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  • Title: Superior Efficacy of Infliximab Versus Adalimumab for First-Line Treatment of Crohn's Perianal Fistulae.
    Author: Maas L, Gao R, Cusumano V, Spartz E, Chowdhury R, Krishna M, Lazarev M, Melia J, Selaru F, Sharma S, Limketkai B, Parian A.
    Journal: Dig Dis Sci; 2023 Oct; 68(10):3994-4000. PubMed ID: 37540392.
    Abstract:
    BACKGROUND: Crohn's disease perianal fistulae (CD-PAF) occur in 25% of patients and are notoriously challenging to manage. Tumor necrosis factor inhibitors are first line agents. AIMS: The aim of this study was to compare infliximab (IFX) versus adalimumab (ADA) efficacy in CD-PAF healing over time. METHODS: A retrospective study at two large-tertiary medical centers was performed. Inclusion criteria were actively draining CD-PAF and initial treatment with IFX or ADA following CD-PAF diagnosis. The primary endpoints were perianal fistula response and remission at 6 and 12 months. Secondary endpoints included biologic persistence over time and dose escalation at 6 and 12 months. RESULTS: Among 151 patients included in the study, 92 received IFX and 59 received ADA as first line agents after CD-PAF diagnosis. At 6 months, the 64.9% of the IFX group and 34.8% of the ADA group demonstrated CD-PAF clinical improvement (p < 0.01). Univariate and multivariate analyses demonstrated significant differences among the IFX and ADA groups for clinical response at 6-months and 12-months (p = 0.002 and p = 0.042, respectively). There were no factors that predicted response, with the exception of concomitant immunomodulator affecting the 6-month clinical response (p = 0.021). Biologic persistence, characterized by Kaplan Meier methods, was significantly longer in the IFX group compared to the ADA group (Log-rank p = 0.01). CONCLUSION: IFX induction and maintenance is associated with higher rates of response and remission in CD-PAF healing as well as higher treatment persistence compared to ADA. Additionally, our study supports the use of concomitant immunomodulator therapy for CD-PAF healing and remission.
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