RT Journal Article
SR Electronic
T1 Obesity is a strong predictor of worse clinical outcomes and treatment responses in early rheumatoid arthritis: results from the SWEFOT trial
JF RMD Open
JO RMD Open
FD EULAR
SP e000458
DO 10.1136/rmdopen-2017-000458
VO 3
IS 2
A1 Adrian Levitsky
A1 Kerstin Brismar
A1 Ingiäld Hafström
A1 Karen Hambardzumyan
A1 Cecilia Lourdudoss
A1 Ronald F van Vollenhoven
A1 Saedis Saevarsdottir
YR 2017
UL http://rmdopen.bmj.com/content/3/2/e000458.abstract
AB Objectives The aim of this paper was to analyse the impact of obesity, in addition to known predictors, on disease outcome in early rheumatoid arthritis (RA).Methods Body mass index (BMI) was available in 260 patients from the Swedish pharmacotherapy trial (SWEFOT). Differences in disease activity (DAS28), functional impairment (HAQ), pain (Visual Analogue Scale, VAS-pain) and radiographic damage were evaluated over 24 months between BMI categories (obese BMI >30, n=43; overweight BMI=25–29.9, n=74; normal BMI <25, n=143) using non-parametric testing. Predictors of European League Against Rheumatism non-remission (DAS28 ≥2.6) at 24 months of follow-up were evaluated using binary univariate and multivariate logistic regression.Results Obesity at baseline was associated with worse continuous-scale clinical outcomes over 24 months (DAS28, HAQ and VAS-pain at last visit: obese vs normal: p<0.001; obese vs overweight: p<0.05). Furthermore, obese patients compared with non-obese patients had significantly greater odds of non-remission at 24 months (adjusted OR (aOR) 5.2; 95% CI 1.8 to 15.2). Other independent predictors were female sex (aOR 2.6; 95% CI 1.1 to 5.8), current smoking (aOR 2.6; 95% CI 1.1 to 6.3) and HAQ (per-unit increase, aOR 1.9; 95% CI 1.1 to 3.4). The pattern was similar among seropositive and seronegative patients; and in the subgroups of methotrexate responders and patients randomised at 3 months to add-on of sulfasalazine+hydroxychloroquine, although not significant with add-on of infliximab. Obesity had no independent association to radiographic progression.Conclusions In this early RA trial reflecting today’s standard treatment, obesity, in addition to sex, smoking and functional impairment strongly lowered the chance of attaining good clinical outcomes, including remission, today’s treatment goal. This highlights the importance of considering lifestyle modification as one of the cornerstones of RA care.Trial registration number NCT00764725; Post-results. WHO database at the Karolinska University Hospital: CT20080004.