Histologic Outcomes With Vedolizumab Versus Adalimumab in Ulcerative Colitis: Results From An Efficacy and Safety Study of Vedolizumab Intravenous Compared to Adalimumab Subcutaneous in Participants With Ulcerative Colitis (VARSITY)

BACKGROUND AND AIMS: VARSITY (An Efficacy and Safety Study of Vedolizumab Intravenous IV Compared to Adalimumab Subcutaneous SC in Participants With Ulcerative Colitis) showed superior clinical remission and endoscopic improvement in ulcerative colitis with vedolizumab vs adalimumab. This analysis compared histologic outcomes. METHODS: Patients in VARSITY were randomized 1: 1 to maintenance with vedolizumab IV 300 mg every 8 weeks or adalimumab SC 40 mg every 2 weeks (both following standard induction). Geboes Index and Robarts Histopathology Index (RHI) scores were used to assess prespecified histologic exploratory end points of histologic remission (Geboes <2 or RHI ≤2) and minimal histologic disease activity (Geboes ≤3. 1 or RHI ≤4) at weeks 14 and 52. RESULTS: In total, 769 patients received vedolizumab (n = 383) or adalimumab (n = 386). Mean baseline histologic disease activity was similar between vedolizumab and adalimumab groups. Vedolizumab induced greater histologic remission than adalimumab at week 14 (Geboes: 16. 7% vs 7. 3%, Δ9. 4% 95% confidence interval CI, 4. 9%-13. 9%, P <. 0001; RHI: 25. 6% vs 16. 1%, Δ9. 5% 95% CI, 3. 8%-15. 2%, P =. 0011) and week 52 (Geboes: 29. 2% vs 8. 3%, Δ20. 9% 95% CI, 15. 6%-26. 2%, P <. 0001; RHI: 37. 6% vs 19. 9%, Δ17. 6% 95% CI, 11. 3%-23. 8%, P <. 0001) overall and in both anti-tumor necrosis factor (TNF) -naïve and -failure subgroups. Results were similar for minimal histologic disease activity. Histologic outcomes were generally better in anti-TNF-naïve vs -failure patients. At week 52, rates of mucosal healing (composite end point of histologic plus endoscopic improvement) were also higher with vedolizumab than adalimumab (Geboes: 25. 6% vs 6. 7%; RHI: 30. 5% vs 14. 5%). CONCLUSIONS: Higher rates of histologic remission, minimal histologic disease activity, and combined histologic plus endoscopic outcomes were observed with vedolizumab than with adalimumab in ulcerative colitis in both anti-TNF-naïve and -failure subgroups. REGISTRATION: ClinicalTrials. gov NCT02497469; EudraCT 2015-000939-33.