O10 Combining clinical and ultrasound assessment to taper biologic therapies in patients with RA in routine clinical practice

Background There is growing evidence for tapering biologic therapies in patients with rheumatoid arthritis in sustained clinical remission to avoid overtreatment and minimise side-effects. Ultrasound assessment for subclinical synovitis adds to clinical assessment of patients with rheumatoid arthritis suitable for tapering biologic therapies. Our primary objective was to combine clinical and ultrasound assessment to select patients with rheumatoid arthritis for tapering biologic therapies in routine clinical practice. The secondary objectives were to identify predictors for successful tapering and assess the cost savings to the local health economy by optimising the use of high cost drugs. Methods All patients with rheumatoid arthritis on a biologic therapy for 2 years and in sustained clinical remission (DAS28≤2.6) over the previous year were seen in the remission clinic. They had an Ultrasound scan of the small joints of the hands, wrists and other symptomatic joints. Patients with no activity on Power Doppler were advised to lengthen the interval of their biologic therapy gradually and were followed once every 3 months. Patients were not on oral steroids but continued conventional DMARDs. Patients had a dedicated helpline if they had a flare. Results Ninety-three of the 120 patients with rheumatoid arthritis on biologic therapy seen in the biologic remission clinic between January and October 2019 were eligible and all but one agreed to taper. They were 70% female with a mean age of 62.8 years and mean duration of disease 14.6 years. Their mean duration of biologic therapy was 6.3 years; mean baseline DAS28 was 6.3 pre-biologic therapy and 1.7 before tapering. Fifty-seven of the patients were on a TNF inhibitor and 35 were on other biologic therapies. Forty of the ninety-two patients were co-prescribed DMARDs. Screening failure was due to clinical activity in 13 patients, Ultrasound Power Doppler activity in 23 patients, interstitial lung disease in 2 patients and shoulder surgery in one. Only two of the 40 patients who had completed 6 months had a flare and reverted to the baseline frequency. Of the remaining 52 patients, 22 patients had completed 3 months at the tapered dose and 3 patients who were in the initial 3 months had a flare and reverted to the baseline frequency. Initial drug-cost savings at 6 months was approximately £45,000. Conclusion Tapering of biologic therapies in patients with rheumatoid arthritis is feasible in routine clinical practice. Ultrasound is helpful to stratify patients for biologic tapering and has enabled a higher proportion of patients to remain in remission after tapering. Disclosures H. Pillai: None. N. Nolkha: None. A. Yau: None. S. Matthews: None. A. Hall: None. G. Hirsch: None. S. Venkatachalam: None.