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Ann Rheum Dis. Jul 2007; 66(7): 880–885.
Published online Feb 23, 2007. doi:  10.1136/ard.2006.067660
PMCID: PMC1955107

All‐cause and cause‐specific mortality in rheumatoid arthritis are not greater than expected when treated with tumour necrosis factor antagonists

Abstract

Background

Mortality is increased in rheumatoid arthritis (RA), mainly because of cardiovascular (CV) events, cancer and infections. Recent data suggest that treatment with tumour necrosis factor (TNF) antagonists may affect this trend.

Objective

To assess whether treatment with TNF antagonists is associated with reduction in CV events, cancer and infection rates, and in mortality in patients with RA treated and not treated with TNF antagonists.

Methods

BIOBADASER is a registry for active long‐term follow‐up of safety of biological treatments in patients with RA. It includes 4459 patients with RA treated with TNF antagonists. EMECAR is an external RA cohort (n = 789) established to define the characteristics of the disease in Spain and to assess comorbidity. The incidence density (ischaemic heart disease) of CV events, cancer and infections was estimated and compared. The standardised mortality ratio was compared with the rate in the general population. A propensity score was used to match cohorts by the probability of being treated.

Results

Rates of CV and cancer events are significantly higher in EMECAR than in BIOBADASER (RR 5–7 for different CV events, and RR 2.9 for cancer), whereas the rate of serious infections is significantly higher in BIOBADASER (RR 1.6). Mortality ratio of BIOBADASER by EMECAR is 0.32 (0.20–0.53) for all causes of death, 0.58 (0.24–1.41) for CV events, 0.52 (0.21–1.29) for infection and 0.36 (0.10–1.30) for cancer‐related deaths.

Conclusion

Morbidity, other than infection, and mortality are not higher than expected in patients with RA treated with TNF antagonists.

In most studies, mortality in rheumatoid arthritis (RA) is higher than expected.1,2,3 This excess of mortality pertains largely to cardiovascular (CV) diseases as in the general population, yet in RA4,5,6,7 traditional CV risk factors do not satisfactorily account for the surplus of deaths.8,9 In fact, high levels of inflammation reflected by activity scores or extra‐articular disease are more robust predictors of premature CV mortality than high cholesterol level or high blood pressure.10,11 In RA12,13,14 and in artheriosclerosis,15 chronic inflammation plays a role as an atherogenic factor.16 Early and aggressive control of the inflammation results in improved survival.4,17,18,19,20 Additional conditions contributing to the excess of mortality in RA are infections and cancer. Both infections and cancer are related to the extent and severity of arthritis.2,11,21,22 Interestingly, patients with RA with more severe disease are currently treated with TNF antagonists, which are associated with serious infections and with malignancies,23 and deterioration of heart function and heart failure.24 Taking all this information together, our objective in the present work was to analyse the net effect of TNF antagonists on all‐cause mortality in RA, and particularly on death from CV disease, malignancies and infectious causes.16,17,18,19,20,25,26,27

Patients and methods

The present study is based on the comparison of two nationwide cohorts, one available from a drug registry, BIOBADASER (2001–6), and the other, EMECAR (1999–2005), from a cohort of patients with RA. Both BIOBADASER and EMECAR cohort studies were approved by their corresponding ethical committees.

The BIOBADASER cohort

A description of BIOBADASER has been published elsewhere.28,29,30 BIOBADASER is a drug safety registry launched in February 2000 for active long‐term follow‐up of patients with RA treated with biological response modifiers. The registry has generated an open cohort of patients in 100 participating centres of patients starting treatment for the first time with a TNF antagonist and followed thereafter. The registry protocol and materials were approved by the Spanish Medicines Agency, and data regarding patients were gathered according to the present official regulations on data protection. Any change in the treatment as well as relevant adverse events (AEs) occurring during follow‐up are registered.

Data collected systematically include gender, date of birth, diagnosis and date of diagnosis of the patients, treatment type and dates of initiation and of discontinuation of the treatment. When a patient has a relevant AE, additional data are registered, including the date of occurrence, type and classification of AE according to the World Health Organization Dictionary of adverse drug reactions, outcome of AE, concomitant treatment and comorbidity. AEs are reported as they occur. Once a year, all participants are requested to update the patients registered in their centre, prior to downloading the database for analysis. Furthermore, completeness and agreement of data with patients' charts are assessed in situ by yearly audits of 10% of the patients registered in BIOBADASER, chosen randomly. A total of 665 clinical records from 82 centres were reviewed in the audit before the present analysis; 14% of entries had errors in notifications. All inaccuracies were corrected accordingly, yielding an expected error of 11%. Patients coming from centres where the audits revealed incompleteness of the data (n = 12) were censored at the time of the last reliable information. To improve comparability with the EMECAR cohort, only data from patients with RA who had been in the registry before January 2002 were analysed (n = 789), thus ensuring a similar observation time of 5 years with EMECAR.

The EMECAR cohort

The EMECAR cohort has also been described previously.31,32,33 It comprises 789 patients in whom clinical expression, disease activity and progression of the disease, and comorbidity have been prospectively collected in yearly visits for 5 years according to a structured protocol. EMECAR strengths are that (1) it represents the Spanish population with RA, as it was assembled by random sampling from clinical databases of 34 rheumatology units; (2) it was started in 1999, before any biological treatment was available in Spain; and (3) it was assembled specifically to assess comorbidity and mortality in RA. For the present study, all data on patients in EMECAR who were treated during the observational period with TNF antagonists were censored at the time of the first dose. The numbers of patients starting treatment with TNF antagonists in EMECAR at 1, 3 and 5 years of follow‐up were 11 (1.4%), 63 (10.5%) and 78 (16.8%), respectively.

The BIOBADASER subsample

As neither comorbidity nor clinical data were collected at baseline in BIOBADASER, four participating centres were asked to report these specific data. The centres were selected on the following bases: (a) being from four different regions (north, south, east and central Spain); (b) having contributed information on at least 100 patients in the registry; and (c) having their patients in prospective clinical cohorts, thus ensuring good‐quality data. In total, these four centres contributed information on 437 patients with RA (67 in the registry before January 2002). Figure 11 shows the flow of selection of patients to make both cohorts comparable.

figure ar67660.f1
Figure 1 Flow chart of the selection of patients to make patients in both cohorts comparable. In BIOBADASER, only patients with rheumatoid arthritis starting treatment with a tumour necrosis factor antagonist before 2002 were included, thus assuring ...

Definitions of risk factors and cause of death

The working definitions of CV risk factors in the four BIOBADASER centres and EMECAR were similar: (1) Hypercholesterolaemia was defined as a cholesterol level >240 mg/dl (6.5 mmol/l) in two separated occasions, or need for cholesterol‐lowering medication; (2) Hypertension was defined as a systolic blood pressure [gt-or-equal, slanted]140 mm Hg, or as a diastolic blood pressure [gt-or-equal, slanted]90 mm Hg, or the need for antihypertensive treatment; (3) Diabetes was defined by the National Institute of Health National Diabetes Data Group criteria of 1979 as fast glucose level [gt-or-equal, slanted]7.8 mmol/l (140 mg/dl) in two separate occasions, or a glucose level [gt-or-equal, slanted]11.1 mmol/l (200 mg/dl) 2 h after taking 75 g of oral glucose in two separate occasions; (4) Obesity was defined as a body mass index [gt-or-equal, slanted]30 kg/cm2. “Smoking habit” had a broader definition in EMECAR as “ever smoking”, whereas in the four BIOBADASER centres a smoking habit was defined as smoking any amount of cigarettes per day at the time of the interview. Date of death and cause of death were obtained from charts, patients' families and regional death registries.

Statistical methods

Student's t and χ2 tests were used to compare differences in baseline variables in BIOBADASER and EMECAR cohorts. Incidence rates per 100 000 patient‐years of CV events, infections and cancer, with 95% CIs, were estimated in the two cohorts. Time of observation for the patients comprised the period from the baseline date until occurrence of any of the following: death from any cause, last reliable audit of a centre (only in BIOBADASER) loss of follow‐up, beginning of any biological treatment (only in EMECAR), or end of follow‐up.

Standardised mortality ratios (SMRs) with 95% CIs were calculated as the ratio of observed by expected deaths by the indirect method, using the 2002 population mortality data of all‐cause and cause‐specific deaths. Data on Spanish mortality stratified by age and gender were obtained from the National Institute of Statistics (Instituto Nacional de Estadística). Mortality ratios and 95% CIs between both cohorts were also calculated, as an effect measure.

Because of a small but statistically significant difference in baseline disease severity between BIOBADASER and EMECAR cohorts, the probability of being treated with biologicals (propensity score) was used to match cases from the BIOBADASER subsample with controls from the single nearest‐neighbour in EMECAR. The propensity score included baseline age, DAS28, disease duration and gender, and it was calculated with STATA‐specific commands.34 The resulting data file of cases and controls was used to compare the effect of exposure to TNF antagonists on mortality, by means of the rate ratio. All analyses were performed by using the statistical program STATA V.9.2.

Results

The selected cohorts with RA provided information on 2868 patient‐years treated with TNF antagonists (BIOBADASER) and 2433 patient‐years (EMECAR) not treated with TNF antagonists. Table 11 shows baseline characteristics of the patients in the two cohorts as well as in the two subsamples; one from the four BIOBADASER centres with prospective cohorts and the other from the controls in the EMECAR cohort matched by the propensity score.

Table thumbnail
Table 1 Baseline characteristics of the patients included in the two cohorts as well as in the two subsamples: subsample 1 includes patients from four BIOBADASER centres, subsample 2 was drawn randomly from EMECAR to match with the BIOBADASER ...

Patients in the EMECAR cohort showed a CV profile similar to the patients in BIOBADASER, except for EMECAR patients being 2 years older and having a higher prevalence of smoking, perhaps because of a broader definition of smoking.

Incidence of CV events, infections and cancer

Table 22 shows the incidence of CV events, infections and cancer in the cohorts, with 95% CIs, in BIOBADASER and in EMECAR. Rates of all CV events and of cancer are significantly higher in EMECAR than in BIOBADASER, whereas the rate of serious infections is higher in BIOBADASER. Given the difference in age in the comparison cohort, incidence rates were stratified by age, 60 years being the stratifying level. Despite the small size of the strata, patients aged >60 years showed a significant difference rate of ischaemic heart disease and cardiac failure in both cohorts.

Table thumbnail
Table 2 Incidence of cardiovascular events, infections and cancer per 100 000 patients‐years, with 95% CIs, in the two cohorts

Mortality

A total of 75 patients in the EMECAR cohort died (32 men and 43 women), but only 50 were expected to die. The main causes of death were CV disease (n = 17; 23%), infection (n = 14; 19%) and cancer (n = 13; 17%). The cause of death was unknown in 14 (19%) patients. In the BIOBADASER cohort, 20 patients died in the same period (5 men and 15 women), but 38 were expected to die. The main causes of death, known in all cases, were infections (n = 7; 35%), CV disease (n = 7; 35%) and cancer (n = 3; 15%). Table 33 shows SMRs in BIOBADASER and EMECAR, by cause of death and sex, and mortality ratios, adjusted by age and sex, between both cohorts (BIOBADASER/EMECAR).

Table thumbnail
Table 3 Standardised mortality ratios and 95% CIs of patients with rheumatoid arthritis treated or not with tumour necrosis factor antagonists with respect to the expected rate in the general population of Spain

When subsamples matched by the propensity score were analysed, SMR for all causes changed in BIOBADASER from a 50% to a 40% reduction and SMR 0.648 (0.079 to 2.342); SMR of men 0 (0 to 6.743), SMR of women 0.788 (0.096 to 2.847). In EMECAR, the change was even more noticeable, with SMR 3.052 (0.832 to 7.814); SMR of men 1.633 (0.041 to 9.100), SMR of women 4.296 (0.886 to 12.554). Given the small sample size, only death from all causes was analysed. The MRR of the BIOBADASER subsample by the EMECAR subsample was 0.324 (0.06 to 1.77), 0.224 (0.04 to 1.31) adjusted by age, and 0.191 (0.03 to 1.30) adjusted by age and gender, reaching significance (p = 0.10).

Discussion

In the present study, we have investigated the impact of TNF antagonists on the survival of patients with RA. Our study shows that mortality from non‐infectious causes is decreased in this selected population as compared with patients with RA not exposed to TNF antagonists. Furthermore, reduction in mortality from cardiac causes seems to be the major reason for this decline. However, a significant increase in the rate of relevant infections in patients treated with TNF antagonists occurs.

There are some limitations to our study. The control cohort was not a true internal cohort. However, the EMECAR cohort was assembled from 90% of hospitals actively including patients in the BIOBADASER registry, and therefore patients in both BIOBADASER and EMECAR cohorts should have received similar care. Patients in EMECAR have milder activity (baseline DAS) and this may be the reason why only few patients received TNF antagonists when available. Nevertheless, EMECAR may replicate the improvement in survival associated with the recent awareness that a more aggressive and early control of disease activity should be the standard of treatment in RA.18,35,36 BIOBADASER patients were on average 2 years younger than EMECAR patients. This may have an impact on CV morbidity and mortality, balanced nonetheless by the larger number of women in EMECAR with a lower mortality. Of note, comorbidities in EMECAR did not diverge substantially from BIOBADASER except for hypertension and smoking habits, both related perhaps to a more active search in EMECAR (designed specifically to study comorbidity in RA) than to a true high prevalence. Activity, and not other factors, was the major drive for the use of TNF antagonists in BIOBADASER. Thus, a bias to the use of TNF antagonists in patients with fewer comorbidities or absence of comorbidities associated with higher mortality does not seem to be the explanation for the differences in mortality in our study. Nevertheless, observational studies of exposed and unexposed patients may differ systematically with regard to variables related to exposure or outcome. However, adjustment by matching exposed and unexposed patients with regard to known conditional exposure prognostic variables (propensity score) as in our work leads to unbiased estimates and tests of exposure effect.37,38 Another potential bias is the incompleteness of the data in BIOBADASER. If we assume 11% error, as revealed by repeated audits, the mortality would still be lower than expected. In the worst scenario, the number of deaths would be 22 instead of 20, the number of patient‐years of follow‐up 2868 I instead of 2550, and the MRR of BIOBADASER by EMECAR 0.280 (0.166 to 0.455).

As the doctors involved in the care of EMECAR patients were largely the same as those treating BIOBADASER patients, the reporting of causes of death should not have differed significantly. This issue may be relevant in the case of deaths from cancer, attributed, on occasions to infection or CV events rather than to the primary condition especially in elderly patients with comorbidities.39,40 Still, the cause of death in EMECAR was unknown in a number of cases. If all these deaths are attributed to a CV cause as is commonly the case, the difference with BIOBADASER would be even larger. On the contrary, attributing the unknown causes of death to infection would probably be more realistic,41 and the rate of deaths from infection in EMECAR and BIOBADASER would be similar.

Basic and clinical studies have demonstrated that CV damage in RA may be, in part, due to a deleterious effect of TNF on the endothelium.42,43 Present data show that TNF blockade is able to partially normalise endothelial function in patients with RA.44,45 Furthermore, an impact of TNF antagonists on the CV‐related mortality has been suggested by preliminary reports46,47 and supported by the finding of a large number of TNFα‐producing monocytes in fresh thrombi from patients with myocardial infarction.48

It could be proposed that patients treated with TNF antagonists could have undergone closer follow‐up and control of comorbidities. This may be one of the reasons why death from cancer, CV disease and infection was lower in BIOBADASER than in EMECAR, despite a higher rate of relevant infections in BIOBADASER. The low rate of death from cancer has been published previously.49 By contrast, recent meta‐analysis of randomised controlled trials showed a clear increase in the incidence of cancer in clinical trials.50 Nevertheless, observational studies have failed to demonstrate such increases in mortality compared with patients with RA not treated with TNF antagonists. This issue needs further investigation.

Finally, comparison of TNF antagonists would have been interesting. Unfortunately, our samples were too small for this purpose. Besides, the observation time for all three biologicals was different as they became available at different times, which may also have an impact on mortality.

In conclusion, mortality in patients with RA who have been treated with TNF antagonists is not different from the general population of similar age and gender. Furthermore, mortality in this cohort of patients is clearly reduced compared with patients with RA not treated with TNF antagonists, owing to the reduction of deaths from non‐infectious causes.

Acknowledgements

The BIOBADASER registry is supported by the Spanish Society of Rheumatology and by the Spanish Medicines and Medical Devices Agency. Started in year 2006, BIOBADASER is also supported by grants of similar quantity from Schering‐Plough, Wyeth, Abbott Immunology, Roche Farma and Bristol‐Myers Squibb, Spain. The EMECAR cohort was supported by the Spanish Society of Rheumatology and by Aventis. We are indebted to Raquel Ruiz for her secretarial work and diligence with all her commitments in the studies.

Abbreviations

AE - adverse event

CV - cardiovascular

DAS - disease activity score

RA - rheumatoid arthritis

SMR - standardised mortality ratio

TNF - tumour necrosis factor

Appendix: BIOBADASER and EMECAR Study Groups (in alphabetical order)

Abad MA, Abasolo L, Alegre J, Alegre de Miguel C, Alonso JL, Alonso A, Álvarez A, Álvarez B, Álvaro‐Gracia JM, Amengual O, Andreu JL, Aragón A, Arasa X, Arnal C, Aznar E, Balsa A, Bañegil I, Barastay E, Batlle E, Belmonte MA, Beltrán J, Benito S, Bonilla G, Boquet D, Bosque MT, Buisan A, Cabezas JA, Cáliz R, Calvo J, Calvo I, Campos C, Cantalejo M, Cañete JD, Carbonell J, Carmona L, Carreira P, Carreño L, Casado E, Castro MC, Cebrián L, Centellas M, Chalmeta I, Chamizo E, Ciruelo E, Cobeta JC, Cobo T, Codina O, Collantes E, Coret V, Corrales A, Corteguera M, Crespo M, Cruz A, Cuadra JL, Cuende E, Cuesta E, del Blanco J, Espadaler L, Fernández Campillo J, Fernández Castro M, Fernández Melón J, Fernández Prada M, Ferraz I, Figueroa M, Fiter J, Galindo M, Gallegos A, Gálvez J, García Aparicio A, García Arroba J, García Bernal I, García Borrás JJ, García Consuegra J, García de la Peña P, García de Vicuña R, García Gómez C, García Meijide JA, Gelmán SM, Giménez Úbeda E, Gómez Centeno A, Gómez Vaquero C, Gómez‐Reino JJ, González Álvaro I, González Crespo R, González Fernández MJ, González García T, González Gómez ML, González Hernández T, González Molina R, Granados J, Grandal Y, Graña J, Gratacos J, Gutiérrez R, Hernández B, Hernández FF, Hernández del Rio A, Hidalgo C, Ibáñez J, Ibero I, Idalgo C, Iglesias G, Illera O, Instxaurbe AR, Irigoyen MV, Isasi C, Ivorra J, Jiménez Palop M, Jovani V, Juan A, Judez E, Laffon A, Larrosa M, Lerma JJ, Linares LF, López Martín JA, Loza Cortina E, Loza E, Maiz O, Manero FJ, Marenco JL, Marras C, Marsal S, Martín Domenech R, Martínez A, Martín‐Mola E, Mateo I, Matías MA, Maymo J, Mayordomo L, Mazzucchelli R, Medrano C, Medrano M, Mera A, Merino R, Mínguez M, Montero MD, Montes de Oca JV, Moreno J, Mulero J, Naranjo A, Navarro F, Navarro FJ, Noguera JR, Ortiz AM, Ortiz V, Panadero G, Pantoja L, Pascual E, Pascual C, Paulino FJ, Paulino M, Pecondón A, Peiró E, Pérez García C, Pérez Lidon G, Pérez Sandoval T, Pérez Torres F, Pina MF, Piqueras JA, Pujol M, Pujol J, Quevedo VE, Quiros J, Quirós J, Rejón E, Rivera J, Rodríguez Cros JR, Rodríguez Gómez M, Rodríguez Heredia JM, Rodríguez López M, Rodríguez Lozano C, Rodríguez‐Valverde V, Román J, Ros I, Rosas JC, Roselló R, Rotes I, Rua Figueroa I, Ruiz MT, Saiz E, Sampedro J, Sánchez Andrada S, Sánchez‐Andrade A, Sanmartí R, Santos G, Santos J, Tena X, Tenorio M, Tinture T, Tomero E, Tornero J, Torres C, Torresano M, Tovar JV, Toyos FJ, Trenor P, Tuneu R, Ureña I, Uriarte E, Urruticoechea A, Valdazo JP, Valero M, Valvanera M, Valverde J, Vázquez C, Vela P, Vesga JC, Vidal J, Villaverde V, Zarco P, Zea AC, Zubieta J.

Footnotes

Competing interests: JJGR is on the Advisory Boards of Wyeth and Schering Plough, and has received lectures fees from Abbott, Wyeth, and Schering Plough.

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