715 Corticosteroid Sparing Effects of Ustekinumab Therapy in UC Patients: Results From the UNIFI Program

INTRODUCTION: Ustekinumab (UST), an IL12/23 blocker approved for Crohn's disease, was effective in Phase 3 induction and maintenance studies of patients with moderate-severe ulcerative colitis (UC). Since discontinuation of corticosteroids (CS) is an important goal of therapy in UC, this analysis aims to further describe the CS sparing effects of ustekinumab treatment through Week 44 of the UNIFI trial. METHODS: Responders to UST IV induction entered maintenance and were randomized to UST 90 mg SC (q12wks or q8wks), or PBO. During the induction and maintenance studies, oral CS were not to be initiated or increased beyond baseline. At Week 0 of the maintenance study, a scheduled taper was recommended for all patients receiving CS. CS-free Clinical Response (CSR) and remission (CSRem) rates (at Week 44, and for >90 days prior to Week 44) were calculated for the overall population and for the subset of patients on CS at maintenance baseline. Among the subset of patients on CS at maintenance baseline, the mean prednisone-equivalent (P.Eq) CS dose (mg/day) through Week 44 were calculated as were the rates of subjects who were CS-free at Week 44 and for >90 days prior to Week 44. RESULTS: Overall 50.6% (265/523) of patients in the primary analysis population were receiving CS at maintenance baseline. The proportions of patients who were receiving concomitant CS at maintenance baseline were 52.3%, 47.7%, and 52.3% in the UST q8w, UST q12w and PBO groups, respectively. As detailed in Table 1, in the overall population, CSR and CSRem rates were significantly higher for patients who continued on UST therapy during maintenance compared with placebo. Among the patients who achieved CSR or CSRem at Week 44, the majority achieved these endpoints and eliminated CS use at or up to 90 days prior to Week 44. Similar results were observed in the subset of patients on concomitant CS at maintenance BL. In this group, the mean daily P.Eq CS dose at maintenance BL was approximately 15.0 mg/day for all treatment groups. Mean decrease in average daily P.Eq dose at Wk 44 was more pronounced and the proportion of patients who were CS-free was greater in the UST maintenance arms. CONCLUSION: UST maintenance therapy, with both q8w and q12w dosing regimens, is effective in reducing and eliminating the use of CS in patients with UC; the majority of patients (>90%) who achieved clinical response or clinical remission were able to eliminate corticosteroids.

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