IMPROVEMENT IN GROWTH AND NUTRITION STATUS AFTER ANTI-TNF THERAPY INITIATION AMONG PATIENTS WITH PEDIATRIC CROHN’S DISEASE: RESULTS FROM THE COMBINE TRIAL
Authors: Plott Natalia , Steiner Steven , Firestine Ann , Galanko Joseph , Kappelman Michael 
Published: January 2024

Abstract

BACKGROUND
Growth failure impacts 15-40% of children with Crohn’s disease (CD). Potential causes of growth failure include chronic inflammation, malabsorption, and poor nutritional intake. Control of inflammation is key to improving growth outcomes. Anti-TNF therapy has been associated with improved growth and nutritional status in affected children. Large studies of serial outcomes of growth after anti-TNF therapy initiation are limited.

OBJECTIVE
We sought to 1) describe baseline weight, height, and BMI status at anti-TNF initiation in children with CD in a large, multicenter clinical trial, 2) compare the demographic and clinical characteristics of children with and without weight, height, and BMI disturbance, and 3) describe follow-up anthropometric parameters at approximately 12 and 24 months after anti-TNF initiation.

METHODS
We analyzed data from the COMBINE trial, a multicenter study comparing infliximab or adalimumab in combination with oral methotrexate to anti-TNF monotherapy for children with CD. We obtained demographic, clinical, and anthropometric data at time of enrollment and after 12 and 24 months. Weight, height, and BMI Z-scores were dichotomized as normal (≥ -1) versus disturbance (&lt; -1) at each time point. We used standard descriptive statistics to summarize the distribution of Z-scores and bivariate statistics to compare demographic, clinical, and treatment characteristics among participants with versus without growth disturbance at baseline.

RESULTS
Our study population included 199 children (25% female, 83% white, mean age 12 years). Of these, 53 (26.6%) had a weight disturbance at baseline (Table 1). Of 188 children with height data available at baseline, 52 (27.7%) had a height disturbance and 37 (19.7%) had a BMI disturbance. The mean short pediatric CD activity index (sPCDAI) was higher in those defined with weight, height, and BMI disturbance at baseline compared to those with normal parameters (Table 2). Gender, race, ethnicity, and age at time of anti-TNF initiation were not different between groups with and without weight, height, or BMI disturbances. Approximately 12 months after enrollment, the proportion of patients with height disturbance was 6.1% with a continued decrease to 0.9% at 24 months. BMI disturbance was observed in 7.5% of participants at 12 months and 2.8% at 24 months. Weight disturbance was observed among 5.7% and 0.8% of participants at 12 and 24 months respectively.

DISCUSSION
A substantial proportion of children with CD had weight, height, and BMI disturbance at time of anti-TNF initiation. These proportions decreased at approximately 12 months and 24 months, demonstrating significant improvement in growth disturbances after anti-TNF therapy.

Table 1 % of children with weight, height, and BMI disturbance (Z-score &lt;-1) at time of enrollment in addition to 12 and 24 months after anti-TNF therapy initiation.

Table 2 Mean short pediatric Crohn’s disease activity index (sPCDAI) for BMI, weight, and height at time of anti-TNF initiation.