Incidence and risk factors for lymphoma in a single-center inflammatory bowel disease population.
OBJECTIVE
Previous studies on the risk of lymphoma in inflammatory bowel disease (IBD) have yielded conflicting results. We aim to determine the incidence and risk factors for lymphoma in a large IBD population.


METHODS
Patients with lymphoma were identified from a single-center IBD database. The standardized incidence ratio (SIR) of lymphoma was estimated using data from the Surveillance, Epidemiology and End Results (SEER) registry. Risk factors for lymphoma were determined by comparing cases with a matched IBD control group.


RESULTS
Eleven lymphomas were identified among 3,585 IBD patients during an average of 8.4 years of observation. Three patients were excluded. In the remaining eight, median age at diagnosis was 47 years and mean IBD duration was 20 years (range 7.5-45 years). The SIR for lymphoma was 1.6 [95% confidence interval (CI) 0.6-3.0], and for non-Hodgkin lymphoma (NHL), 1.5 (0.3-2.8). Three lymphoma patients (38%) received prior immunomodulators and two (25%) received biologics, versus 57% and 39% in the control group, respectively (P = 0.4). No correlation was seen with tobacco exposure, disease duration, use, or dose or duration of immunosuppressive therapy.


CONCLUSIONS
In this IBD cohort, risk of lymphoma was not increased compared with the general population. Risk of lymphoma was not associated with any demographic or therapy-related factors.
Chiorean
Michael V
MV
Division of Gastroenterology and Hepatology, Department of Medicine, Indiana University School of Medicine, 550 N University Blvd., UH 4100, Indianapolis, IN, USA. mchiorea@iupui.edu
Pokhrel
Bhupesh
B
Adabala
Jaya
J
Helper
Debra J
DJ
Johnson
Cynthia S
CS
Juliar
Beth
B
D000328:Adult; D000368:Aged; D000893:Anti-Inflammatory Agents / Q000009:adverse effects / Q000627:therapeutic use; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007166:Immunosuppressive Agents / Q000009:adverse effects / Q000627:therapeutic use; D015994:Incidence; D007196:Indiana / Q000453:epidemiology; D015212:Inflammatory Bowel Diseases / Q000150:complications* / Q000453:epidemiology; D008223:Lymphoma / Q000453:epidemiology / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors
D000893:Anti-Inflammatory Agents; D007166:Immunosuppressive Agents