Association of paediatric autoimmune cytopenia and inflammatory bowel disease suggests a common genetic origin

Area of Science:

• Pediatric Hematology
• Pediatric Gastroenterology
• Autoimmune Disorders

Background:

• The co-occurrence of autoimmune cytopenia (AIC) and inflammatory bowel disease (IBD) is recognized but not well-quantified in pediatric populations.
• The incidence and specific risk factors for IBD in children with AIC remain largely unknown.

Purpose of the Study:

• To determine the incidence of IBD in children with AIC.
• To identify risk factors for IBD development in this cohort.
• To explore the role of genetic variants in AIC-IBD association.

Main Methods:

• Prospective cohort study (OBS'CEREVANCE) including 1609 children with chronic immune thrombocytopenic purpura, autoimmune hemolytic anemia, or Evans syndrome.
• Longitudinal follow-up to diagnose incident IBD.
• Genetic testing for germline variants in a subset of patients.

Main Results:

• Fifteen children were diagnosed with IBD, with 14 developing it after AIC diagnosis (median delay: 21 months).
• Age over 10 years at AIC diagnosis was the sole identified risk factor for IBD.
• Germline variants associated with autoimmune disorders (CTLA4, DOCK11) were found in 3 of 10 genetically tested children.

Conclusions:

• Pediatric patients with AIC, particularly those over 10 years old, require vigilant monitoring for gastrointestinal symptoms suggestive of IBD.
• Prompt gastrointestinal work-up and genetic studies are recommended for children with AIC presenting with relevant symptoms.
• Identifying causal germline variants may enable targeted therapeutic strategies.