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New Targets in Inflammatory Bowel Disease Therapy: 2021

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New Targets in Inflammatory Bowel Disease Therapy: 2021 REVIEW CURRENT OPINION New targets in inflammatory bowel disease therapy: 2021 Nathaniel A. Cohen and David T. Rubin Purpose of review In the rapidly progressing world of inflammatory bowel disease, this review discusses and summarizes new drug targets and results from major clinical trials in order to provide an update to physicians treating patients with inflammatory bowel diseases (IBD). Recent findings Multiple new mechanisms in the treatment of IBD are being developed and many are showing promising results in both ulcerative colitis and Crohn’s disease patients. In addition to efficacy, some of these treatments may provide safety benefits over existing therapies. Summary The IBD physicians’ therapeutic armamentarium is rapidly expanding and keeping abreast of these developments is required in order to provide patients with optimized individualized care. Keywords biologics, inflammatory bowel disease, new therapeutics, small molecules INTRODUCTION physician’s armamentarium, a significant percentage The inflammatory bowel diseases (IBD) are a hetero- of patients do not respond to these treatments [10]. geneous group of conditions divided into two As such, new treatment pathways and a greater predominant groups, Crohn’s disease (CD) and ulcer- understanding of mechanisms of treatment failure ative colitis (UC). These conditions are characterized are required. This will provide more options for by a chronic, progressive, or relapsing and remitting patients and greater individualization in treatment disease course with the gastrointestinal (GI) tract decision-making. being the major site of inflammatory activity. This review examines the future of IBD treat- Unchecked, this inflammation can result in a ments and details current phase I, II, and III clinical complicated disease course with undesirable ramifi- trial results. Figure 1 and Table 1 show therapies at cations such as abdominal abscesses, fistulae, their varying stages of clinical development. strictures, and subsequent bowel obstruction, and increase the risk for GI malignancy. These diseases ANTI-TRAFFICKING THERAPIES have a significant impact on patient quality of life, activities of daily living and increase healthcare costs Antiadhesion molecules [1,2]. The mainstay of treatment of IBD is immune- An important part of T-cell-dependent chronic suppressive and immune-modulating agents. The intestinal inflammation in IBD is the homing of biologic treatment era starting with the antitumor T-lymphocytes to the gut. Antiadhesion agents necrosis factors (TNF) therapies has heralded signifi- cant changes in our ability to obtain and maintain The University of Chicago Medicine Inflammatory Bowel Disease Center, clinical response and remission in a safer manner Chicago, Illinois, USA [3–5]. Further advances have resulted in the develop- Correspondence to David T. Rubin, MD, The University of Chicago ment of gut selective biologic agents, the antiinte- Medicine Inflammatory Bowel Disease Center, Chicago, Illinois, USA. grins [6,7], targets of different biochemical pathways Tel: +1 773 702 2950; fax: +1 773 702 2182; such as with ustekinumab [8], and the oral small e-mail: [email protected] molecule therapy, tofacitinib [9]. Although these Curr Opin Gastroenterol 2021, 37:357–363 treatments have certainly broadened the IBD DOI:10.1097/MOG.0000000000000740 0267-1379 Copyright ß 2021 Wolters Kluwer Health, Inc. All rights reserved. www.co-gastroenterology.com Copyright © 2021 Wolters Kluwer Health, Inc. All rights reserved. Inflammatory bowel disease target integrins responsible for homing and reduce KEY POINTS the inflammatory cell infiltrate [11]. The anti There are multiple new biologic and small molecule a4b7 integrin antibody vedolizumab is currently therapies in advanced stages of development. approved and widely used in the treatment of both UC and CD [6,7]. These will provide physicians with a great number of The next generation in this treatment class is effective and safe options for patients requiring etrolizumab, a humanized IgG1 monoclonal anti- biologic therapy. body that selectively binds the b7 subunit and thus The multitude of mechanisms of action will allow for blocks both the a4b7 and the aeb7 intestinal integ- greater personalization of therapy and allow rins. The etrolizumab phase 3 clinical program is the physicians and patients to balance their choice based largest and most comprehensive in IBD and is on efficacy, safety, and mode of administration. among the first to include head-to-head trials in These new mechanisms increase the insight into the UC against an anti-TNF agent. HIBISCUS I and II pathophysiology of IBD and will promote the evaluated the efficacy of etrolizumab for induction development of an even greater array of drugs in head-to-head against adalimumab and placebo in the future. anti-TNF naı¨ve UC patients. This study included 716 There remains a ‘therapeutic ceiling’ that will only be patients. In the pooled analysis, clinical remission at exceeded with novel combination approaches or week 10 was 18.8% for etrolizumab vs 23.5% for nonimmune-based strategies that change the adalimumab (P ¼ 0.13). Etrolizumab was well-toler- current paradigms. ated with most adverse events being nonserious or grades 1 or 2. The primary outcome was not met and FIGURE 1. Clinical trial pipeline of IBD therapies. Outer ring: Phase 1, Middle ring: Phase 2, Inner circle: Phase 3. IBD, inflammatory bowel diseases. 358 www.co-gastroenterology.com Volume 37 Number 4 July 2021 Copyright © 2021 Wolters Kluwer Health, Inc. All rights reserved. New targets in inflammatory bowel disease therapy Cohen and Rubin Table 1. Clinical development of drugs with novel therapeutic targets in IBD Current phase Category and name Mechanism of action Results published of development Indication Ref Antitrafficking therapies Antiintegrins AJM300 Oral, novel, small Phase 2a study, significantly greater 3 UC [22,24] molecule a4 integrin clinical and endoscopic remission inhibitor rates compared with placebo Sphingosine 1 phosphate receptor modulator LC51-0255 S1P receptor modulator Phase 1 2 UC þ CD [57] OPL-002 S1P receptor modulator Phase 1 2 UC þ CD [58] Antiinterleukin antibodies Spesolimab Anti-IL36 Phase 1 2 UC þ CD [59] PF-04236921 Anti-IL6 Phase 2 study showed significantly CD [60] greater week 12 clinical remission compared with placebo with durability during the OLE JAK and tyrosine kinase inhibitors TD-1473 Oral novel, gut Phase 1 2 UC þ CD [61] selective, pan JAK inhibitor BMS-986165 TYK-2 inhibitor Phase 1 2 UC þ CD [62] Toll-like receptor agonists Cobitolimod TLR-9 agonist Phase 2 study showed significantly 2 UC [63] (DIMS0150) higher rates of symptomatic improvement at weeks 4 and 8 with significantly more patients having clinical remission and mucosal healing at week 4, compared with placebo Interleukin 10 – fusion biologic AMT-101 Novel oral human IL-10 Phase 1 2 UC [64&] fusion protein CD, Crohn’s disease; IBD, inflammatory bowel diseases; JAK, Janus kinase; OLE, open label extension; S1P, shingosine-1 phosphate; UC, ulcerative colitis. etrolizumab was not superior to adalimumab at profile the drugs was comparable [14&]. Although week 10. However, there was a statistically signifi- etrolizumab was not superior to adalimumab or cant increase in endoscopic remission rates com- infliximab the rates of clinical and endoscopic out- pared with placebo [12&]. The LAUREL induction comes were similar and etrolizumab was well-toler- and maintenance study evaluated etrolizumab ated. In CD, initial results from the phase III against placebo in anti-TNF naı¨ve UC patients. At BERGAMOT study investigating etrolizumab in week 62, there was no significant difference in clini- moderately to severely active CD showed that CDAI cal remission rates. There was a statistically signifi- remission at week 14 was greater in both the 105 mg cant difference in endoscopic improvement, and 210 mg arms compared with placebo (23% vs endoscopic remission, and histologic remission in 28.9% vs 16.9%, respectively) with comparable side the etrolizumab cohort at week 62 (38% vs 22.5%, effects between the groups [15]. P ¼ 0.024; 30.6% vs 16.7%, P ¼ 0.03 and 42.4% vs Another molecule targeting the a4b7 integrin is 21.8%, P ¼ 0.008; respectively). Etrolizumab was the monoclonal IgG2 antibody abrilumab (AMG- well-tolerated throughout the follow-up period 181). This drug has shown preliminary efficacy in [13&]. The GARDENIA study was a head-to-head both UC and CD. In UC patients with moderately to induction and maintenance study comparing etro- severely active disease, a randomized, phase 2b, lizumab to infliximab. The primary outcome was placebo-controlled, double-blind study including not met with clinical remission rates at week 10 and 354 patients showed significantly increased week 8 54 of 18.6% and 19.7% in the etrolizumab and remission rates at dosages of 70 and 210 mg compared infliximab cohorts respectively. Endoscopic remis- with placebo (13.3%, 12.7% vs 4.3%, P < 0.05, respec- sion was similar between the groups and the safety tively). In total, 51% of the study population had 0267-1379 Copyright ß 2021 Wolters Kluwer Health, Inc. All rights reserved. www.co-gastroenterology.com 359 Copyright © 2021 Wolters Kluwer Health, Inc. All rights reserved. Inflammatory bowel disease prior anti-TNF exposure and 44% were on oral corti- resulted in a significant improvement in modified costeroids at baseline. Overall abrilumab was well- Mayo clinical scores and significantly greater
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