Publications by authors named "Woo Hyun Paik"

Background: Managing symptoms of chronic pancreatitis (CP) remains a significant challenge. Korean Red ginseng (KRG), a well-known herbal supplement, has shown potential benefits in various health conditions, prompting its investigation in CP patients.

Methods: We conducted a single-arm, prospective clinical trial to evaluate the effect of KRG on quality of life in CP patients exhibiting mild symptoms, as defined by a Clinical Global Impression (CGI) score of 0 or 1.

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Background: The prognosis of biliary tract cancer (BTC) is poor, and recurrence rates remain high even after curative resection. This study aimed to compare the efficacy and safety of capecitabine and 5-fluorouracil/leucovorin (FL) as adjuvant treatments following curative resection in patients with BTC.

Methods: We retrospectively reviewed the medical records of patients with BTC (including gallbladder and extrahepatic and intrahepatic bile duct cancers) who underwent curative surgical resection and adjuvant chemotherapy between 2011 and 2023.

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Distal malignant biliary obstruction (dMBO) is a common complication of advanced malignancies, particularly pancreatic cancer and biliary tract cancer, requiring biliary drainage to relieve symptoms. Endoscopic drainage using self-expandable metal stents (SEMS) is widely preferred due to improved long-term patency compared with plastic stents. However, the choice between fully covered SEMS (FCSEMS) and uncovered SEMS (UCSEMS) remains controversial, primarily due to migration risks associated with FCSEMS.

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Background And Aims: Endoscopic papillectomy (EP) is a standard treatment for ampullary lesions (AL), typically small and confined to the papillary mound. Laterally spreading lesions (LSL) of the papilla Vateri are a rare AL subtype involving extensive duodenal mucosa. Data on EP outcomes for LSL are limited.

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Background And Study Aims: Management of hemobilia is often challenging. Recently, endoscopic hemostasis with a self-expandable metal stent (SEMS) has shown promising efficacy for controlling bleeding at the endoscopic sphincterotomy site. This study aimed to assess efficacy and feasibility of endoscopic hemostasis as bridge therapy for hemobilia.

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Objectives: This study evaluated the adequacy of using blood cultures alone for antibiotic therapy in mild-to-moderate acute cholangitis after adequate biliary drainage.

Methods: A prospective, multi-centre, non-inferiority, randomized trial was conducted from August 2015 to September 2023 across 12 tertiary hospitals in South Korea. Patients were randomly assigned 1:1 to groups.

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Background: Oxaliplatin is a commonly used platinum-based chemotherapy drug for patients with pancreatic cancer (PC). Drug resistance is a major challenge in PC treatment, underscoring the urgent need for new approaches. Targeting DNA damage repair, one of the factors responsible for platinum resistance, is an attractive strategy to overcome drug resistance.

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Objective: Ampullary neoplastic lesions can be resected by endoscopic papillectomy (EP) or transduodenal surgical ampullectomy (TSA) while pancreaticoduodenectomy is reserved for more advanced lesions. We present the largest retrospective comparative study analysing EP and TSA.

Design: Of all patients in the database, lesions with prior interventions, benign histology advanced malignancy (T2 and more), patients with hereditary syndromes and those undergoing pancreatoduodenectomy were excluded.

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Article Synopsis
  • * Analyzed data from 86 patients showed that multiple LN metrics were linked to overall survival (OS), disease-free survival (DFS), and distant metastasis-free survival (DMFS), particularly highlighting the number of metastatic LNs (LNN) as a strong predictor in multivariable analysis.
  • * Key findings included LNN ≥ 2 as a significant factor for OS, DFS, and DMFS, while lymph node ratio (LNR) was notable for DFS and DMFS; however, certain parameters like log odds of positive
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Background And Aims: Liver transplantation (LT) is a curative treatment for end-stage liver disease. Anastomotic biliary strictures (ABSs) are more common in living donor LT (LDLT). However, the success rate of ERCP for ABSs remains unsatisfactory.

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  • The study focused on creating a machine learning model to predict pulmonary embolism (PE) in patients with gastrointestinal cancers, who are at a higher risk for this condition.
  • Researchers analyzed data from 585 patients who had undergone computed tomographic pulmonary angiography (CTPA) across two hospitals, using factors like the Wells score and D-dimer levels to train the model.
  • The model demonstrated effectiveness by achieving an area under the receiver operating curve (AUROC) of 0.736 in one hospital and 0.669 in another, showing that it could significantly reduce unnecessary CTPA referrals compared to traditional diagnostic methods.
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Background/aims: A clinical unmet need persists for medications capable of modulating the progression of primary sclerosing cholangitis (PSC). This study aimed to assess the clinical feasibility of HK-660S (beta-lapachone) in PSC.

Methods: In this multicenter, randomized, double-blind, placebo-controlled, parallel-group phase 2 trial, participants were assigned in a 2:1 ratio to receive either 100 mg of HK-660S or a placebo twice daily for 12 weeks.

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  • Pancreatic cancer is linked to tissue stiffness caused by cancer-associated fibroblasts, and EUS-TA is used for diagnosis but often gives false negatives due to insufficient samples.
  • This study examined the relationship between tissue stiffness measured by EUS-elastography and the number of needle passes needed in EUS-TA for diagnosing pancreatic cancer.
  • Results showed that while the diagnostic yield remained similar across stiffness levels, patients with stiffer tumors required significantly more needle passes (3.6 vs. 3.2) to achieve a proper diagnosis.
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Background: Neoadjuvant treatment (NAT) is standard for borderline resectable pancreatic cancer (BRPC). However, consensus is lacking on the optimal surgical timing for patients with BRPC undergoing NAT. The aim of this study was to investigate the long-term outcomes of patients undergoing NAT for BRPC and suggest optimal resection timing.

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Background: The efficacy of adjuvant treatment (AT) in ampullary cancer (AmC) remains controversial. This systematic review and meta-analysis aimed to evaluate the role of AT for AmC.

Data Sources: A comprehensive systematic search was performed in PubMed, EMBASE, Cochrane Library, and Web of Science databases.

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Introduction: Endoscopic retrograde cholangiopancreatography (ERCP) plays an indispensable role in treating pancreato-biliary diseases but carries a risk of post-ERCP pancreatitis (PEP). Despite advances in the prevention strategies, prevention of PEP remains imperfect, necessitating more refined hydration methods. This study investigates the effectiveness of lactated Ringer's solution versus plasma solution in preventing PEP.

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  • The study looked at how to treat people with gallbladder stones before they get a kidney transplant (KT).
  • Out of many patients, those who had surgery to remove their gallbladder (cholecystectomy) before the transplant had fewer problems compared to those who didn’t.
  • The researchers found that having more stones, a thick gallbladder wall, or larger stones could make complications more likely, so they suggested that those with these risks might need surgery before KT.
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  • Endoscopic ultrasound-guided biliary drainage (EUS-BD) offers two techniques, choledochoduodenostomy (CDS) and hepaticogastrostomy (HGS), for treating distal malignant biliary obstruction when traditional methods fail.
  • A study comparing these two techniques found that EUS-CDS resulted in longer stent patency (770.3 days) compared to EUS-HGS (164.9 days), though both had high technical and clinical success rates.
  • The findings suggest that EUS-CDS is preferable due to its superior longevity and lower rates of adverse events, with systematic treatment after EUS-BD recommended to enhance stent performance.
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Pancreatic cancer is characterized by fibrosis/desmoplasia in the tumor microenvironment, which is primarily mediated by pancreatic stellate cells and cancer-associated fibroblasts. HGF/c-MET signaling, which is instrumental in embryonic development and wound healing, is also implicated for its mitogenic and motogenic properties. In pancreatic cancer, this pathway, along with its downstream signaling pathways, is associated with disease progression, prognosis, metastasis, chemoresistance, and other tumor-related factors.

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Background And Aims: It is difficult to differentiate between neoplastic and non-neoplastic gallbladder (GB) polyps before surgery. EUS-guided elastography (EUS-EG) is a noninvasive complementary diagnostic method. The utility of EUS-EG in the differential diagnosis of GB polyps has not been investigated.

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Background/aim: The efficacy of current chemotherapies for pancreatic ductal adenocarcinoma (PDAC) is still unsatisfactory. Flavopiridol inhibits multiple cyclin-dependent kinases, causing cell cycle arrest and inducing cancer cell apoptosis. This study aimed to evaluate the anti-tumor effect of flavopiridol and gemcitabine in PDAC in vitro and in vivo.

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Background: Sarcopenia or visceral adipose tissue has been reported to be related to pancreatic cancer prognosis. However, clinical relevance of the comprehensive analysis of body compositions and their longitudinal changes is lacking. This study analysed the association between body composition changes after chemotherapy and survival in patients with metastatic pancreatic cancer.

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