P479 The prevalence and risk factors of hematologic malignancy in patients with intestinal Behçet’s disease

Background The association of intestinal Behçet’s disease (BD) with the risk of hematologic malignancy is still unclear. We aimed to assess the prevalence and determine risk factors of hematologic malignancy in intestinal BD. Methods Using a cohort of patients with intestinal BD between 1997 and 2021, the prevalence and risk factors of hematologic malignancy were analysed by logistic regression analysis at inflammatory bowel disease centre of Severance Hospital, Seoul, Korea. Results Among 780 intestinal BD patients, 23 patients developed hematologic malignancy. Myelodysplastic syndrome (MDS) (n=12) was the most common hematologic malignancy, followed by aplastic anemia (AA) (n=7), leukemia (n=2), and lymphoma (n=2). Eight patients had developed hematologic malignancy before their intestinal BD diagnosis and 15 patients developed hematologic malignancy after their intestinal BD diagnosis. Of the 772 patients without previous hematologic malignancy, patients smoking history (p-value 0.019, odds ratio [OR] 49.513, 95% confidence interval [CI] 1.925-1273.4), history of at least one emergency room (ER) visit (p-value 0.025, OR 26.360, CI 1.501-462.92), and albumin lower than 3.3g/dL (p-value 0.046, OR 603.013, CI 0.108-328191.23) at diagnosis were positively associated with subsequent hematologic malignancy. Body mass index (BMI) (p-value 0.030, OR 0.569, CI 0.342-0.947) was negatively associated with hematologic malignancy. Conclusion The physicians who care for intestinal BD patients with risk factors should be aware and provide careful monitoring of the elevated risk of hematologic malignancy.