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DOP18 Impact of adherence to anti-tumour necrosis factor therapy on clinical outcomes in Crohn’s disease: A nationwide population-based study

J.J. Park1, H. Koo2, Y. Park1, S.J. Park1, T.I. Kim1, W.H. Kim1, J.H. Cheon1, E.H. Han2

1Severance Hospital, Internal Medicine, Seoul, Korea Republic of, 2Yonsei Institute of Pharmaceutical Sciences, Yonsei University, College of Pharmacy, Incheon, Korea Republic of

Background

The impact of compliance with anti-tumour necrosis factor (TNF) on the clinical outcomes of Crohn’s disease (CD) is not well unknown. We performed a nationwide population-based study to investigate the impact of adherence to anti-TNF therapy on clinical outcomes in CD patients.

Methods

Using the National Health Insurance claims data, we collected data on newly diagnosed patients with CD between 2004 and 2015. Given that infliximab was listed in the National Health Insurance Service in 2006 and adalimumab in 2010, data only after the listing date were extracted. A total of 2784 patients were included according to inclusion criteria. Medication adherence was measured based on the following three criteria, including the ratio of delayed visit, the ratio of the number of visits, and the ratio of actual administration, and was assessed at four-point in time from the initial administration: 14, 22, 39, and 48 weeks.

Results

A total of 2179 patients received infliximab, and 605 patients received adalimumab. The mean cumulative actual to predetermined prescription ratio (CAPPR) at 14 and 48 weeks was 1.07 and 1.17, respectively. CAPPRs of infliximab users were higher than those of adalimumab users (1.06 and 1.21 vs. 1.02 and 1.04 at 14 and 48 weeks, respectively). As hospital visits were delayed one more day, risk of perianal surgery (odds ratio [OR] 1.21, 95% confidence interval [CI] 1.089–1.333), corticosteroid use (OR = 1.008, 95% CI 1–1.016), and hospitalisation (OR = 1.05,95% CI 1.002–1.108) at 48 weeks were significantly increased. Moreover, as CAPPR decreased by 1 percent point, risk of bowel resection (OR = 1.589, 95% CI 0.713–3.542), perianal surgery (OR = 1.246, 95% CI 0.868–1.79), and hospitalisation (OR = 1.128, 95% CI 0.998–1.276) at 14 weeks were significantly increased.

Conclusion

Our data indicate that adherence to anti-TNF therapy affects major clinical outcomes of CD in the short- and mid-term period. Intervention to improving adherence to anti-TNF therapy is highly needed for better clinical outcomes in CD.

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