THU0234 Bmi does not affect clinical outcome in psoriatic arthritis patients treated with tight control strategy

Background Psoriatic arthritis(PsA)is characterised by several comorbidities;among these obesity and overweight have a major impact on patients’ quality of life and on disease treatment. Obesity increases the risk of developing psoriatic arthritis in the general population compared to normal-weight subjects. Obesity increases the risk of developing arthritis in patients with psoriasis, especially for HLA B27 negative and late onset forms. Objectives Aim of the study was to evaluate the incidence of overweight and obesity in a cohort of PsA patients, the differences between disease phenotypes and therapeutic response between patients with normal weight and overweight/obesity. Methods In this retrospective observational study 332 PsA patients, afferent to our unit between 2010 and 2017, were assessed. At each visit data on disease characteristics, BMI, ongoing treatment, joint count and clinimetric indexes were collected. The baseline was defined as the onset of the disease in bio-naive patients or the start of the last bDMARD therapy for patients previously treated with cs or bDMARDS, while the last follow-up is considered the last visit at our unit Results The 332 patients had a mean age of 52.5±7.3 years;35% of the patients were normal weight, 39.5% were overweight and 25.5% obese. No differences were observed in terms of disease characteristics according to BMI cathegory at baseline and during follow-up, with comparable percentages of peripheral arthritis, enthesitis, dactylitis, axial arthritis or uveitis, as well as cutaneous psoriasis among the groups. At baseline, obese patients had more tender(4.4±5.2 vs 2.3±3.6 p=0.003)and swollen joints(mean value 2.3 vs 1 p=0.03)and higher activity indexes, as for DAS28(3.3±1.2 vs 2.7±1.2 p=0.002)and DAPSA(15.6±9.9 vs 11.5±9 p=0.004)compared to normal weight patients. The same difference was observed between normal-weight and overweight patients, with higher values of DAS28(3.04±1,4 vs 2,7±1.2,p=0.17)and DAPSA(13.6±11 vs 11.5±9, p=0.025)in overweight patients. No significant difference was observed in patients treated with NSAIDs, csDMARDs or bDMARDs according to BMI cathegory. In 190 patients followed according to the tight control strategy, with evaluations every 3 months, the disease activity indexes after two years of follow-up became similar in obese patients compared to normal weight patients. Among the normal-weight patients, 69.4% took csDMARDs,48.7% were treated with bDMARDs. 74.7% of obese patients took csDMARDs, while 36.1% took bDMARDs, with no statistically significant differences between the two groups(p=ns). In particular low-disease activity according to DAPSA was achieved in 76% of normal weight patients, compared with 68.9% of obese patients (p=ns), and also the percentage of patients reaching Minimal Disease Activity in the two groups was comparable (28.4% vs 22.7%, p=ns). Conclusions Clinical manifestations of psoriatic disease do not seem to differ according to BMI cathegory:however, at the first evaluation, obese patients appear to have more disease activity than non-obese patients. At the same treatment intensity, obese patients seem to achieve a percentage of remission comparable to normal weight patients, suggesting that the an intensive treatment strategy allows to obtain optimal results also in a more challenging group of patients. Disclosure of Interest None declared