LAUSR

10576 Background: Inflammatory bowel disease (IBD) and use of immunosuppressive therapy in IBD is linked with increased risk of leukemia. We studied the NIS database from 2003-2017 to analyze trends in any type of leukemia in IBD hospitalizations over time and examined the role of age, sex, and race. Methods: We analyzed NIS data of all adult hospitalizations for ulcerative colitis (UC) or Crohn’s disease (CD) with any type of leukemia as a primary or secondary diagnosis using validated ICD 9/10 codes. Age, sex, and racial demographics were collected. Trend analysis of leukemia was performed with Cochran-Armitage and Jonckheere-Terpstra tests. Results: Overall Trends: From 2003-2017, a total of 11,385 of 2,235,413 (0.51%) CD hospitalizations and 8,105 of 1,324,746 (0.61%) UC hospitalizations contained diagnosis of leukemia. An increase in leukemia was seen in both CD and UC group from 0.24% to 0.79% (pTrend < 0.0001) and 0.28% to 0.81% (pTrend < 0.0001) respectively. Sex: In both UC and CD patients, leukemia diagnoses were predominantly male in 2003 but approximated a near 1:1 ratio by 2017 (Table). In CD, the proportion of female (FEM) leukemia diagnoses grew from 31.33% to 45.05% from 2003 to 2017 (pTrend = 0.1898). In UC, the proportion of female leukemia diagnoses grew from 27.49% to 45.79% from 2003 to 2017 (pTrend = 0.0030). Age: Leukemia was more common with increasing age, with no significant changes in proportion of cases between age groups over time (pTrend >.05). Ethnicity: White patients composed 87.80% and 84.24% of leukemia diagnoses in CD and UC, respectively. In CD, an increasing proportion of leukemia diagnoses occurred in black (BK) patients, and a decreasing proportion occurred in white patients (pTrends <.0001; Table 1) during the study time. No trends in race were observed in the UC group (pTrend = 0.4229). Conclusions: Our study showed an increased prevalence of leukemia in CD and UC hospitalizations from 2003-2017 which may be related to increasing use of immunosuppressants such as anti-TNF medications. In both CD and UC, leukemia was male-predominant, but increasingly female by 2017. Rate of leukemia diagnosis increased with age. In the CD group but not the UC group, leukemia was increasingly prevalent in black patients.[Table: see text]