Jae Hyuk Choi

Keimyung University, Sŏul, Seoul, South Korea

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Publications (13)21.97 Total impact

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    ABSTRACT: The quality of life (QOL) of patients who survive early gastric cancer (EGC) is an area of increasing interest. To compare the QOL and degree of worry of cancer recurrence in EGC patients who underwent endoscopic submucosal dissection (ESD) or surgery. Cross-sectional study. A tertiary referral center. A total of 565 patients with EGC who received ESD or surgery. Questionnaires. QOL was evaluated using the Short-form Health Survey and the European Organization for Research and Treatment of Cancer QOL questionnaires (QLQ-C30 and EORTC-QLQ-STO22). Mood disorders and the worry of cancer recurrence were estimated using the Hospital Anxiety and Depression Scale (HADS) and Worry of Cancer Scale, respectively. Questionnaires were completed by 55.7% of the ESD (137/246) and 58.9% of the surgery (188/319) patients. The surgery group had more QOL-related symptomatic and functional problems, including fatigue (P = .044), nausea/vomiting (P = .032), appetite loss (P = .023), diarrhea (P < .001), pain (P = .013), reflux symptoms (P = .005), eating restrictions (P < .001), anxiety (P = .015), taste impairment (P = .011), and poor body image (P < .001). The ESD group had significantly higher worry of cancer recurrence scores after adjusting for covariates, especially when visiting their physicians. The HADS results did not differ between the groups. Cross-sectional design. Endoscopic treatment for EGC provides a better QOL, but stomach preservation might provoke cancer recurrence worries. Endoscopists should address this issue for relieving a patient's concern of cancer recurrence during follow-up period after ESD. (Clinical trial registration number: WHO ICTRP KCT0000791.). Copyright © 2015 American Society for Gastrointestinal Endoscopy. Published by Elsevier Inc. All rights reserved.
    Gastrointestinal endoscopy 04/2015; DOI:10.1016/j.gie.2015.01.019 · 4.90 Impact Factor
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    ABSTRACT: Despite the rising incidence and prevalence of inflammatory bowel disease (IBD) in Asian populations, data regarding clinical characteristics of patients in Asia based on age at diagnosis are relatively sparse. The aim of this study was to compare clinical characteristics based on the age at diagnosis according to the Montreal Classification in Korean IBD patients. We recruited consecutive patients with IBD at two tertiary hospitals and retrospectively reviewed their medical information. Patients were divided into three groups according to their age at diagnosis: youth (<17 years), young adult (17-40 years), and middle-old (>40 years). The main clinical characteristics for comparison were the achievement of a remission state at the last follow-up visit, cumulative rate of surgery, and cumulative use of immunomodulators and tumor necrosis factor-α (TNFα) blockers during the follow-up period. In total, 346 IBD patients were included (Crohn's disease [CD] 146 and ulcerative colitis 200; 36 youth, 202 young adult, and 113 middle-old). The middle-old group with CD was characterized by a predominance of uncomplicated behavior (P=0.013) and a lower frequency of perianal disease (P=0.009). The middle-old group was associated more with a less aggressive disease course than the younger group, as shown by more frequent remission (P=0.004), being less likely to undergo surgery (P<0.001), and lower cumulative use of immunomodulators and TNFα blockers (P<0.001). Age at diagnosis according to the Montreal Classification is an important prognostic factor for Korean IBD patients.
    01/2015; 13(1):60-7. DOI:10.5217/ir.2015.13.1.60
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    ABSTRACT: Given the characteristic procedures involved in the endoscopy unit, the spread of pathogens is much more frequent in this unit than in other environments. However, there is a lack of data elucidating the existence of pathogens in the endoscopy unit. The aim of this study was to detect the presence of possible pathogens in the endoscopy unit.
    10/2014; 12(4):306-12. DOI:10.5217/ir.2014.12.4.306
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    ABSTRACT: Aneurysms arising from non-branching sites of the supraclinoid internal carotid artery (ICA) are considered rare, accounting for only 0.9-6.5% of all ICA aneurysms. They are thin-walled, broad-based, can easily rupture during surgery, and are referred to as dorsal, superior, anterior, or ventral wall ICA aneurysms, as well as blister-like aneurysms. Various treatment modalities are available for blister-like aneurysms, but with varying success. Here, we report on two cases of saccular shaped dorsal wall aneurysms. Both patients were transferred to the emergency department with subarachnoid hemorrhage because of an aneurysmal rupture. Computed tomography angiography and transfemoral cerebral angiography (TFCA) showed a dorsal wall aneurysm in the distal ICA. We performed clipping on the wrapping material (Lyodura®, temporal fascia). Follow-up TFCA showed rapid configuration changes of the right distal ICA. Coil embolization was also performed as a booster treatment to prevent aneurysm regrowth. Both patients were discharged without neurologic deficit. No evidence of aneurysm regrowth was observed on follow-up TFCA at two years. Dorsal wall ICA aneurysms can change in size over a short period; therefore, follow-up angiography should be performed within the short-term. In cases of regrowth, coil embolization should be considered as a booster treatment.
    09/2014; 16(3):303-8. DOI:10.7461/jcen.2014.16.3.303
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    ABSTRACT: Patients with cervical ossification of posterior longitudinal ligament (OPLL) are susceptible to cord injury, which often develops into myelopathic symptoms. However, little is known regarding the prognostic factors that are involved in minor trauma. We evaluated the relationship between minor trauma and neurological outcome of OPLL and investigated the prognostic factors with a focus on compressive factors and intramedullary signal intensity (SI).
    Journal of Korean Neurosurgical Society 08/2014; 56(2):121-9. DOI:10.3340/jkns.2014.56.2.121 · 0.52 Impact Factor
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    ABSTRACT: To compare outcomes using the novel portable endoscopy with that of nasogastric (NG) aspiration in patients with gastrointestinal bleeding.
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    ABSTRACT: To compare the esophagogastric junction (EGJ) areas observed in sedated and non-sedated patients during esophagogastroduodenoscopy (EGD). Data were collected prospectively from consecutive patients who underwent EGD for various reasons. The patients were divided into three groups according to the sedation used: propofol, midazolam, and control (no sedation). The EGJ was observed during both insertion and withdrawal of the endoscope. The extent of the EGJ territory observed was classified as excellent, good, fair, or poor. In addition, the time the EGJ was observed was estimated. The study included 103 patients (50 males; mean age 58.44 ± 10.3 years). An excellent observation was achieved less often in the propofol and midazolam groups than in the controls (27.3%, 28.6% and 91.4%, respectively, P < 0.001). There was a significant difference in the time at which EGJ was observed among the groups (propofol 20.7 ± 11.7 s vs midazolam 16.3 ± 7.3 s vs control 11.6 ± 5.8 s, P < 0.001). Multivariate analysis showed that sedation use was the only independent risk factor for impaired EGJ evaluation (propofol, OR = 24.4, P < 0.001; midazolam, OR = 25.3, P < 0.001). Hiccoughing was more frequent in the midazolam group (propofol 9% vs midazolam 25.7% vs control 0%, P = 0.002), while hypoxia (SaO2 < 90%) tended to occur more often in the propofol group (propofol 6.1% vs midazolam 0% vs control 0%, P = 0.101). Sedation during EGD has a negative effect on evaluation of the EGJ.
    World Journal of Gastroenterology 05/2014; 20(18):5527-32. DOI:10.3748/wjg.v20.i18.5527 · 2.43 Impact Factor
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    ABSTRACT: In this study, we show that atraxia telangiectasia mutated kinase (ATM) activity is generally upregulated by different apoptotic stimuli, i.e. TNF-α, TRAIL, paclitaxel, or UV. Apoptotic progression is markedly attenuated by siATM-RNA through down regulation of caspase-8 and caspase-9 in parallel with decreases in FLIP-S (short form of cellular FLICE inhibitory protein) protein levels and Bid cleavage. In addition, ATM activity is upregulated through t-Cdc6 while caspase-8 and caspase-9 activities increase. Taken together, we suggest that ATM regulates caspase-8 activation by influencing levels of FLIP-S, ATM kinase activity is upregulated by t-Cdc6, and increased ATM activity plays an essential role in the amplification of apoptosis in TNF-α-stimulated HeLa cells.
    FEBS letters 02/2014; 588(6). DOI:10.1016/j.febslet.2014.01.050 · 3.34 Impact Factor
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    ABSTRACT: The effects of process parameters on gas penetration depth of gas-assisted injection moulding (GAIM) were investigated for polypropylene (PP) and 316 stainless steel (SUS316L) powder feedstock by the Taguchi method. The process parameters were melt temperature, shot size, gas pressure, and gas delay time. The most significant parameters affecting gas penetration depth were shot size for PP and gas delay time for SUS316L, respectively. The different significance of gas delay time between SUS316L and PP was mainly due to the higher thermal diffusivity and cooling effect of SUS316L as compared to PP. Simulation was also conducted to compare the thermal and rheological properties of materials and to analyse gas penetration behaviour. The higher thermal diffusivity and cooling effect of the SUS316L also caused the increase of the viscosity and shear heating for SUS316L at the time of gas injection. Gas fingering behaviour by the shear heating effect was confirmed.
    International Journal of Materials and Product Technology 01/2014; 48(1/2/3/4):66 - 79. DOI:10.1504/IJMPT.2014.059045 · 0.28 Impact Factor
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    ABSTRACT: Endoscopic submucosal dissection (ESD) is an effective procedure for en-bloc curative resection of the colorectal tumor. As it requires high technical skills and experience in therapeutic endoscopy, it is important to understand learning curve of ESD technique. The aim of this study was to retrospectively describe the clinical results of ESD and to evaluate learning curve for the ESD of colorectal tumors.
    The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi 01/2014; 64(4):198. DOI:10.4166/kjg.2014.64.4.198
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    ABSTRACT: The use of self-expandable metal stents (SEMS) for the treatment of malignant colorectal obstruction is increasing. However, results of risk factors for its complications are inconsistent. This study aimed to examine the clinical effectiveness of the procedure as well as the complications and risk factors associated with the complications. Medical records of patients with malignant colorectal obstruction who underwent endoscopic placement of covered or uncovered SEMS were reviewed retrospectively. The procedure was performed by two endoscopists with experience in pancreatobiliary endoscopy. A total of 152 patients were included (102 men; mean age, 70 +/- A 12.5 years). The procedure was performed for palliative management in 83 patients and performed as a bridge to surgery in 69 patients. There were 111 uncovered stents and 41 covered stents. The technical success rate was 100 % and the clinical success rate 94.1 %. Overall complications were observed in 49 patients (32.2 %) during the follow-up period (median, 98 days; interquartile range, 19-302 days). Obstruction (17.1 %), migration (7.9 %), perforation (5.2 %), bleeding (1.3 %), and tenesmus (0.7 %) were the causes of the complications. Stage IV disease, carcinomatosis peritonei, complete obstruction of the colon, palliative intention, and covered stents increased the complications based on the univariate analysis. Multivariate analysis revealed that complete obstruction of the colon and covered stents were significantly independent risk factors for complications. In the palliative group, Kaplan-Meier analysis showed significantly shorter median duration to the onset of complications in the covered stent group than in the uncovered stent group. Although SEMS in patients with malignant colorectal obstruction is effective both as palliative therapy and as a bridge to surgery, one-third of patients experienced complications. Severity of obstruction and stent type can influence outcomes.
    Surgical Endoscopy 03/2013; 27(9). DOI:10.1007/s00464-013-2897-4 · 3.31 Impact Factor
  • Jae Hyuk Choi, Dong Seok Cha, Hoon Jeon
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    ABSTRACT: ETHNOPHARMACOLOGICAL RELEVANCE: Prunus padus Linne has been widely used as a traditional medicine, with beneficial effects in numerous diseases, including stroke, neuralgia and hepatitis. In this study, we demonstrated anti-inflammatory and anti-nociceptive activities of the methylene chloride fraction of P. padus (MPP). MATERIALS AND METHODS: In vitro studies, the anti-inflammatory effects of MPP were examined using IFN-γ/LPS-activated murine peritoneal macrophage model. To confirm the anti-inflammatory effects of MPP in vivo, trypsin-induced paw edema test was also conducted. The anti-nociceptive activities of MPP were measured using various experimental pain models including thermal nociception methods such as the tail immersion test and the hot plate test as well as chemical nociception methods like acetic acid-induced writhing test and formalin test. To determine whether analgesic activity of MPP is connected with the opioid receptor, we carried out combination test with naloxone, a nonselective opioid receptor antagonist. RESULTS: In the current study, MPP showed potent inhibitory effect on IFN-γ/LPS-induced NO production. MPP also suppressed not only iNOS enzyme activity but also iNOS expression. Moreover, MPP inhibited COX-2 expression dose dependently. IFN-γ/LPS stimulation induced the translocation of NF-κB to nucleus but it was attenuated in the presence of MPP. In vivo study revealed that MPP could reduce paw volume after subplantar injection of trypsin. In addition, MPP showed potent analgesic activities both thermal and chemical nociception compared to tramadol and indomethacin. Furthermore, pre-treatment of naloxone slightly suppress the analgesic activity of MPP indicating that MPP acts as a partial opioid receptor agonist. CONCLUSIONS: In the present study, MPP showed potent anti-inflammatory properties through not only by suppressing various inflammatory mediators in vitro, but reducing the inflammatory edema in vivo. MPP also exhibited strong anti-nociceptive activities via both central and peripheral mechanism by acting as a partial opioid agonist. Based on these results we suggest that P. padus has the potential to provide a therapeutic approach to inflammation-mediated chronic diseases as an effective anti-inflammatory agent and painkiller.
    Journal of ethnopharmacology 09/2012; 144(2). DOI:10.1016/j.jep.2012.09.023 · 2.94 Impact Factor
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    ABSTRACT: The Cdc6 protein, a key DNA replication initiation factor, contributes to the long-term maintenance of the S-phase checkpoint by anchoring the Rad3-Rad26 complex to chromatin. Here, we demonstrate that ATR (AT mutated and Rad3 related) activity is essential for maintaining high chromatin levels of the Cdc6 protein, thereby delaying entry into mitosis during hydroxyurea (HU)-induced S-phase arrest of HeLa cells. Downregulation of ATR (AT mutated and Rad3 related) (i.e., using ATR-siRNA) reduced the protein levels of chromatin Cdc6 and significantly increased the cellular levels of phospho-histone H3 (Ser 10), an index of mitosis. Downregulation of Cdc6 was completely restored by pretreatment with MG132, a proteasome inhibitor. Moreover, mitotic entry of MG132-pretreated cells was significantly downregulated. Our results also show that ATR (AT mutated and Rad3 related) kinase phosphorylates Cdc6 at serine residue 6. Thus, this ATR (AT mutated and Rad3 related)-mediated phosphorylation of Cdc6 is likely associated with stabilization of Cdc6 protein, thereby maintaining high levels of chromatin Cdc6 and delaying premature mitotic entry. This novel mechanism likely contributes to the functional regulation of chromatin Cdc6, which delays the cell cycle of hydroxyurea-induced cells to enter mitosis at the S-phase checkpoint.
    The international journal of biochemistry & cell biology 06/2009; 41(6):1410-20. DOI:10.1016/j.biocel.2008.12.014 · 4.24 Impact Factor

Publication Stats

25 Citations
21.97 Total Impact Points


  • 2013–2015
    • Keimyung University
      • Dongsan Medical Center
      Sŏul, Seoul, South Korea
  • 2014
    • Inje University Paik Hospital
      • Department of Neurosurgery
      Sŏul, Seoul, South Korea
    • Ajou University
      • Department of Mechanical Engineering
      Sŏul, Seoul, South Korea
  • 2009–2014
    • Seoul National University
      • College of Pharmacy
      Sŏul, Seoul, South Korea
  • 2012
    • Woosuk University
      완주, Jeollabuk-do, South Korea