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MINERVA CARDIOANGIOL 2014;62:437-48

Cardiovascular risk associated with celecoxib or etoricoxib: a meta-analysis of randomized controlled trials which adopted comparison with placebo or naproxen

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R. DE VECCHIS 1, C. BALDI 2, G. DI BIASE 3, C. ARIANO 1 C. CIOPPA 1, A. GIASI 1, L. VALENTE 4, S. CANTATRIONE 1

Aim. The present meta-analysis attempted to assess whether an unfavourable cardiovascular risk profile could be identified in the case of two COX2 selective inhibitors (COXIBs), namely celecoxib and etoricoxib. Based on the data from the literature, our meta-analysis aimed to assess the probability of major cardiovascular events reported with the use of celecoxib or etoricoxib and compare this with the results seen in patients assigned to the placebo group. Furthermore, the risk of cardiovascular events found by using celecoxib or etoricoxib was also compared with that associated with the use of naproxen, a nonselective non-steroidal anti-inflammatory drug (NSAID) chosen as our reference drug. Methods. The studies had to be randomized controlled trials with at least 4-week duration. Studies were included if they compared celecoxib or etoricoxib against placebo or naproxen. Moreover, the selected studies had to have determined the risk, odds or incidence of myocardial infarction, stroke or cardiovascular death. For the comparisons versus placebo, the endpoints of interest were “serious vascular events”, “non-fatal myocardial infarction”, “non-fatal stroke” and “death from cardiovascular causes”, whereas “myocardial infarction” and “stroke” were the endpoints of interest concerning the comparison versus naproxen. Results. From the evaluation of 41 studies comparing celecoxib with placebo, we found a significantly higher incidence of serious vascular events in the celecoxib group compared to controls treated with placebo (rate

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ORIGINAL ARTICLES

Corresponding author: R. De Vecchis, MD, via P. Gaurico 21, 80125 Naples, Italy. E-mail address: [email protected]

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1Cardiology Unit Presidio Sanitario Intermedio “Elena d’Aosta” Naples, Italy 2Heart Department, Interventional Cardiology “San Giovanni di Dio e Ruggi D’Aragona” Hospital, Salerno, Italy 3Neurorehabilitation Unit Clinica “S. Maria del Pozzo” Somma Vesuviana, Naples, Italy 4Orthopedic Outpatient Unit Presidio Sanitario Intermedio “Elena d’Aosta” Naples, Italy

ratio 1.598, 95% CI: 1.048 to 2.438; P=0.029). Furthermore, in patients allocated to treatment with celecoxib, we found an incidence rate of non-fatal acute myocardial infarction that was three times higher compared with the placebo group (rate ratio 3.074, 95% CI: 1.375-6.873, P=0.006). In contrast, we did not find any significant difference with regard to the incidence of nonfatal stroke and that of death from cardiovascular causes by comparing celecoxib and placebo. In addition, by examining cardiovascular outcomes that emerged from the 17 trials which compared etoricoxib with placebo, it was not possible to demonstrate statistically significant differences in incidence for each of the explored endpoints. With regard to the comparison of each coxib with the non-selective COX2 inhibitor naproxen, we did not find any significant difference for either the odds of myocardial infarction or that of stroke. Conclusion. On the basis of our meta-analysis, we can state that symptomatic benefits induced by the prolonged administration of celecoxib may be partially invalidated by a

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n the past years, various in-depth studies have been carried out regarding the alleged effect of triggering thrombogenesis and vasoconstriction exerted by some nonsteroidal anti-inflammatory drugs (NSAIDs), characterized by their selective inhibition of the enzyme cyclooxygenase-2.1-3 These drugs, which have the property of selectively interacting with cyclooxygenase 2, i.e., without impacting on cyclooxygenase 1, are commonly referred to as COXIBs (cyclo-oxygenase-2 inhibitors). The COXIBs were originally introduced on the market with the label of anti-inflammatory drugs free from significant acute gastrolesivity.4 However, a thrombogenic effect was subsequently shown for two of these drugs, namely rofecoxib and valdecoxib,5, 6 whose use was associated with an excess of myocardial infarctions and cardiovascular deaths. Therefore, rofecoxib and valdecoxib were withdrawn from the market in 2004 and 2005, respectively.2 Moreover, for non-selective NSAIDs, the well-known toxic effect on the gastric mucosa could effectively be antagonized by the concomitant administration of drugs that inhibit gastric acid secretion.7 Since myocardial infarction is a more serious side effect than gastritis or a gastroduodenal ulcer, and considering that the non-selective NSAIDs exert an anti-inflammatory effect as powerful as

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that exhibited by COXIBs while showing a lower risk of cardiovascular disease (CVD), the grounds for using the latter would be relatively restricted, especially in the case of patients with chronic inflammatory disease with multiple concomitant CVD risk factors or overt ischemic heart disease.1, 3, 8 Due to these concerns surrounding cardiovascular safety, it is important to exercise adequate vigilance regarding the appropriate use of COXIBs, through the reporting of adverse events occurring during treatment. In order to acquire information about safety, retrospective case-control studies and metaanalyses concerning the cardiovascular outcomes related to these drugs are also useful. Using data from trials in the literature, the present meta-analysis aimed to assess the incidence of major cardiovascular events reported with the use of two COXIBs, namely celecoxib and etoricoxib, and to compare this with the results in patients assigned to the placebo group. Furthermore, the risk of cardiovascular events found by using each of these two molecules was also compared with that associated with the use of naproxen, a non-selective NSAID that was arbitrarily chosen as our reference drug.

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concomitant increase in vascular risk, particularly the increased risk of myocardial infarction found in celecoxib-treated patients, compared to controls taking placebo. In contrast, treatment with etoricoxib proved not to result in an increased risk of serious vascular events when compared with both the placebo and naproxen. Our meta-analysis also denotes that the alternative to COXIBs, represented by naproxen, does not show significant benefit in terms of reduced cardiovascular risk. Therefore, considering that the increase in incidence rate of cardiovascular events associated with treatment with celecoxib is small in absolute terms, it is reasonable to state that celecoxib is still a drug whose benefits outweigh the potential adverse effects on the cardiovascular system. Key words: Cardiovascular diseases - Celecoxib Etoricoxib - Drug safety - Meta analysis.

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DE VECCHIS

Materials and methods

Study selection

The studies assessed had to be randomized controlled trials of at least 4-weeks duration. Studies were included if they compared celecoxib or etoricoxib against placebo or the nonselective NSAID naproxen administered at equivalent analgesic doses. Moreover, the selected studies were required to have reported on the probability of experiencing serious vascular events, i.e. they should have determined the risk, odds or incidence of myocardial infarction, stroke or death from cardiovascular causes. In addition, the methodological quality of included trials had to score a minimum of two points using the Jadad scale.9 The endpoints that were specifically adopted in our meta-analysis were the following: for comparisons

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etoricoxib versus naproxen. For these outcomes, the effect size was expressed by calculating the odds ratio (OR). Statistical analysis Statistical analyses were performed using Review Manager 5.0.4 software (available from the Cochrane Collaboration at: http// www.cochrane.org) and Stata version 10 (Stata Corp LP, College Station, Texas, USA). For comparing the effects of celecoxib or etoricoxib versus placebo on each of the four cardiovascular outcomes of interest, the pooled rate ratio was computed with a 95% confidence interval (CI), using a fixed effects model. Event numbers and person years of exposure were presented in the related forest plots for patients allocated to each COXIB and placebo group. For comparing the effects of celecoxib or etoricoxib versus naproxen on each of the two cardiovascular outcomes of interest, the pooled odds ratio was determined with a 95% confidence interval (CI), within a fixed-effect meta-analysis.

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between COXIBs and placebo, the rate ratios, i.e. the ratios of the respective incidence rates, should have been calculated for the endpoints “non-fatal myocardial infarction”, “non-fatal stroke”, “cardiovascular death” and the composite endpoint “vascular events”, consisting of non-fatal myocardial infarction, non-fatal stroke and cardiovascular death; instead, for the comparison between COXIBs and naproxen, the odds ratio concerning each of the endpoints “myocardial infarction” and “stroke” should have been computed. We used 95% confidence intervals for all measures of dimension size. Search strategy

A systematic search was conducted by adopting the keywords “celecoxib” and “etoricoxib” as search terms in order to retrieve all of the relevant data from the PubMed and Embase electronic archives and the online Clinical Study Results Database (http://www. clinicalstudyresults.org). The search included publications up to March 2014 and no lower date limit was applied. All studies not written in English, duplicated studies, review articles, editorials, and expert opinions were excluded. Eligibility assessment and data extraction were carried out independently by two investigators (RDV and GDB) with any discrepancies resolved by consensus in consultation with a third author (CA). Titles and abstracts served to identify those studies that were suitable for further assessment of the full text.

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Cardiovascular risk associated with celecoxib or etoricoxib

Outcomes of interest

“Serious vascular events”, “non-fatal myocardial infarction”, “non-fatal stroke” and “cardiovascular death” were the outcomes of interest for the comparison of celecoxib and etoricoxib versus placebo. For all of these outcomes, the effect size was expressed using the rate ratio, i.e., the ratio of incidence rates calculated for each outcome of interest in COXIB-treated and placebo groups, respectively. Instead, “myocardial infarction” and “stroke” were the outcomes of interest for comparison of celecoxib and

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Results

Figure 1 outlines the results of the trial selection process. We identified 116 studies, of which 92 RCTs met the inclusion criteria. Of these, 34 RCTs did not report any information about serious vascular events and the remaining 58 were included in our meta-analyses. Overall, the 58 RCTs included 62,634 patients with rheumatoid arthritis (8 trials), osteoarthritis (29 trials), osteoarthritis or rheumatoid arthritis (8 trials), Alzheimer’s disease (2 trials), colorectal adenomas (3 trials), low back pain (5 trials), and ankylosing spondylitis (3 trials). Some details of recruited studies are reported in Table I.13-51

Comparison of celecoxib or etoricoxib versus placebo Figures 2-5 show meta-analyses of each of the two considered selective COX2 inhibitors (celecoxib and etoricoxib) versus

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Cardiovascular risk associated with celecoxib or etoricoxib

Figure 1.—Flow diagram of study selection for meta-analysis. RCTs: double-blind randomized controlled clinical trials.

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DE VECCHIS

placebo for each of the four analyzed outcomes (“serious vascular events”, “non-fatal myocardial infarction”, “non-fatal stroke” and “death from cardiovascular causes”). Indeed, in the setting of various inflammatory or degenerative disorders, we collated a total of 41 trials to compute respective incidences of serious vascular events in the group of patients treated with celecoxib and in that of controls taking placebo. Thus, 84 events were found during 8976 person

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years of exposure to celecoxib (0.9%/year) compared to 29 events during 4953 person years of exposure to placebo (0.6%/year). Therefore, a significantly higher incidence of serious vascular events was evident in the celecoxib group compared to controls treated with placebo (rate ratio 1.598, 95% CI: 1.048 to 2.438; P=0.029). In patients allocated to treatment with celecoxib, we found an incidence rate of non-fatal acute myocardial infarction that was three times

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Table I.—Summary characteristic of included trials. Author (Year) Celecoxib Simon (1998) 13

Disease Rheumatoid arthritis

Simon (1999) 15 Bensen (1999) 14

Osteoarthritis

Kivitz (2001) 20

Sample size

Scheduled duration, weeks

327

4

80/400/800

Yes

No

1148 1102 1092 1214 401 1059 684 715 13194

12 12 12 12 4 12 6 6 12

200/400/800 100/200/400 50/100/200 50/100/200 25/100/400 100/200/400 100/200 100/200 100/200

Yes Yes Yes Yes Yes Yes Yes Yes No

598 404 475 353 371 317 362 316 386 385

6 12 6 6 6 6 6 6 6 4

100 200 200 200 200 200 200 200 200 400

Yes No Yes Yes Yes Yes Yes Yes Yes Yes

83 2035 1561 68 245

24 156 156 6 6

200/800 400/800 400 200 100

Yes Yes Yes Yes Yes

Yes 500 mg bid Yes 500 mg bid Yes500 mg bid Yes 500 mg bid No Yes 500 mg bid No No Diclofenac 50 mg bid Yes 500 mg bid Diclofenac 50 mg bid Yes 500 mg bid No No No Yes 500 mg bid Yes 500 mg bid Yes 500 mg bid Ibuprofen 800 mg tid Nabumetone 1000 mg bid Ibuprofen 800 mg tid No No No Yes 500 mg bid Ketoprofen 100 mg bid

Celecoxib Placebo* dose, mg/day (Yes/No)

Naproxen comparator** (Yes/No)

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Williams (2001) 21

McKenna (2001) 22 Sowers (2005) 43 Gibofsky (2003) 45 Pincus (2004) 23

Palmer (2003) 25

Phillips (2002) 26 Solomon (2005) 27 Levin (2005) 51 Ta (2004) 28 Dougados (2001) 29

Author (Year)

Etoricoxib Curtis (2003) 31

Osteoarthritis/ Rheumatoid arthritis FAP Polyps Polyps TMJ pain Ankylosing spondylitis Disease

Rheumatoid arthritis

Sample size 581

Matsuomoto (2002) 32

816

Collantes (2002) 33

891

Hunt (2003) 34 Tsoukas (2001) 35 Gottesdiener (2002) 36

560 102 617

Osteoarthritis

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Reginster (2004) 37

496

Leung (2002) 38

501

Hunt (2003) 39

182 680 528 387

Wiessenhutter (2005) 40 Van der Heijde (2005) 41 Ankylosing spondylitis Back pain Pallay (2004) 42 Birbara (2003) 24 Hunt (2003) 39 Other DiBattiste (2004)30

325 319 62 433

Scheduled duration, weeks

Etoricoxib dose, mg/day Placebo*

174 (8 placebo) 121 (12 placebo) 121 (12 placebo) 12 6 190 (6 placebo) 138 (12 placebo) 138 (12 placebo) 12 12 12 52 (6 placebo) 12 12 4 12

Naproxen comparator** (Yes/No)

60/90/120

Yes

Diclofenac 50 mg tid

90/120

Yes

Yes 500 mg bid

90/120

Yes

Yes 500 mg bid

120 90 30/60/90

Yes Yes Yes

Yes 500 mg bid No Diclofenac 50 mg tid

60

Yes

Yes 500 mg bid

60

Yes

Yes 500 mg bid

120 120 30 90/120

Yes Yes Yes Yes

Yes 500 mg bid Ibuprofen 800 mg tid Ibuprofen 800 mg tid Yes 500 mg bid

60/90 60/90 120 90

Yes Yes Yes Yes

No No Ibuprofen 800 mg tid Ibuprofen 800 mg tid Celecoxib 200 mg bid

*Trials with a placebo arm are indicated by a yes; ** Trials with a naproxen arm are indicated by a yes followed by the naproxen dose.

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Discussion Some issues should be underscored. Firstly, our research only focused on two molecules, celecoxib and etoricoxib, as they are the only COXIBs currently approved for marketing in Europe (following the withdrawal of rofecoxib from the market in 2004 and valdecoxib in 2005). Therefore, the choice of limiting the metaanalysis by considering only those COXIBs that are used in current medical practice for calculations seemed appropriate in order to adhere to the “real world” of drug prescriptions. In addition, our research not only included studies comparing the two COXIBs and the placebo, but also those in which a COXIB (celecoxib or etoricoxib) was compared with the non-selective COX2 inhibitor naproxen. In fact, naproxen was chosen because it was frequently assumed as a representative molecule of the class of NSAIDs in several controlled clinical trials;10, 11 notably, it is the most widely used NSAID within trials that evaluate the COXIBs. Furthermore, unlike other NSAIDs, naproxen holds the well-recognized property of exerting nonselective action on the cyclo-oxygenase system which results in a well-balanced enzyme inhibition against both COX1 and COX2.12 Therefore, in our meta-analysis, naproxen was adopted as a reference drug of the NSAIDs class, as opposed to COXIBs, which, by definition, exert weak or no inhibitory action against COX1, due to their sole elective affinity for COX2. From our meta-analysis, it is plausible to infer that celecoxib but not etoricoxib is associated with an excess of cases of nonfatal myocardial infarction (Figures 2, 4) compared to placebo. In particular, the increased incidence rate of myocardial infarction in patients treated with celecoxib compared to those on placebo has been shown to decisively contribute to generating a pooled rate ratio indicating a significantly increased risk of serious vascular events (Figure 3) in the celecoxib group compared to placebo. We did not find any significant difference when comparing celecoxib to placebo with regard to the endpoints of nonfatal stroke

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higher than that reported for the placebo group (rate ratio 3.074, 95% CI: 1.375-6.873, P=0.006). In contrast, we did not find any significant difference with regard to the incidence of nonfatal stroke and that of death from cardiovascular causes by comparing celecoxib and placebo. Therefore, we can say that the higher overall incidence of serious vascular events in the celecoxib group is largely due to the significantly increased incidence of nonfatal myocardial infarction in this group compared to placebo. In addition, by examining cardiovascular outcomes that emerged from the 17 trials which compared etoricoxib with placebo, it was not possible to demonstrate statistically significant incidence differences for each of the four explored endpoints (“serious vascular events”, “non-fatal myocardial infarction, “non-fatal stroke” and “death from cardiovascular causes”). By pooling the results of the 41 RCTs that compared celecoxib with placebo and 17 RCTs concerning comparison between etoricoxib and placebo, the pooled rate ratios appear to indicate an adverse effect of the two COXIBs with regard to serious vascular events and non-fatal myocardial infarction (Figures 2-4); in contrast, the rate ratios for nonfatal stroke and death from cardiovascular causes do not indicate any statistically significant difference with respect to placebo (Figures 2, 5, 6). Comparison of celecoxib or etoricoxib versus naproxen

Furthermore, a comparison was made between each of the two COXIBs and the non-selective NSAID naproxen. The cardiovascular outcomes that were chosen (myocardial infarction and stroke) were evaluated separately for celecoxib (6 RCTs for myocardial infarction and 4 for stroke) and for etoricoxib (2 RCTs for myocardial infarction and one for stroke). The relevant pooled odds ratios are reported in Figures 7 and 8. Overall, by comparing celecoxib with naproxen, as well as etoricoxib with naproxen, we did not find any significant difference regarding both the odds of myocardial infarction and that of stroke.

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Cardiovascular risk associated with celecoxib or etoricoxib

Figure 2.—The figure shows the incidence of total vascular events, non-fatal myocardial infarction, non-fatal stroke and death from cardiovascular causes in patients treated with COX-2 selective inhibitors (Coxibs) compared with those receiving placebo. More precisely, for each of the 4 above mentioned endpoints, the corresponding ratio of incidence rates (rate ratio), derived by comparing Coxib and placebo groups, was calculated and reported in the provided column. Among the Coxibs, only celecoxib and etoricoxib were considered for the present meta-analysis. The incidence rates are reported as the “events/person-years” ratio in the relevant column. The overall rate ratio for each of the 4 endpoints is indicated by a diamond. Moreover, the rate ratio for the comparison between each Coxib and the placebo is indicated by a dark square. The horizontal lines represent the 95% confidence intervals for each value of the rate ratio. The data are derived from the pooling of 41 randomized trials for celecoxib and 17 randomized trials for etoricoxib. The incidence of vascular events on the whole, and especially that of non-fatal myocardial infarction is significantly higher in the Coxib group as a result of an increase in vascular events reported in the subset of patients treated with celecoxib.

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Figure 3.—Rate ratios concerning the endpoint”serious vascular events” (that is, non-fatal myocardial infarction, nonfatal stroke, or vascular death) in patients treated with a coxib (celecoxib or etoricoxib) compared to patients taking placebo.

Figure 4.—Rate ratios concerning non-fatal myocardial infarction in patients treated with a coxib (celecoxib or etoricoxib) compared to patients taking placebo. A significantly higher incidence rate of non-fatal myocardial infarction in the celecoxib group compared to placebo group is noticeable (rate ratio=3.074, 95% CI: 1.375 to 6.873; P=0.006).

Figure 5.—Rate ratios concerning non-fatal stroke in patients treated with a coxib (celecoxib or etoricoxib) compared to patients taking placebo. There is no difference in the incidence of non-fatal stroke in the comparison between patients taking a Coxib (celecoxib or etoricoxib) and those receiving the placebo.

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Figure 6.—Rate ratios concerning death from cardiovascular causes in patients treated with a coxib (celecoxib or etoricoxib) compared to patients taking placebo. There is no difference in the incidence of cardiovascular death in the comparison between patients taking a Coxib (celecoxib or etoricoxib) and those receiving the placebo.

Figure 7.—Odds ratios concerning myocardial infarction in patients treated with a Coxib (celecoxib or etoricoxib) compared to those taking naproxen. The probability of myocardial infarction in patients treated with a Coxib is not significantly different from that found in patients taking naproxen.

Figure 8.—Odds ratios concerning stroke in patients treated with a Coxib (celecoxib or etoricoxib) compared to those taking naproxen. The probability of stroke in patients treated with a Coxib is not significantly different from that found in patients taking naproxen.

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In fact, the current guidelines state that COXIBs are not safe for use in patients with known ischemic heart disease, but they accept their use in patients without any history of overt ischemic heart disease for the symptomatic treatment of painful inflammatory conditions, provided that clinicians have considered and carefully weighted the risk of coronary ischemic events that may result from prolonged COXIB administration (i.e., maintained for periods longer than 4 weeks), particularly in patients with one or more risk factors for ischemic heart disease.

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and death from vascular causes (Figures 5, 6). In addition, celecoxib compared with naproxen showed a similar risk for the endpoints myocardial infarction and stroke (Figures 7, 8). With regard to etoricoxib, no significant differences versus both placebo and naproxen were detected for each of the endpoints of interest considered. The risk of nonfatal myocardial infarction appears to be the parameter that is most unfavourably influenced by celecoxib. In fact, our meta-analysis reported a rate ratio of 3, i.e. a triple incidence rate of non-fatal myocardial infarction in patients treated with celecoxib compared to controls randomized to placebo. This equates to an incidence of myocardial infarction of 0.43%/year in the celecoxib group compared with an incidence of 0.14%/year in the placebo group. In other words, the prolonged administration of celecoxib carried out to counteract the inflammation and pain of various osteoarticular diseases produces symptomatic benefits that could be outweighed or cancelled out by a concomitant increase in vascular risk, particularly the increased risk of myocardial infarction, compared to patients with the same diseases that are excluded from the analgesic-anti-inflammatory therapy with celecoxib. Nevertheless, our analysis also denotes that the alternative to COXIBs represented by naproxen does not show any significant benefit in terms of reduced vascular risk. Therefore, considering that the increase in the incidence rate of cardiovascular events with celecoxib is small in absolute terms, it is reasonable to state that celecoxib is still a drug whose benefits outweigh the adverse effects on the cardiovascular system. We did not identify any lower proportion of adverse vascular events (myocardial infarction and stroke) with the use of naproxen compared with celecoxib. Moreover, etoricoxib proved not to be burdened with an increased risk of serious vascular events versus both the placebo and naproxen. Therefore, on the basis of this meta-analysis, there is no reason to change the current guidelines for these two drugs.

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Conclusions

In patients with osteoarticular pain and inflammation (rheumatoid arthritis, osteoarthritis), symptomatic benefits obtained using celecoxib have been shown to be accompanied by a concomitant increase in vascular risk, particularly the increased risk of myocardial infarction found in celecoxib-treated patients, compared to controls treated with placebo. In contrast, etoricoxib did not entail an increased risk of serious vascular events versus both the placebo and naproxen. Moreover, naproxen, when given as an alternative to celecoxib, did not show any significant benefits in terms of reduced vascular risk. Therefore, considering that the increased incidence of cardiovascular events with celecoxib compared to placebo is small in absolute terms, it is reasonable to state that celecoxib is still a drug whose benefits outweigh the potential adverse effects on the cardiovascular system. References

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