Publications by authors named "David Choi"

Background: Mirikizumab, an anti-p19IL-23 monoclonal antibody, has shown efficacy and safety in treating moderately to severely active ulcerative colitis (UC) in clinical trials. We assessed the effectiveness and safety of mirikizumab for the treatment of UC in a real-world setting.

Methods: We conducted a prospective observational study of adult patients with UC who were started on mirikizumab for active disease between January 1, 2024, and April 30, 2024.

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Spinal cord injury causes a cascade of physiological responses, which may trigger a subsequent neurotoxic increase in intracellular sodium. This can lead to neurodegeneration, both at and beyond the site of injury, causing clinical symptoms and loss of function. However, in vivo measurements of tissue sodium remain challenging.

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Objective: To summarize the evidence and pharmacologic profile of guselkumab for moderate to severe ulcerative colitis (UC).

Data Sources: A PubMed search from inception to end of October 2024 using keywords was conducted. Additional information was obtained from abstracts and package insert.

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Thiopurines can be used to maintain remission in patients with inflammatory bowel disease. Thiopurines require regular blood count monitoring and, in specific patients, thiopurine metabolites for assessment of optimization and safety. We present the case of a 42-year-old woman with ulcerative colitis postcolectomy and ileal pouch-anal anastomosis with subsequent antibiotic-resistant diffuse pouchitis and prepouch ileitis.

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Risankizumab-rzaa (RZA) is a fully human immunoglobulin G monoclonal antibody (Mab) which has fewer immunogenic concerns compared with chimeric Mabs. The pivotal trials of RZA found no significant differences in infusion reactions between drug and placebo. This case illustrates successful transition to subcutaneous RZA following a serious hypersensitivity reaction to intravenous RZA.

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Background & Aims: Risankizumab is a selective interleukin-23 inhibitor approved for the treatment of Crohn's disease (CD). We report a large long-term real-world experience with risankizumab in CD.

Methods: We performed a prospective monitoring of clinical outcomes in patients at a large tertiary center who started treatment with risankizumab.

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Background: The purpose of this study is to investigate whether sex plays a role in donor-site dysfunction after head and neck reconstruction.

Methods: In this retrospective case series, 76 patients were assessed for donor-site morbidity using the Short Form 36, Short Musculoskeletal Function Assessment, disabilities of the arm, shoulder, and hand, and lower-limb core scale. Differences by sex were compared using -tests.

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Study Design: A systematic review and meta-analysis of individual participant and aggregated data.

Objectives: To define the learning curves of endoscopic discectomies using unified statistical methodologies.

Methods: Searches returned 913 records, with 118 full-text articles screened.

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Background Context: The majority of surgical training is conducted in real-world operations. High-fidelity surgical simulators may provide a safer environment for surgical training. However, the extent that it reflects real-world operations and surgical ability is often poorly characterized.

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Insurer or self-insured employer's plans are increasingly using copay accumulator, copay maximizer, and alternative funding programs (AFPs) to reduce plan spending on high-priced prescriptions. These programs differ in their structure and impact on patient affordability but typically decrease the insurer or self-insured employer's financial responsibility for high-priced drugs and increase the complexity of specialty medication access for patients. The aim of this primer is to describe the structure of copay accumulator, copay maximizer, and AFPs to improve understanding of these cost-shifting strategies and help clinicians and patients navigate medication access and affordability issues to minimize treatment delays or non-initiation.

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A Gram-negative, non-motile, and creamy-white coloured bacterium, designated CAU 1616, was isolated from sea sand collected at Ayajin Beach, Goseong-gun, Republic of Korea. The bacterium was found to grow optimally at 37 °C, pH 8.0-8.

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Purpose: Upadacitinib has been found to improve symptoms as early as day 1 in patients with inflammatory bowel disease. As a result, early and timely initiation of upadacitinib is paramount to prevent hospital admission for an acute flare. The purpose of this study was to identify the time to initiation of upadacitinib, comparing external specialty pharmacies (ESPs) to a health-system specialty pharmacy (HSSP).

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Background: Intratumoral heterogeneity (ITH) and tumor microenvironment (TME) of pancreatic ductal adenocarcinoma (PDAC) play important roles in tumor evolution and patient outcomes. However, the precise characterization of diverse cell populations and their crosstalk associated with PDAC progression and metastasis is still challenging.

Methods: We performed single-cell RNA sequencing (scRNA-seq) of treatment-naïve primary PDAC samples with and without paired liver metastasis samples to understand the interplay between ITH and TME in the PDAC evolution and its clinical associations.

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A Gram-stain-negative, aerobic, rod-shaped, motile, flagellated bacterial strain, designated as CAU 1639, was isolated from the tidal flat sediment on the Yellow Sea in the Republic of Korea. Growth of the isolate was observed at 20-37 °C, at pH 5.0-10.

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Background: In healthy people, the "fight-or-flight" sympathetic system is counterbalanced by the "rest-and-digest" parasympathetic system. As we grow older, the parasympathetic system declines as the sympathetic system becomes hyperactive. In our prior heart rate variability biofeedback and emotion regulation (HRV-ER) clinical trial, we found that increasing parasympathetic activity through daily practice of slow-paced breathing significantly decreased plasma amyloid-β (Aβ) in healthy younger and older adults.

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Article Synopsis
  • - Eosinophilic gastrointestinal diseases, which are on the rise, have unclear causes and treatment options, particularly for adults.
  • - The text discusses a specific case of eosinophilic gastroenteritis and colitis that also showed extraintestinal symptoms.
  • - Successful treatment for this case involved the use of adalimumab, a tumor necrosis factor α inhibitor.
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Article Synopsis
  • Mirikizumab is a new treatment option for moderate to severe ulcerative colitis (UC), showing a significantly higher rate of clinical remission compared to placebo in phase 3 studies LUCENT-1 and LUCENT-2.
  • The drug also met various secondary endpoints, including improvements in bowel urgency and the ability to maintain remission, though common side effects include infection, injection-site reactions, and headaches.
  • As the first selective interleukin 23 (IL-23) inhibitor approved for UC, further research is necessary to understand its use in both patients who have and haven't used biologic treatments before.
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Background: Many patients with transverse myelitis suffer from sensory loss below the spinal level of the lesion. This is commonly associated with chronic neuropathic pain. However, the presence of somatic pain below a complete thoracic sensory level after transverse myelitis is exceptionally rare, and it is unclear if surgical decompression is an effective form of treatment for these patients.

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Article Synopsis
  • The objective of the review is to evaluate the pharmacologic and clinical effectiveness of etrasimod for treating ulcerative colitis (UC).
  • A thorough search of PubMed and other literature revealed that etrasimod shows significantly better outcomes in achieving clinical remission compared to a placebo in phase 3 studies, with common side effects like anemia and headache.
  • Etrasimod is the second oral sphingosine-1-phosphate modulator for UC, offering similar efficacy to existing therapies but requiring safety assessments before and during treatment.
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Background And Aims: Ongoing efforts to break the therapeutic ceiling in inflammatory bowel disease include combination therapy approaches. Dual-targeted therapy (DTT) has been reported in case reports and small case series. This report describes our experience with ustekinumab (UST) and upadacitinib (UPA) as DTT in patients with Crohn's disease (CD).

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Background: Ozanimod is a first-in-class Sphingosine-1-phosphate (S1P) receptor modulator approved for the treatment of moderately to severely active ulcerative colitis (UC). Real world data describing use of ozanimod are limited.

Aim: To provide 1-year follow-up results of our UC patient cohort treated with ozanimod.

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L23 is a recognized cytokine involved in the pathogenesis of inflammatory bowel diseases (IBDs). The first IL23-targeting agent that became available for clinical use in IBD was Ustekinumab, a monoclonal antibody that targets p40, a shared subunit of both IL23 and IL12. Risankizumab (Skyrizi; Abbvie) is a humanized IgG1 monoclonal antibody which binds to the p19 subunit and therefore selectively inhibits IL23.

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Background: Esthesioneuroblastoma (ENB) is a rare neoplasm of the sinonasal tract. Currently, the optimal treatment includes maximal resection combined with radiotherapy and/or chemotherapy. Although ENBs often recur and have an aggressive clinical course, spinal metastases are extremely rare and the underlying molecular mechanisms are poorly understood.

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