups that either received etanercept and cyclosporine [44] or phototherapy and/or local therapy [42]. Only one study examined the effect of a non-biologic treatment (methotrexate), and this study had a control group that received placebo, with or without plioglitazone [45].
Vascular inflammation was the main outcome in six of eight studies [42, 43, 45, 46, 48, 49]. Two of these studies found a significant reduction in vascular inflammation after treatment with adalimumab and ustekinumab for 15 weeks and 12 weeks, respectively [42, 48]. However, the effect of ustekinumab did not remain significant at follow-up after 52 weeks [48]. Moreover, four studies showed no effect on vascular inflammation after treatment with adalimumab (12, 16 or 52 weeks), methotrexate (12 weeks) and secukinumab (12 or 52 weeks) [43, 45, 46, 49].
Treatment with ustekinumab was associated with improvements in myocardial function and arterial stiffness in one study after 4 months [37], and treatment with secukinumab reduced the endothelial dysfunction measured by flow-mediated dilation (FMD) after 1 year, but no difference was found in arterial stiffness or total plaque burden in the carotid arteries or aorta [47].
Overall, the findings from the RCTs do not indicate an effect of anti-psoriatic treatment on the risk of CVD. Most of the studies investigated changes in vascular inflammation over a short period of time (12–16 weeks) compared with placebo, and since all patients crossed over to the intervention group, the results at week 52 were not placebo controlled.
Discussion
In this narrative review, we summarize the results of clinical studies using cardiovascular imaging biomarkers of subclinical CVD to investigate effects of systemic anti-psoriatic treatment on the risk of CVD in patients with psoriasis. We included both observational clinical studies and RCTs, and the majority of the observational studies reported a protective effect of systemic anti-psoriatic treatments on subclinical CVD. In contrast, results from RCTs were inconsistent and do not confirm that systemic anti-psoriatic treatments reduce the risk of subclinical CVD.
Other types of studies have also been conducted to investigate the effect of systemic anti-psoriatic treatment on the risk of CVD. A large meta-analysis based on safety data from RCTs reported that treatment with biologics were not associated with increased risk of MACE during the short clinical trial periods, typically 12–52 weeks [50]. Safety data was also examined in a prospective cohort study investigating the risk of MACE up to 2 years after initiation of different biologics and methotrexate and did likewise not find any difference in MACE between the treatment groups [51]. These studies were not designed to examine whether systemic anti-psoriatic treatment reduces the incidence of CVD in patients with psoriasis but rather merely to investigate potential adverse events due to biologics. Registry data have suggested a protective effect of treatment with anti-TNF agents [52] and methotrexate [53] on the incidence of CVD such as myocardial infarction and stroke in patients with psoriasis. The advantages of register-based studies are long follow-up time, large sample sizes and the ability to investigate actual CV events rather than surrogates. Studies using circulating inflammatory biomarkers in blood as surrogates for subclinical CVD in patients with psoriasis have also been conducted, these biomarkers include, e.g., GlycA [54], S100A8/9 [55], growth differentiation factor-15 (GDF-15) [56], high-sensitivity (hs)-CRP [57] and the neutrophil-to-lymphocyte ratio (NLR) [5]. Some of these biomarkers are also known predictors of CVD in the general population [58,59,60]. Interestingly, in patients with psoriasis, decreased levels of both NLR and hs-CRP have been reported under treatment with biologics [61]. Several studies included in this review also examined blood biomarkers of systemic inflammation including, e.g., hs-CRP [27, 29, 31, 33,34,35,36, 40, 42, 43, 46,47,48,49], IL-6 [40, 43, 44, 46, 48, 49], TNF-α [40, 43, 44, 46, 48, 49] and GlycA [36, 40, 46, 48, 49], among others. The most frequently measured inflammatory biomarker was hs-CRP, and levels of hs-CRP were reduced after different systemic anti-psoriatic treatments in six out of eight and in three out of six observational studies and RCTs that included hs-CRP in their analyses, respectively. However, whether the reported decrease in circulating inflammatory biomarkers observed under systemic anti-psoriatic treatment results in a reduced risk of CVD in these patients is still unknown and needs further investigation. In summary, studies on safety data, register data, and circulating inflammatory biomarkers support the findings from the observational studies included in this review.
In contrast to results from the observational studies, the included imaging RCTs showed inconsistent results. Treatment with ustekinumab reduced vascular inflammation after 12 weeks, but this effect was not sustained after 52 weeks [48]. Additionally, adalimumab and secukinumab did not show an effect on vascular inflammation [46, 49], and contradictory adalimumab showed a small increase in vascular inflammation after 52 weeks [43]. There may be various reasons for the conflicting results between the observational imaging studies and the RCTs. In the RCTs, the most frequent investigated imaging biomarker was vascular inflammation obtained by the FDG-PET/CT. Although this imaging biomarker has been associated with future CVD [26], some limitations must be considered. The spatial resolution of FDG-PET is low, which reduces the ability to detect small early-stage plaques of atherosclerosis. Furthermore, the FDG uptake is relatively small in inflammatory plaques, leading to a reduced contrast between the plaques and the surrounding background. To compensate for this, vascular inflammation values are often corrected by the target-to-background ratio (TBR) [62]. However, TBR values depend on the time between FDG injection and imaging acquisition, which have varied between study protocols [62]. Moreover, different cardiovascular imaging biomarkers may describe different stages of the atherosclerotic disease progression with not necessarily a strict overlap, which may cause discrepancy between the results found in the observational studies and the RCT [63, 64]. Indeed, vascular inflammation and, e.g., calcifications in the arterial wall most likely represent different phases of atherosclerosis [65].
Important limitations in the included imaging RCTs are small sample sizes and short follow-up periods. A follow-up period of 12–52 weeks may be too short of a period to examine the real effects of biologics on the actual risk of CVD. The observational studies investigated different imaging biomarkers of subclinical CVD obtained by a variety of methods, and no studies examined the cardiovascular effort tolerance. The studies are therefore not directly comparable. However, the studies generally reported reductions and improvements in subclinical CVD after treatment with biologics, pointing towards a protective effect of biologics on the CVD risk in patients with psoriasis. Furthermore, several of the observational studies had a relatively long follow-up time of approximately 1 year, and two studies excelled by including up to 3 years of follow-up time [28, 30]. Another important aspect of the CVD risk in patients with psoriasis is the higher prevalence of traditional CV risk factors including hyperlipidemia, and in these patients cholesterol-lowering drugs including statins have been reported beneficial by reducing cholesterol levels and CV events [66]. Also statin treatment has been linked with reduced aortic vascular inflammation measured by the FDG-PET/CT in patients with psoriasis [67]. Indeed, statin use is an important confounder which also displays pleiotropic anti-inflammatory actions [68], and importantly, it is a strength that 12 out of the 16 observational studies adjusted for statins, equally distributed statin-users between the groups or excluded patients with dyslipidemia [18, 27, 29,30,31,32,33,34,35,36,37, 39]. In the RCTs, patients who received statins appeared with equal frequency between the groups [44, 46, 48, 49] were excluded from the study [45] or the use of statins was continued during the study if a constant stable dose was received by the patients [42, 43, 47]. In addition, several of the studies included different anti-psoriatic treatment, and each treatment may have different effect on the risk of subclinical CVD.
There are some ongoing RCTs investigating the impact of systemic anti-psoriatic treatment on risk of CVD using different imaging and circulating inflammatory biomarkers. As a result, more data is soon available to further examine this inconclusive field. However, RCTs with clinical hard CV endpoints are still lacking.
Conclusion
In conclusion, the results of this narrative review suggest that systemic anti-psoriatic treatment (biologics) reduces the risk of subclinical atherosclerosis measured by cardiovascular imaging biomarkers in observational studies. When using vascular inflammation as outcome in RCTs, this could not be confirmed, which could be due to short follow-up times. Importantly, whether and how changes in cardiovascular imaging biomarkers correlate with the actual risk of CVD is still unknown. Also, the individual drug may have various impacts on the risk of CVD, and this should be taken into account in future studies. CVD develops slowly, usually over years or decades, and therefore a longer follow-time along with hard CV endpoints such as myocardial infarction and stroke should ideally be included in future RCTs to be able to answer whether systemic anti-psoriatic treatment impacts the risk of CVD.
Data Availability
Data sharing is not applicable to this article, as no datasets were generated or analysed during the current study.
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All named authors meet the International Committee of Medical Journal Editors (ICMJE) criteria for authorship for this article, take responsibility for the integrity of the work as a whole and have given their approval for this version to be published. Hannah Kaiser, Charlotte Näslund-Koch, Amanda Kvist-Hansen and Lone Skov contributed to the study of the design. Hannah Kaiser, Charlotte Näslund-Koch and Amanda Kvist-Hansen drafted the first manuscript, and all authors contributed with revisions. All authors have provided important intellectual input and approved the final version of the manuscript.
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Hannah Kaiser and Amanda Kvist-Hansen have nothing to declare. Lone Skov has received research funding from Novartis, Bristol-Myers Squibb, AbbVie, Janssen Pharmaceuticals, the Danish National Psoriasis Foundation, the LEO Foundation and the Kgl Hofbundtmager Aage Bang Foundation, and honoraria as consultant and/or speaker for AbbVie, Eli Lilly, Novartis, Pfizer, and LEO Pharma, Janssen Cilag, UCB, Almirall, Bristol-Myers Squibb and Sanofi. She has served as an investigator for AbbVie, Pfizer, Amgen, Sanofi, Janssen Cilag, Boehringer Ingelheim, Eli Lilly, Novartis, Galderma and LEO Pharma. Charlotte Näslund Koch has served as an investigator for Galderma, Abbvie, LEO Pharma, Novartis and CSL Behring.
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Kaiser, H., Näslund-Koch, C., Kvist-Hansen, A. et al. Does Systemic Anti-Psoriatic Treatment Impact the Risk of Cardiovascular Disease? A Review Over Cardiovascular Imaging Studies. Dermatol Ther (Heidelb) 14, 303–321 (2024). https://doi.org/10.1007/s13555-024-01098-z
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DOI: https://doi.org/10.1007/s13555-024-01098-z