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J Thromb Thrombolysis. Author manuscript; available in PMC 2012 May 1.
Published in final edited form as:
PMCID: PMC3338886

Statins, inflammation and deep vein thrombosis: a systematic review


Venous thromboembolism (VTE) includes both deep vein thrombosis (DVT) and pulmonary embolism. The 2009 JUPITER trial showed a significant decrease in DVT in non-hyperlipidemic patients, with elevated C-reactive protein (CRP) levels, treated with rosuvastatin. The effects of statins on thrombosis are unclear, prompting this literature review. A literature search was performed (1950 to February 2011) with MEDLINE, EMBASE, and PUBMED databases including the following keywords: “statins”, “hydroxymethylglutaryl-CoA reductase inhibitors”, “VTE”, “PE”, “DVT”, and either “anti-coagulation” or “inflammation”. Editorials, reviews, case reports, meta-analysis and duplicates were excluded. Inflammatory biomarkers of DVT, include interleukin (IL)-6, CRP, IL-8, and monocyte chemotactic protein 1 (MCP-1). Statin therapy reduces IL-6 expression of CRP and MCP-1, usually elevated in VTE. Reduction of IL-6 induced MCP-1 has been linked to vein wall fibrosis, promoting post thrombotic syndrome (PTS) and recurrent DVT in patients. Also, our review suggests that the anti-thrombotic effects are likely exhibited through the anti-inflammatory properties of statins. This work supports that statin therapy has the ability to decrease the incidence and recurrence of VTE and the potential to decrease PTS. This is mainly due to the anti-inflammatory effects of statins and may explain why normolipidemic patients, with elevated CRP, appear to have the greatest reduction in VTE. Given their low risk of bleeding, statins have the potential to serve as a safe adjunctive pharmacological therapy to current treatments in select patients with VTE, however further investigations into this concept are needed and essential.

Keywords: Biomarker, Deep vein thrombosis, Inflammation, Anti-coagulation, Statins, Venous thromboembolism


Venous thromboembolism (VTE) comprises deep vein thrombosis (DVT) and pulmonary embolism (PE). In a recent study, the estimated total annual cases of VTE occurring in the United States exceeded 900,000, of which more than 250,000 were fatal [1]. An international study that involved six countries within the European Union, reported 465,715 estimated annual cases of DVT; 295,982 PE events and 370,012 VTE-related deaths [2]. Clinically, DVT is divided into two distinct phases: acute and chronic. It is during the acute phase of DVT that PE, a serious and potentially fatal condition may occur as a result of a dislodged thrombus. In addition, post-thrombotic syndrome (PTS), which is a long-term sequelae of DVT [35], affects 23–60% of patients and carries with it a high level of morbidity [6]. Despite the progress in medicine and vascular biology, there has been no decrease in the incidence of VTE in the last 25 years [7]. The standard protocol for a patient presenting with a DVT is initial treatment with heparin, followed by long-term anticoagulation with warfarin in order to reduce the chance of PE, complications of PTS and recurrence of DVT. However, all of these medications are associated with a high risk of bleeding [8]. An overview of bleeding complications demonstrated that the rate of intracranial bleeding was 1.15% per year and the case fatality rate of major bleeding was 13% [8]. Thus, investigation into new treatment options for DVT is warranted.

The effect of statins on DVT was brought to light in 2009 through a clinical randomized controlled trial (RCT) called the JUPITER Trial. In this study, relatively healthy people with high levels of C-reactive protein (CRP) and normal low density lipoprotein cholesterol (LDL-C) levels, were given either a placebo or rosuvastatin [9]. It showed that the rate of DVT was significantly decreased in patients treated with rosuvastatin versus controls, 34 versus 60 patients respectively, with a median follow-up point of 1.9 years [9]. Rosuvastatin, along with other statins, inhibits hydroxymethylglutaryl (HMG)-CoA reductase, and are used as a treatment for hypercholesterolemia.

Several mechanisms have been proposed for the reduction in thrombosis in patients treated with statins, including decreased tissue factor [10, 11], plasminogen activator inhibitor-1 (PAI-1) [11, 12], increased tissue plasminogen activator (tPA) expression, decreased platelet aggregation, and increased thrombomodulin expression [11, 13]. The effect of rosuvastatin on DVT is not clear, and its investigation will provide an important contribution to the field. In addition to their anti-thrombotic/anti-inflammatory potential, statins have years of data that show no bleeding side effects, making them a potential adjunctive therapy for DVT. We have thus conducted a systematic review of the literature regarding the non-lipid effects of statins and the potential link between DVT, inflammation, and statins. We hypothesize that DVT, inflammation and statins are interrelated due to the probable anti-thrombotic and anti-inflammatory properties of statins.

Materials and methods

Eligibility criteria

The literature search was limited to the English language. All articles primarily related to DVT, statins, anti-coagulation, and inflammation were evaluated to determine if they met inclusion criteria. Editorials, reviews, case series, and duplicates were then excluded. Reviews of similar topics were read by the authors, but not included as a primary study. A review of references from the final list of manuscripts was done in order to include all pertinent studies not obtained in our search.

Search strategy

An English language literature search from 1950 to February 2011 was performed with MEDLINE, EMBASE, and PUBMED databases. The search included the following keywords: “statins”, “HMG-CoA reductase inhibitors”, “venous thromboembolism”, “pulmonary embolism”, “deep vein thrombosis”, and either or “inflammation”. The inclusion and exclusion criteria as well as the results of the search are outlined in Figs. 1 and and2.2. A total of 911 manuscripts were initially identified, after removal of duplicates the remaining 877 abstracts [598 anti-coagulation, Fig. 1 + 279 inflammation, Fig. 2] were then reviewed. Two independent reviewers evaluated all abstracts (A.L.R. and J.A.D.) based on the inclusion and exclusion criteria. All relevant review articles generated by the search were analyzed. In addition, articles were added to the final analysis based on evaluation of the references of the articles previously included, and using the same inclusion/exclusion criteria applied for the systematic review (Fig. 3). Disputes between authors on inclusion were reexamined together and only those that were agreed upon by both authors were included in the final analysis.

Data review and analysis

A standardized data retrieval form was created. Two independent reviewers (A.L.R. and J.A.D.) evaluated data extracted from articles including: study design, patient population, sample size, interventions, primary end point, and primary and secondary outcomes. Articles were then sub-classified into subject areas in order to allow for a more efficient analysis.


A total of 29 articles were identified that fit the eligibility criteria, shown in Figs. 1 and and2.2. Common investigative topics were identified and articles categorized by subject (Fig. 3). The inflammatory biomarkers and inflammatory events that were reviewed in this work are shown in Table 1.

Table 1
Inflammatory biomarkers and inflammatory events included in this manuscript that fit the eligibility criteria

Inflammation and DVT

The link between DVT and inflammation facilitating thrombosis and the development of post-thrombotic syndrome (PTS) was discussed in 9 clinical studies (2 cohort studies, 3 prospective non randomized, 4 case–control studies) and 6 basic science animal studies[1428] (Table 2, Section 1).

Table 2
Articles included in this manuscript that fit the eligibility criteria

While multiple biomarkers were shown to increase the risk of thrombosis, interleukin (IL)-6, IL-8, P-selectin, monocyte chemotactic protein 1 (MCP-1), tumor necrosis factor alpha (TNFα), and CRP each demonstrated a prothrombotic effect in two or more studies. In particular, IL-6, IL-8, and CRP were elevated on the first day of admission for patients with DVT [19]. In terms of recurrent DVT, IL-6, IL-8, and MCP-1 were increased in patients after their first thrombotic event [22]. Regarding potential mechanisms, inhibition of IL-6 was shown to reduce the effects of PTS following DVT in a mouse model of DVT, likely by down-regulating synthesis of MCP-1 [28]. TNFα was elevated in a primate model of DVT [26]. Additionally, TNFα inhibition, in a rat model of DVT, led to a reduction in thrombosis [27]. Soluble P-selectin (sP-selectin) was elevated in patients with recurrent VTE during at least one unprovoked event of DVT or PE [15]. Additionally, inhibition of P-selectin was found to reduce venous thrombosis and vein wall inflammation in rats and primates [17, 27].

While the majority of the studies report a correlation between an increased thrombotic effect with the inflammatory biomarker of interest, other studies found that certain inflammatory markers were associated with thrombus resolution. A rodent model of DVT in which animals were injected with IL-8 showed increased vascular endothelial growth factor and thrombus resolution compared to controls [16]. Additionally, IL-6, MCP-1 and high sensitivity C-reactive protein (hs-CRP) were each shown in single studies to have no correlation with thrombosis [24, 25].

Statins and inflammation

The relationship between statins and inflammation was investigated in 2 RCTs, 1 cross-sectional study and 4 basic science (one including serum inflammatory biomarkers [29]) studies [2935]. There is increasing evidence in support of statins having an anti-inflammatory effect and this is substantiated by 6 of the 7 articles (Table 2, Section 2).

Statins were associated with reductions in CRP, IL-6, IL-8, MCP-1, and PAI-1 [2933, 35]. In addition, statins were also associated with increased levels of endothelial nitric oxide synthase (eNOS), thrombomodulin, and apolipoprotein A1 [33, 35]. The patient populations across the studies, showing an anti-inflammatory effect, included men and women with and without a history of cardiovascular disease or currently suffering from myocardial infarction along with matched controls. Basic science studies showed decreased inflammatory biomarkers with statin use across multiple cell lines including, hepatocytes, human aortic endothelial cells, and human umbilical vein endothelial cells (HUVEC) [29, 31, 33, 35].

One RCT did not support the possible anti-inflammatory effects of statins. The patient population in this study included normolipidemic patients with normal CRP levels who received short-term high dose therapy with atorvastatin. The authors investigated several plasma inflammatory biomarkers and found no association with statin use [34].

Statins and DVT

The potential anti-thrombotic nature of statins was elucidated in 1 RCTs, 4 case–controlled studies, 1 retrospective cohort study and 1 basic science study [9, 3641]. All 7 studies, including the JUPITER trial, concluded that statin use was associated with a decreased rate of DVT, PE, or overall VTE (Table 2, Section 3).

The JUPITER trial was a prospective clinical RCT involving 17,802 patients, in 26 countries, and included a 5-year follow up [9]. This study showed a decreased incidence of DVT in patients, with normal LDL-C levels and elevated CRP, treated with rosuvastatin, 20 mg daily [9]. Several prospective and retrospective studies have demonstrated a similar effect on other patient populations including post-menopausal woman, patients with solid organ tumors for 2 months, and patients with recurrent DVT [3638, 40, 41]. One case–control study concluded that pravastatin had a greater effect on reducing DVT rate than simvastatin, suggesting a difference in efficacy by statin type [40]. A potential mechanism is elucidated in a rodent study in which an atorvastatin derivative caused a release of nitric oxide, leading to a vasorelaxant effect [39].


The recent JUPITER trial showed that statins might be beneficial for patients suffering from deep vein thrombosis. The JUPITER trial involved 17,802 non-hyperlipidemic patients with elevated CRP levels where rosuvastatin treatment caused a significant decrease in the rate of DVT [9]. This prompted our review of the literature in order to determine what evidence currently exists in support of or in opposition to this claim.

Multiple inflammatory biomarkers were found to be associated with VTE including IL-6, IL-8, sP-selectin, MCP-1, TNFα, and CRP. However, it is difficult to conclude whether the elevations in these biomarkers are from systemic inflammation or play an integral part in the formation of thrombosis. Direct inhibition of IL-6, TNFα, and P-selectin was found to reduce VTE and its sequelae, PTS [17, 27, 28]. This evidence supports pharmacological therapy targeted at inflammatory mediators to decrease the incidence and recurrence of VTE and may explain the underlying anti-thrombotic effect of statins.

In fact, several studies found that statin use led to decreased levels of inflammatory biomarkers including IL-6, IL-8, MCP-1 and CRP. These inflammatory biomarkers were specifically found to be elevated in patients with VTE and affected the physiology of endothelial cells. Most of the current research involving statins and inflammation focuses on the arterial side of the circulation and while this review aims to discuss mainly the venous side, it is important to look at biomarkers that both have in common. IL-6 was the most common inflammatory biomarker analyzed and is primarily studied because it is a known regulator in the activation of an acute phase response. It is usually analyzed both on an individual basis and also in conjunction with IL-8, MCP-1, and CRP [31, 32, 34]. The study by Arnaud et al. [31] looked at levels of IL-6 induced CRP in which they found them to be decreased by statins. In addition, the study by Jougaski also examined levels of MCP-1, a cytokine that is induced by IL-6. This study found that statins suppressed IL-6 induced MCP-1 expression [33]. One RCT that analyzed plasma inflammatory biomarkers by Millar et al. [34], found no changes in the expression of IL-6, hs-CRP and other inflammatory biomarkers with either the in vivo or ex vivo use of statins. However, the patient population consisted of normolipidemic adults with normal CRP levels, versus the elevated CRP levels in the participants of the JUPITER trial, suggesting baseline CRP levels are an important marker in predicting the efficacy of reducing VTE with statins [9, 34].

Statin therapy was found to reduce VTE in all studies included in this review. While many patient populations were studied, the strong support for effective statin use exists for normolipidemic patients with elevated levels of CRP, indicating increased inflammation. The studies were comprised of various statins including: pravastatin, simvastatin, atorvastatin, rosuvastatin, lovastatin, fluvastatin and cerivastatin. The degree of risk reduction was found to differ between statins. Khemasuwan et al. [37], Ramcharan et al. [40], and Doggen et al. [36] were all in accordance with the beneficial effect of simvastatin in decreasing the rate of DVT, but a discrepancy was seen in regards to the level of benefit conferred by this statin in comparison to others. Khemasuwan et al. [37] found simvastatin led to fewer occurrences of DVT, when compared to atorvastatin. Ramcharan discovered a beneficial preventative effect of DVT with pravastatin, which was higher in comparison to simvastatin. Doggen found that pravastatin showed no benefit in reducing the rate of DVT and the initial protective effect on DVT observed was seen only in those treated with simvastatin [36, 37]. While this observation made by Doggen is in opposition to the conclusion made by Ramcharan, the number of patients in Doggen’s study using simvastatin was approximately three times higher than those treated with pravastatin (simvastatin 16:5 pravastatin). This discrepancy brings into question the reliability of this conclusion. Furthermore, this study was conducted only in postmenopausal women, which decreases the ability to generalize results and accurately compare them to those from the other studies. The remainder of the studies reviewed consisted of both male and female participants in approximately equal ratios [9, 3641].

In summary, there is overwhelming support that statin therapy has the ability to decrease the incidence and recurrence of VTE. Further work must be done to uncover the mechanism leading to this anti-thrombotic affect and to more clearly define appropriate patient populations. However, our review suggests that the anti-thrombotic effects are likely exhibited through the anti-inflammatory properties of statins. Cytokines that most likely are involved include IL-6, IL-8, CRP, and MCP-1. Specifically, statin therapy reduces the IL-6 induced expression of both CRP and MCP-1, which are elevated in patients with VTE [3133]. Reduction of IL-6 induced MCP-1 has also been linked to vein wall fibrosis, which would predispose a patient to PTS and recurrent DVT [28]. Collectively, this may explain why anti-inflammatory effects of statins in normolipidemic patients, with elevated CRP levels, appear to lead to the greatest reduction in the incidence and recurrence of VTE and potentially could decrease the incidence of PTS. Given their low risk of bleeding, statins have the potential to serve as a safe adjunctive pharmacological therapy to current treatments in select patients with VTE, however further investigations into this concept are needed and essential.


It may be possible that positive findings tend to be published much more often than negative or non-conclusive findings. This was observed in the articles that matched our criteria as most of them tended to have findings that supported one viewpoint. This may leads to a bias in terms of the availability of data that is either in support of or in opposition to the link between statins, inflammation and DVT. Another limitation is the fact that the manuscripts included within this review cover very heterogeneous topics with regards to DVT (inflammatory response to acute DVT, chronic inflammation following DVT, post thrombotic syndrome). In addition, the vast majority of the literature focuses more on inflammatory cytokines rather than on cell-based mechanisms. This then leaves another area to be explored with regards to the impact of statins on DVT and inflammation.

Future directions

There is a necessity for more RCTs in order to adequately identify the relationship between DVT and statins in a structured setting and to differentiate between specific statins and doses. There is also a need to investigate the use of statins for both prophylaxis and treatment, in addition to doing comparison studies of statins with and without current therapy or standard care.


This work supported in part by NIH 1PO1HL089407. The authors also would like to acknowledge and extend their gratitude to the Michigan Institute for Clinical & Health Research (MCRiT) program, all the members of the Jobst Vascular Surgery Laboratory at the University of Michigan for their time, training, encouragement and continued support.


Venous thromboembolism
Deep vein thrombosis
Pulmonary embolism
Post-thrombotic syndrome
Randomized controlled trial
C-reactive protein
Low density lipoprotein cholesterol
reductase Hydroxymethylglutaryl-CoA reductase
Plasminogen activator inhibitor-1
Tissue plasminogen activator
Monocyte chemotactic protein 1
Tumor necrosis factor alpha
Soluble P-selectin
High sensitivity C-reactive protein
Endothelial nitric oxide synthase
Human umbilical vein endothelial cells

Contributor Information

April L. Rodriguez, Department of Surgery, Section of Vascular Surgery, Conrad Jobst Vascular Research Laboratories, School of Medicine, University of Michigan, A570A MSRB II, 1150 W. Medical Center Dr., Dock #6, Ann Arbor, MI 48109, USA.

Brandon M. Wojcik, Department of Surgery, Section of Vascular Surgery, Conrad Jobst Vascular Research Laboratories, School of Medicine, University of Michigan, A570A MSRB II, 1150 W. Medical Center Dr., Dock #6, Ann Arbor, MI 48109, USA.

Shirley K. Wrobleski, Department of Surgery, Section of Vascular Surgery, Conrad Jobst Vascular Research Laboratories, School of Medicine, University of Michigan, A570A MSRB II, 1150 W. Medical Center Dr., Dock #6, Ann Arbor, MI 48109, USA.

Daniel D. Myers, Jr., Department of Surgery, Section of Vascular Surgery, Conrad Jobst Vascular Research Laboratories, School of Medicine, University of Michigan, A570A MSRB II, 1150 W. Medical Center Dr., Dock #6, Ann Arbor, MI 48109, USA. Unit for Laboratory Animal Medicine, University of Michigan, Ann Arbor, MI, USA.

Thomas W. Wakefield, Department of Surgery, Section of Vascular Surgery, Conrad Jobst Vascular Research Laboratories, School of Medicine, University of Michigan, A570A MSRB II, 1150 W. Medical Center Dr., Dock #6, Ann Arbor, MI 48109, USA.

Jose A. Diaz, Department of Surgery, Section of Vascular Surgery, Conrad Jobst Vascular Research Laboratories, School of Medicine, University of Michigan, A570A MSRB II, 1150 W. Medical Center Dr., Dock #6, Ann Arbor, MI 48109, USA.


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