REAL-WORLD EXPERIENCE FOR BIOLOGIC USE IN IBD IN THAI: A SINGLE-CENTER EXPERIENCE

Abstract

Abstract BACKGROUND Biologics have been used for the treatment of inflammatory bowel disease (IBD) worldwide; however, their use is still limited in Southeast Asia. This study aimed to describe the pattern of biologic use and outcomes in a tertiary referral center in Thailand. METHOD All patients with IBD who used biologics from the first case in 2012 to present in our center were enrolled. The data were prospectively collected since 2017; the data of patients before 2017 were retrospectively reviewed. The treatment outcomes comprised cumulative clinical, endoscopic, radiologic response or remission, and quality of life assessed by SIBDQ. Furthermore, the biologic persistence was reported. RESULTS Of 296 cases currently in the IBD clinic, 85 used biologics, including infliximab (IFX), vedolizumab (VDZ), and ustekinumab (UST). The mean age was 44.4 years, and 62% were male. Fifty-eight (68.2%) had Crohn’s disease (CD) and 27 (31.8%) had ulcerative colitis (UC). In CD, 58% had ileocolonic disease, 48% had bowel stricture, 29% had fistula, and 19% had perianal diseases. In UC, 19% had left-sided colitis, and 81% had extensive colitis. Most patients (97%) failed conventional treatment. In CD, 60%, 31%, and 8.6% use IFX, VDZ, and UST as the first biologic, respectively. While 81.5% of UC used VDZ and 18.5% used IFX. Concomitant immunomodulator was used in 77.6%. The median duration of the first biologic use was 12.6 months. The outcomes of the treatment were shown in Table 1. The overall cumulative clinical response and remission at 1 year were 94% and 63%, respectively, without significant differences among each biologic. The cumulative rate of endoscopic remission was 29%, 64%, and 82% at 1, 3, and 5 years, respectively, also without significant differences among each biologic (p=0.21). However, subgroup analysis in Crohn’s disease showed a trend of a better endoscopic remission rate for IFX and UST when compared to VDZ (p=0.15). The radiologic remission rate was only 12% of 25 patients who underwent CT enterography. The SIBDQ increased from 52.0 to 57.4 after 1 year of treatment. Thirty-six (42%) stopped the medicine. As shown in Figure 1, the overall cumulative rate of biologic discontinuation was 19% and 39% in the first and second year, respectively, without significant differences among biologics. However, the reason for drug discontinuation was different as all adverse events occurred in only patients using IFX. CONCLUSION Biologics were mostly used in refractory patients in this cohort. The outcomes were comparable to those previously reported in western. Current biologics could significantly improve patients’ symptoms, quality of life, and mucosal healing, but not transmural healing. The adverse events were less in newer biologics.