Publications by authors named "Sean McGuire"

Objectives: Non-functioning Pancreatic Neuroendocrine Tumors (NF-PNET) are rare tumors with heterogeneous biology. Radiology and serum biomarkers are used for post-resection surveillance; however, no universally established protocol exists. Serum Chromogranin A (CgA) concentration is elevated in NF-PNET, and generally correlates with burden of disease; many CgA studies include mixed gastrointestinal and pancreatic populations.

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Accumulation of triacylglycerols (TAGs) is crucial during various stages of plant development. In Arabidopsis, two enzymes share overlapping functions to produce TAGs, namely acyl-CoA:diacylglycerol acyltransferase 1 (DGAT1) and phospholipid:diacylglycerol acyltransferase 1 (PDAT1). Loss of function of both genes in a dgat1-1/pdat1-2 double mutant is gametophyte lethal.

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Purpose: Trimodality therapy for muscle-invasive bladder cancer (MIBC) yields similar oncologic outcomes compared to radical cystectomy in appropriately selected patients; however, data regarding locally advanced MIBC (LA-MIBC) is limited. We explored our experience with LA-MIBC undergoing radiation therapy (RT).

Methods: We retrospectively identified 30 patients from an institutional prospectively collated database with non-metastatic, LA-MIBC.

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Background: Proton therapy (PT) has unique biologic properties with excellent clinical outcomes for the management of localized prostate cancer. Here, we aim to characterize the toxicity of PT for patients with localized prostate cancer and propose mitigation strategies using a large institutional database.

Methods: We reviewed medical records of 2772 patients with localized prostate cancer treated with definitive PT between May 2006 through January 2020.

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Objective: Surgical transgastric pancreatic necrosectomy (STGN) has the potential to overcome the shortcomings (ie, repeat interventions, prolonged hospitalization) of the step-up approach for infected necrotizing pancreatitis. We aimed to determine the outcomes of STGN for infected necrotizing pancreatitis.

Materials And Methods: This observational cohort study included adult patients who underwent STGN for infected necrosis at two centers from 2008 to 2022.

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The ubiquitous inflammophilic oral pathobiont Fusobacterium nucleatum (Fn) is widely recognized for its strong association with inflammatory dysbiotic diseases and cancer. Fn is subdivided into four subspecies, which are historically considered functionally interchangeable in the oral cavity. To test this assumption, we analyzed patient-matched dental plaque and odontogenic abscess clinical specimens and examined whether an inflammatory environment selects for/against particular Fn subspecies.

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Article Synopsis
  • A study explored the significance of poor prostate-specific antigen (PSA) response to neoadjuvant androgen deprivation therapy (ADT) in men with high-risk prostate cancer receiving radiation therapy, indicating potential for worse long-term outcomes.!
  • Out of 930 men analyzed, 57% had a poor PSA response (PSA >0.5 ng/mL), linked to increased risks of metastasis, biochemical recurrence, prostate-specific mortality, and overall survival rates.!
  • The findings suggest that patients with elevated PSA levels post-ADT might face more severe disease progression, highlighting the need for closer monitoring and tailored treatment strategies in this group.!
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Background: Sphincter of Oddi dysfunction (SOD) is managed primarily by endoscopic sphincterotomy (ES); however, surgical transduodenal sphincteroplasty (TDS) is a treatment option for select patients. In our high-volume pancreatico-biliary practice, we have observed variable outcomes among TDS patients; therefore, we sought to determine preoperative predictors of durable improvement in quality of life.

Methods: SOD patients treated by TDS between January 2006 and December 2015 were studied.

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The ubiquitous inflammophilic pathobiont is widely recognized for its strong association with a variety of human dysbiotic diseases such as periodontitis and oral/extraoral abscesses, as well as multiple types of cancer is currently subdivided into four subspecies: subspecies () ( (), and (). Although these subspecies have been historically considered as functionally interchangeable in the oral cavity, direct clinical evidence is largely lacking for this assertion. Consequently, we assembled a collection of oral clinical specimens to determine whether subspecies prevalence in the oral cavity stratifies by local oral health status.

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Necrotizing pancreatitis (NP) affects 20 % of the 300,000 patients diagnosed with acute pancreatitis every year. Mechanical intervention to debride necrotic and/or infected pancreatic and peripancreatic tissue is frequently required. Minimally invasive approaches to treat pancreatic necrosis have gained popularity over the last two decades, including transgastric pancreatic necrosectomy.

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Objectives: To evaluate patients with clinical (c)T4 prostate cancer (PCa), which represent both a heterogenous and understudied population, who often present with locally advanced disease and obstructive symptoms causing significant morbidity and mortality. We analysed whether receiving definitive local therapy influenced symptomatic and oncological outcomes.

Methods: Retrospective analysis of 154 patients with cT4 PCa treated at a single institution in 1996-2020.

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Importance: Despite evidence demonstrating an overall survival benefit with up-front hormone therapy in addition to established synergy between hormone therapy and radiation, the addition of metastasis-directed therapy (MDT) to hormone therapy for oligometastatic prostate cancer, to date, has not been evaluated in a randomized clinical trial.

Objective: To determine in men with oligometastatic prostate cancer whether the addition of MDT to intermittent hormone therapy improves oncologic outcomes and preserves time with eugonadal testosterone compared with intermittent hormone therapy alone.

Design, Setting, Participants: The External Beam Radiation to Eliminate Nominal Metastatic Disease (EXTEND) trial is a phase 2, basket randomized clinical trial for multiple solid tumors testing the addition of MDT to standard-of-care systemic therapy.

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Acute pancreatitis is associated with a readmission rate ranging from 7 to 34%. Readmission rates are highest among biliary (4-37%) and alcohol-induced (2-60%) acute pancreatitis. Severe acute pancreatitis and necrotizing pancreatitis have readmission rates ranging from 20 to 75%.

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Background: Although high-volume centers are known to have better surgical outcomes, patients with pancreatic adenocarcinoma often receive chemotherapy at treatment centers closer to home. This study aimed to determine whether treatment site of neoadjuvant therapy relative to surgery location impacts surgical timing and long-term outcomes.

Methods: All patients with pancreatic adenocarcinoma who underwent oncologic resection at a single, high-volume institution between January 2016 and February 2020 and had neoadjuvant chemotherapy before surgery were queried from a prospectively maintained database.

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Background: Obesity is epidemic in the USA. Limited data exist examining obesity's influence on necrotizing pancreatitis (NP) disease course.

Methods: Retrospective review of prospectively maintained database of 571 adult necrotizing pancreatitis patients treated between 2007 and 2018.

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Necrotizing pancreatitis is characterized by a prolonged disease course requiring frequent hospitalization and intervention. Necrotizing pancreatitis patients have high rates of intensive care unit admission and organ failure. Critical illness is an identified risk factor for the development of anxiety, depression, and posttraumatic stress disorder.

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Article Synopsis
  • The treatment of necrotizing pancreatitis (NP) has changed from early open surgery to a less invasive approach, leading to a hypothesis that patient outcomes have improved over time.* -
  • A study analyzed 767 NP patients treated over two periods (2005-2010 early group and 2011-2019 late group) to compare interventions, morbidity, and mortality.* -
  • Results showed no differences in patient demographics or mortality, but the late group had fewer surgeries, shorter disease duration, and increased use of endoscopic interventions compared to the early group.*
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Parvimonas micra is a Gram-positive obligate anaerobe and a typical member of the human microbiome. P. micra is among the most highly enriched species at numerous sites of mucosal dysbiotic disease and is closely associated with the development of multiple types of malignant tumors.

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Background: The clinical significance of postoperative serum pancreatic enzyme elevation after pancreatoduodenectomy is understudied. We hypothesized that elevation in serum enzymes predicts morbidity and mortality after pancreatoduodenectomy.

Methods: Retrospective review of 677 patients who underwent pancreatoduodenectomy at a single institution from 2013 to 2019.

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Objectives: Select patients with anatomically favorable walled off pancreatic necrosis may be treated by endoscopic (Endo-TGD) or operative (OR-TGD) transgastric debridement (TGD). We compared our experience with these 2 approaches.

Summary Background Data: Select necrotizing pancreatitis (NP) patients are suitable for TGD which may be accomplished endoscopically or surgically.

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Current best practice in placement of arterial lines is to attempt to cannulate the radial artery in the first instance. However, if the radial artery is difficult to cannulate there is no consensus among clinicians on how best to proceed. This article looks at the evidence for the different options.

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Background: Duodenal complications of necrotizing pancreatitis (NP) are challenging and understudied. We sought to characterize the demographics and clinical course of NP patients with duodenal complications.

Methods: Single institution retrospective review of 687 NP patients treated from 2005 to 2018.

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Background: Patients with necrotizing pancreatitis (NP) have the highest rate of venous thromboembolism (VTE) of any hospitalized patient (57%). We hypothesized that VTE prophylaxis might be inadequate in the setting of this profound inflammatory disease and that early detection of deep vein thrombosis would limit pulmonary embolism.

Study Design: All patients with NP treated at a single center between August 2018 and December 2019 were enrolled in prospective, weekly VTE screening, including 4-extremity duplex ultrasound.

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