Abstract Background Chronic refractory pouchitis (RP) is a complication of ileal pouch-anal anastomosis (IPAA). Vedolizumab (VDZ) has been used in RP management, but real-world data on its effectiveness are limited. Additionally, information on switching from intravenous (IV) to subcutaneous (SC) VDZ in this context is scarce. Aims To evaluate the efficacy and safety of VDZ in RP treatment in a real-world clinical setting, to assess outcomes following a transition from IV to SC VDZ, and to compare treatment persistence and safety between IV and SC administration. Methods A multicenter Spanish study was conducted in patients with RP receiving VDZ for active pouchitis. Clinical outcomes were evaluated using the modified Pouch Disease Activity Index (mPDAI), and biomarkers such as faecal calprotectin (FC), C-reactive protein (CRP), and VDZ serum levels were monitored over one year. Patients who transitioned from IV to SC VDZ were assessed post-switch. Results A total of 47 patients were included (31 (66%) male; median age 51 [43, 64] years). Of these, 25 (53%) switched from IV to SC administration. Baseline characteristics are shown in Figure 1. Significant reductions in mPDAI scores were observed with IV VDZ, from 5 (3-7) at baseline to 3 (2-5), 3 (2-5), (2-5.8) at weeks (W) 12, 24 and 52 respectively (p<0.05). FC decreased significantly over time, from 443 µg/g (213, 746) to 329 µg/g (145-701), 193 µg/g (91-412) and 178 µg/g (101-640) at W12, 24 and 52, respectively (p<0.05), although no significant changes were observed in CRP levels. VDZ serum levels were 16,9 μg/dl (10.3-25.7), 12 μg/dl (7.3-23), 9 μg/dl (6.7-13.9) at W12, 24 and 52 respectively. After switching from IV to SC VDZ, there were no significant differences in terms of mPDAI, FC and CRP at W12 and W24. However, a significant decrease in mPAI (p=0.04) and FC levels (p=0.038) was observed at W52. FC levels also dropped significantly from 550 µg/g (145-1163) pre-swich to 264 µg/g (52-989), 129 (101-448) and 62 (31-211) at W12, 24 and 52, respectively. Notably, SC VDZ serum levels increased significantly, from 8.5 μg/dl (7.2-14) at time of switch to 22.7 μg/dl (21-27.3), 19.6 μg/dl (16.5-21), 21.6 μg/dl (17-26.2) over time. Fewer prior advanced therapies correlated with better outcomes, whereas use of corticosteroids and immunosuppressants at baseline did not. VDZ persistence was high (Figure 2) and adverse event rates were similar for IV and SC VDZ (8.5% and 12%, respectively). Conclusion VDZ was effective in achieving clinical and biological remission in patients with RP following IPAA for ulcerative colitis, particularly with early intervention. Switching from IV to SC VDZ effectively sustained long-term remission, demonstrating safety and persistence in routine clinical practice.
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