P368 Proactive Therapeutic Drug Monitoring is more effective than Conventional Management in Inducing Fecal Calprotectin remission in Inflammatory Bowel Disease

Pedro, J.(1);Rodrigues, I.(1);Fernandes, S.(1);Gonçalves, A.R.(1);Bernardo, S.(1);Baldaia, C.(1);Valente, A.(1);Moura Santos, P.(1);Correia, L.(1);Tato Marinho, R.(1);

(1)Centro Hospitalar Lisboa Norte, Gastrenterology, Lisboa, Portugal


Proactive therapeutic drug monitoring (pTDM) may potentially improve disease control and treatment outcomes in inflammatory bowel disease.


Using a prospectively maintained database we compared 135 patients following a pTDM protocol aiming at an Infliximab trough level (IFXTL) between 5-10 µg/mL with sequential measurements of Fc, with 108 patients from a retrospective group under conventional management (noTDM). We evaluated the rates of Fc remission (<250 µg/g), and other clinical outcomes at 2-years of follow up.


pTDM associated with higher rates of Fc remission (69.6% vs 50.0%; P=0.002), and steroid-free clinical remission (78.4% vs 55.2%, P=0.028) with a trend for clinical remission (79.3% vs 68.5%, P=0.075). There was no difference in treatment discontinuation (P=0.195), hospitalization (P=0.156), and surgery (P=0.110). Higher IFXTL associated with Fc remission at week 14 (6.59 vs 2.96 µg/mL, P<0.001), and at the end follow-up (8.10 vs 5.03 μg/mL, P=0.001). Fc remission associated with higher rates of clinical remission (85.8% vs 56.8% P<0.001), steroid-free clinical remission (86.9% vs 50.0% P<0.001), and lower rates of IFX discontinuation (8.8% vs 36.8%, P<0.001), and hospitalization (13.5% vs 33.7%, P<0.001) with a non-significant trend for surgery (6.1% vs 12.6%, P=0.101).


PTDM was more effective than conventional management in inducing Fc remission which associated with improved clinical outcomes.