Abstract
Background
Little is known about the natural history of perianal fistulas in Asian populations with Crohn’s disease (CD).
Aims
We investigated the incidence and outcomes of perianal CD (pCD) in Korean CD patients.
Methods
A nationwide population-based cohort of 6265 CD patients diagnosed in 2010–2014 was analyzed to investigate the incidence and outcomes of pCD. The results were validated in a hospital-based cohort of 2923 CD patients diagnosed in 1981–2015. Factors associated with pCD development were analyzed. The incidence and outcomes of pCD were compared between the prebiologic and biologic eras.
Results
pCD occurred in 39.2% of the population-based cohort and 56.1% of the hospital-based cohort during the median follow-up of 4.2 and 8.5 years, respectively. The cumulative incidence of pCD was 40.0% at 5 years after CD diagnosis in the population-based cohort and 62.5% at 20 years in the hospital-based cohort. In multivariate analysis, pCD development was positively associated with male sex, younger age and colonic involvement at diagnosis, early diagnosis, and CD diagnosis in the prebiologic era. The cumulative probability of proctectomy at 10, 20, and 30 years after pCD diagnosis was 2.9%, 12.2%, and 16.2%, respectively. The cumulative incidence of pCD occurring after CD diagnosis and the cumulative probability of proctectomy were significantly lower in the biologic era than in the prebiologic era (p < 0.001 and p = 0.03, respectively).
Conclusions
Compared with Western patients with CD, Korean patients show a high incidence of pCD but have a low probability of proctectomy, suggesting the favorable course of pCD.
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Acknowledgments
We thank the Korean Health Insurance Review and Assessment Service and the National Health Insurance Service for providing the insurance claims data.
Funding
This work was supported by a Korean Health Technology R&D Project Grant from the Korea Health Industry Development Institute to Suk-Kyun Yang (A120176), funded by the Ministry of Health and Welfare. Ho-Su Lee was supported by the National Research Foundation of Korea (NRF) MRC Grant funded by the Korean government (MSIT) (2018R1A5A2020732).
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EMS, HSL, and SKY were involved in planning and conducting the study. EMS, HSL, YJK, EHO, NSH, JK, SWH, SHP, DHY, BDY, JSB, SJM, YSY, CSY, and SKY contributed to collecting data. EMS, HSL, YJK, and SKY helped in statistical analysis and interpretation of data. EMS and HSL contributed to drafting the manuscript. SKY was involved in study supervision and critical revision of the manuscript for important intellectual content.
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Suk-Kyun Yang received a research grant from Janssen Korea Ltd.; however, this funding was not related to the topic of this study. The remaining authors have no conflict of interest or financial ties to declare.
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Song, E.M., Lee, HS., Kim, YJ. et al. Incidence and Outcomes of Perianal Disease in an Asian Population with Crohn’s Disease: A Nationwide Population-Based Study. Dig Dis Sci 65, 1189–1196 (2020). https://doi.org/10.1007/s10620-019-05819-9
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DOI: https://doi.org/10.1007/s10620-019-05819-9