Objective
To evaluate gastrointestinal perforation (GIP) in rheumatoid arthritis (RA) patients receiving tofacitinib, tocilizumab or other biologics.
Methods
Using health plan data from 2006–2014, RA patients without prior GIP were identified. Those initiating tofacitinib or biologics were followed for incident GIP within hospitalization. Crude incidence rates were calculated by exposure. Adjusted Cox proportional hazards models evaluated the association between GIP and exposures.
Results
A cohort of 167,109 RA patients was analyzed. Among them, 4,755 initiated tofacitinib, 11,705 tocilizumab, 115,044 anti-tumor necrosis factor (TNFi), 31,214 abatacept, and 4,391 rituximab. Versus TNFi recipients, abatacept recipients were older, tofacitinib and rituximab were younger, and tocilizumab recipients were similar. All non-TNFi patients were more likely to have previously received biologics than the TNFi patients. Incidence of GIP per 1,000 person-years was 1.29 (tofacitinib), 1.55 (tocilizumab), 1.10 (abatacept), 0.73 (rituximab), and 0.84 (TNFi). Most perforations occurred in the lower GI. Incidence of lower tract GIP was 1.29 (tofacitinib), 1.26 (tocilizumab), 0.76 (abatacept), 0.73 (rituximab), and 0.46 (TNFi). Lower tract GIP risk was significantly elevated for both tocilizumab and tofacitinib patients versus TNFi. Adjusted hazard ratios (HRs) were 2.55, 95%CI 1.33–4.88 for tocilizumab, and 3.24, 95%CI 1.05–10.04 for tofacitinib. Older age (HRs=1.16 per 5 years, 95%CI 1.10–1.22), diverticulitis/other gastrointestinal conditions (HR=3.25, 95%CI 1.62–6.51), and prednisone use>7.5mg/day (HR=2.24, 95%CI1.36–3.70) were predictors of lower-tract GIP. Incidence of upper-tract GIP was similar among all drug exposures.
Conclusion
We estimated that the risk for lower-tract gastrointestinal perforation associated with tocilizumab and tofacitinib was more than double that for TNFi.