Frequency and Effectiveness of Dose Escalation and De-Escalation of Biologic Therapy in Inflammatory Bowel Disease: The RAINBOW-IBD Study of ENEIDA.

BACKGROUND Real-world data on dose escalation/de-escalation in inflammatory bowel disease (IBD) are scarce. AIMS To assess the frequency, effectiveness and durability of escalation/de-escalation of infliximab, adalimumab, golimumab, vedolizumab and ustekinumab in IBD, and to identify factors influencing relapse and drug discontinuation and re-escalation efficacy. METHODS We included patients from the ENEIDA registry of GETECCU who were exposed to biologics and analysed escalations/de-escalations. We assessed the impact of variables on durability, drug discontinuation and relapse after escalation/de-escalation. RESULTS Of 19,720 patients on biologics, 5096 (26%) underwent dose escalation. Frequency of escalation per patient-year was 5% (infliximab), 7% (adalimumab), 7% (golimumab), 10% (vedolizumab) and 12% (ustekinumab). Clinical remission was recaptured in 32%-49% of patients. Durability of escalation (24 months) ranged from 66% to 88%. Drug discontinuation was associated with previous biologic exposure and disease duration (infliximab), monotherapy (adalimumab) and ulcerative colitis (ustekinumab). There were 669 de-escalations. The frequency per patient-year was 6%, 9%, 5%, 6% and 3% for infliximab, adalimumab, golimumab, vedolizumab and ustekinumab. Maintenance of remission after de-escalation was observed in 75%-100%. Durability of de-escalation (12 months) was 82%-90%. Factors associated with relapse were biologic exposure (infliximab) and age at de-escalation (adalimumab). Re-escalation benefited most patients. CONCLUSIONS In the long term, some patients with IBD need biologic escalation, which frequently recaptures durable clinical remission. De-escalation is feasible in some patients. Re-escalation is generally effective after relapse.