Publications by authors named "Mark A Samaan"

Background And Aims: Assessing endoscopic activity is integral in the management of postoperative Crohn's disease (CD). We aimed to comprehensively characterize the reliability and responsiveness of different endoscopic instruments when used to assess postoperative CD activity.

Methods: Ileocolonoscopy videos (n=70) from the PREVENT trial were reviewed by three blinded central readers.

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Background And Aims: We conducted a prospective study (FAVOUR) of patients with UC commencing vedolizumab to investigate faecal vedolizumab loss and its impact on serum levels and treatment outcomes.

Methods: FAVOUR recruited patients with moderate-to-severe UC commencing vedolizumab. Faecal vedolizumab levels (FVL) were measured at days 1, 4, 7 and at weeks 2, 6 and 14.

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Background & Aims: No fully validated indices to measure pouchitis activity exist. We aimed to develop and externally validate a novel endoscopic and histologic index.

Methods: Endoscopists and pathologists used 11 (4 endoscopic, 4 histologic, 3 composite) existing indices and items from a prior Research and Development/University of California Los Angeles appropriateness exercise to assess pouchitis disease activity in videos and images from 98 patients with chronic antibiotic-refractory pouchitis who participated in a randomized placebo-controlled alicaforsen trial.

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Sphingosine 1 phosphate receptor (S1PR) modulators are the latest drug class to have received approval for the treatment of ulcerative colitis, and have brought a new mechanism of action to this landscape. They target immune cell trafficking, specifically the egress of lymphocytes from lymph nodes to the bloodstream, and have proven to be an efficacious and safe anti-inflammatory mechanism. This narrative review aims to distil the key trial data on the efficacy and safety of ozanimod and etrasimod, the two S1PR modulators currently licensed for use in UC.

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Objective: To evaluate real-world patient-reported experience with subcutaneous (SC) risankizumab administered by on-body device (OBD) in patients with Crohn's disease (CD).

Methods: Uncontrolled observational cross-sectional study in five UK units between October 2023 and May 2024. Patients who had received maintenance risankizumab SC injection of four pre-filled syringes (PFS) self-administered in hospital were switched to OBD self-injection.

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Background: Children and young people with severe neurodisabling conditions (CYPSND)experience severe functional gastrointestinal symptoms and dependence on artificial nutrition. 'Gastrointestinal dystonia' (GID) has been applied by clinicians when symptoms become debilitating and potentially life-limiting. Evidence is lacking regarding the definition and appropriate management of GID.

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Background: Therapeutic drug monitoring is important for optimizing anti-tumor necrosis factor-α (TNF-α) therapy in inflammatory bowel disease. However, the exposure-response relationship has never been assessed in pouchitis.

Aims: To explore associations between anti-TNF-α drug concentration and pouchitis disease activity in patients with a background of ulcerative colitis.

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Crohn's disease (CD) is a chronic inflammatory bowel disease (IBD) characterised by endoscopic inflammation, progressive bowel damage and gastrointestinal lesions. Although treatment strategies for CD have traditionally focused on a stepwise pharmacological approach to achieve clinical remission or symptom resolution, these treatment goals correlate poorly with disease activity. Thus, achieving full clinical remission and full endoscopic healing alone may be insufficient, as patients may remain at risk of inflammatory complications.

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Background: Janus kinase inhibitors (JAKi) are small molecule drugs with demonstrated efficacy in inflammatory bowel disease (IBD). However, widespread utilisation may be hindered by safety concerns.

Aims: This is the first study assessing risk-benefit perceptions and clinical practices of those using JAKi for IBD.

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Objective: The second iteration of the Selecting Therapeutic Targets in Inflammatory Bowel Disease (STRIDE-II) initiative recommends use of the Simple Endoscopic Score for Crohn's disease (SES-CD) as a treatment target for patients with CD. We aimed to assess whether the STRIDE-II endoscopic endpoints are achievable and whether the degree of mucosal healing (MH) affects long-term outcomes.

Design/method: We performed a retrospective observational study between 2015 and 2022.

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Objective: Ustekinumab is an interleukin-12/interleukin-23 receptor antagonist licensed for the treatment of ulcerative colitis (UC). Clinical trial data were promising; however, real-world data are limited. We assessed the safety and effectiveness of ustekinumab in UC in a real-world setting.

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Article Synopsis
  • The study examines the effectiveness of sequential drug treatments for ulcerative colitis (UC), specifically comparing the use of vedolizumab (VDZ) and anti-TNF therapies as second-line treatments.
  • Researchers analyzed data from patients who switched treatments between May 2013 and August 2020, looking at various health outcomes over a 52-week period.
  • Results indicated that patients receiving VDZ after anti-TNF had significantly better treatment persistence, colectomy-free survival, and clinical remission compared to those receiving anti-TNF after VDZ, suggesting a favorable effect of the treatment order on patient outcomes.
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Background: Low-quality evidence suggests that pre-operative exclusive enteral nutrition (E/EN) can improve postoperative outcomes in patients with Crohn's disease (CD). It is not standard practice in most centres.

Aims: To test the hypothesis that pre-operative EN in patients undergoing ileal/ileocolonic surgery for CD is associated with improved postoperative outcome.

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Background And Aims: Thromboprophylaxis use in paediatric inflammatory bowel disease [IBD] is inconsistent. Current guidelines only support treating children with acute severe colitis with risk factors. We convened an international RAND panel to explore thromboprophylaxis in paediatric IBD inpatients in the context of new evidence.

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Background And Aim: Patients with chronic diseases are believed to be at increased risk of mental health conditions during the COVID-19 pandemic. We aimed to assess the incidence of psychological morbidity in inflammatory bowel disease (IBD) patients during the COVID-19 pandemic, explore for association with risk of severe COVID-19 and other factors, and establish patients' interest in psychological support.

Methods: A survey including the Patient Health Questionnaire-9, General Anxiety Disorder-7, and Perceived Stress Scale tools for depression, anxiety, and stress was administered to IBD patients from a tertiary center in London, United Kingdom, in June 2020.

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Article Synopsis
  • The WHO identifies iron deficiency anaemia (IDA) as the most prevalent nutritional deficiency globally, affecting 30% of people, mainly due to factors like gastrointestinal bleeding, menstruation, poor diet, and low iron absorption.
  • Treatment for IDA focuses on replenishing iron levels and restoring normal haemoglobin, which can enhance quality of life and improve health outcomes in chronic diseases and pregnancy.
  • The article covers updated strategies for diagnosing and managing IDA in patients with chronic conditions and during pregnancy, comparing oral and intravenous iron treatments, along with a cost analysis of various iron supplements.
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Background: Current practice in cardiogenic shock is guided by expert opinion in guidelines and scientific statements from professional societies with limited high quality randomized trial data to inform optimal patient management. An international panel conducted a modified Delphi process with the intent of identifying aspects of cardiogenic shock care where there was uncertainty regarding optimal patient management.

Methods: An 18-person multidisciplinary panel comprising international experts was convened.

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Background: Biologics account for a significant cost in inflammatory bowel disease (IBD) management; however, switching from infliximab originator to its biosimilars has enabled cost saving without compromising disease control. The effects on IBD activity and infliximab trough levels of a second switch to another biosimilar are, however, uncertain.

Aims: To assess the effects on disease activity and infliximab trough levels associated with switching from infliximab biosimilar CT-P13 to another biosimilar SB2 and compare outcomes in those switching for the first and second time.

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Background: COVID-19 has become the most common cause of acute respiratory distress syndrome (ARDS) worldwide. Features of the pathophysiology and clinical presentation partially distinguish it from 'classical' ARDS. A Research and Development (RAND) analysis gauged the opinion of an expert panel about the management of ARDS with and without COVID-19 as the precipitating cause, using recent UK guidelines as a template.

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Background: Pouchitis is a condition with large unmet medical needs and no approved therapies. Lack of validated instruments to measure disease activity and treatment response is a major barrier to drug development.

Aim: To conduct a modified RAND/University of California Los Angeles appropriateness process to produce a standardised assessment of pouchitis disease activity in clinical trials.

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Introduction: Ustekinumab, an interleukin-12 and interleukin-23 antagonist, is licensed for the treatment of Crohn's disease (CD) and ulcerative colitis (UC) after the phase III trial programs demonstrated efficacy over placebo. However, these findings may not be directly transferable to the real-world due to the stringent inclusion criteria of clinical trials.

Methods: We conducted a systematic review and meta-analysis of the safety and effectiveness of ustekinumab in inflammatory bowel disease (IBD).

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