Woo Jin Chung

The University of Arizona, Tucson, Arizona, United States

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Publications (105)267.69 Total impact

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    ABSTRACT: Hemangioma is the most common type of benign tumor that arises in the liver. Although rupture and hemorrhage of hepatic hemangioma are rare complications, they can be the cause of mortality. The authors report a case of hemorrhagic hepatic hemangioma: in a 54-year-old woman who was admitted with epigastric pain. She had taken oral contraceptives several weeks prior. The results of a blood examination were normal. An abdominal computed tomography scan revealed a tumor in hepatic segment 4, and a hemorrhage inside the cystic mass was suspected. The mass was removed laparoscopically to confirm the tumor properties and control the hemorrhage. The pathologic findings of the resected mass were consistent with hepatic hemangioma with intratumoral hemorrhage. The patient was discharged 8 d after the surgery, without further complications or complaints, and the patient's condition was found to have improved during follow-up.
    06/2015; 21(23):7326-30. DOI:10.3748/wjg.v21.i23.7326
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    ABSTRACT: Hepatic angiosarcoma, a rare and aggressive liver malignancy, is difficult to diagnose because of a lack of specific clinical features. The clinical and radiological features of patients with histologically confirmed hepatic angiosarcoma were examined. Among 2,336 patients diagnosed with primary hepatic carcinoma at Keimyung University Dongsan Medical Center (Daegu, Korea) between May 2002 and February 2012, eight (0.03%) with histologically confirmed primary hepatic angiosarcoma were included. The patterns of disease diagnosis, tumor characteristics, treatment responses, and prognoses were reviewed retrospectively. Median age was 66 years-old (range, 41-80 years). Four patients were male. Five patients were compulsive drinkers. All patients had no HBsAg and anti-HCV. Initial radiologic diagnoses revealed primary hepatic angiosarcoma (n=2), hepatocellular carcinoma (n=2), hemangioma (n=2), and hepatic metastatic carcinoma (n=2). Definitive diagnoses were made by percutaneous needle biopsies in seven patients and surgical resection in one patient. At the time of the initial diagnosis, extrahepatic metastases were detected in three patients (37.5%). Metastatic sites included the spleen and lung, pericardium, and bone, in one patient each. Two patients underwent conservative treatments. The remaining patients underwent surgical resection (n=1), transcatheter arterial chemoembolization (n=1), and systemic chemotherapy (n=4). The median survival period was 214 days (range, 21-431 days). Hepatic angiosarcoma is a highly progressive disease with a poor prognosis. Detailed studies including histological examinations are essential to facilitate early diagnosis of the disease.
    The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi 04/2015; 65(4):229-35. DOI:10.4166/kjg.2015.65.4.229
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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: This multicenter, randomized, open-labeled, clinical trial evaluated the efficacy and safety of cisplatin/5-fluorouracil (5-FU) hepatic arterial infusion chemotherapy (CF-HAIC) versus adriamycin adding to CF-HAIC (ACF-HAIC) in advanced HCC patients. Fifty-six patients with advanced HCC were randomized to two treatment groups: (1) CF-HAIC group [n = 29, 5-FU, 500 mg/m(2) on days 1-3, and cisplatin, 60 mg/m(2) on day 2] and (2) ACF-HAIC group [n = 27, adriamycin, 50 mg/m(2) on day 1, 5-FU, 500 mg/m(2) on days 1-3, and cisplatin, 60 mg/m(2) on day 2] every 4 weeks via an implantable port system. Primary efficacy endpoint was overall survival (OS). Treatment response and time to progression were secondary endpoints. Treatment response rates did not differ significantly between the two treatment groups. Time to progression (5.4 vs. 5.8 months, P = 0.863) and OS (11.1 vs. 8.8 months, P = 0.448) were not significantly different. When the factors affecting patient OS were analyzed, disease control rate [P < 0.001, HR 6.437 (95 % CI 2.580-16.064)] was independently associated with OS. Age (≥60 years) and serum AFP level (≥200 ng/dL) also were significant factors for OS [P = 0.007, HR 4.945 (95 % CI 1.543-15.850), P = 0.048, HR 2.677 (95 % CI 1.010-7.095), respectively]. Grade 4 treatment-related toxicity and mortality was not observed in both groups. Although both HAIC regimens are safe and effective in patients with advanced HCC, HAIC adding adriamycin did not show delayed tumor progression and survival benefit compared to CF-HAIC in advanced HCC.
    Cancer Chemotherapy and Pharmacology 02/2015; 75(4). DOI:10.1007/s00280-015-2692-0 · 2.57 Impact Factor
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    ABSTRACT: The synthesis of polymeric materials using elemental sulfur (S8) as the chemical feedstock has recently been developed using a process termed inverse vulcanization. The preparation of chemically stable sulfur copolymers was previously prepared by the inverse vulcanization of S-8 and 1,3-diisopropenylbenzene (DIB); however, the development of synthetic methods to introduce new chemical functionality into this novel class of polymers remains an important challenge. In this report the introduction of polythiophene segments into poly(sulfur-random-1,3-diisopropenylbenzene) is achieved by the inverse vulcanization of S-8 with a styrenic functional 3,4-propylenedioxythiophene (ProDOT-Sty) and DIB, followed by electropolymerization of ProDOT side chains. This methodology demonstrates for the first time a facile approach to introduce new functionality into sulfur and high sulfur content polymers, while specifically enhancing the charge conductivity of these intrinsically highly resistive materials.
    ACS Macro Letters 01/2015; 4(1):111-114. DOI:10.1021/mz500730s · 5.24 Impact Factor
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    ABSTRACT: Azathioprine (AZA) has been widely used in the therapy of inflammatory bowel disease (IBD) and autoimmune hepatitis (AIH). However, studies evaluating the adverse effects of AZA in these two diseases are lacking. The aim of this study was to compare the adverse effects of AZA in Korean IBD and AIH patients. Patients with IBD or AIH who were treated with AZA at Keimyung University Dongsan Medical Center (Daegu, Korea) between January 2002 and March 2011 were enrolled. Their medical records were reviewed retrospectively in terms of clinical characteristics and adverse effects of AZA. A total of 139 IBD patients and 55 AIH patients were finally enrolled. Thirty IBD patients (21.6%) and eight AIH patients (14.5%) experienced adverse effects of AZA. In particular, the prevalence of leukopenia was significantly higher in the IBD group than in the AIH group (p=0.026). T474C mutation was observed in three of 10 patients who were assessed for thiopurine methyltransferase (TPMT) genotype. IBD patients are at increased risk for the adverse effects of AZA compared with AIH patients, of which leukopenia was the most commonly observed. Therefore, IBD patients receiving AZA therapy should be carefully monitored. (Korean J Gastroenterol 2014;64:348-355).
    The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi 12/2014; 64(6):348-55. DOI:10.4166/kjg.2014.64.6.348
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    ABSTRACT: Irisin is a recently found myokine that aids obesity control and improves glucose homeostasis by acting on white adipose tissue cells and increases total energy consumption. The aim of this study was to evaluate serum irisin levels in patients with non-alcoholic fatty liver disease (NAFLD) and to compare these levels with those of normal controls. Among 595 health screen examinees who had visited our institute between January 2013 to March 2013, 355 patients (84 NAFLD patients and 271 normal controls) were enrolled depending on whether they gave written informed consents and their history of alcohol intake, blood tests, and abdominal ultrasonographic findings. Age; sex; laboratory test parameters; homeostasis model assessment-insulin resistance; and levels of leptin, adiponectin, and irisin were assessed. Serum irisin levels (ng/ml) were significantly higher in the NAFLD group than in normal controls (63.4±32.6 vs. 43.0±29.7, p<0.001) and higher in the mild fatty liver group than in the moderate-to-severe fatty liver group (68.3±38.2 vs. 56.6±21.2, p<0.001). Additionally, serum irisin levels were not different between the non-obese and obese groups (48.4±34.2 vs. 45.8±22.9, p = 0.492); however, the levels were significantly lowest in normal controls and highest in the mild fatty liver group in the non-obese (44.9±31.7 vs. 73.1±48.5 vs 59.7±18.0, p<0.001) and obese groups (35.0±17.0 vs. 62.9±21.2 vs. 54.6±23.3, p<0.001). Serum irisin levels were significantly higher in NAFLD patients, which is not consistent with the results of previously published studies. Therefore, more studies are needed to confirm the role of irisin in NAFLD.
    PLoS ONE 10/2014; 9(10):e110680. DOI:10.1371/journal.pone.0110680 · 3.53 Impact Factor
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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
  • Woo Jin Chung
    The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi 09/2014; 64(3):173-5. DOI:10.4166/kjg.2014.64.3.173
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    ABSTRACT: Only a few studies have evaluated the population-adjusted prevalence of gallbladder polyps (GBP). This study aimed to evaluate the changes in GBP prevalence and risk factors at a single health screening center in Korea from 2002 to 2012. Of 48,591 adults who underwent health screening between 2002 and 2012, 14,250 age- and gender-matched subjects were randomly selected to evaluate prevalence. Risk factors were analyzed between the GBP-positive and GBP-negative groups during 2002-2004 (Period A) and 2010-2012 (Period B). The annual prevalence of GBP over the 11-yr period was 5.4%. Annual prevalence increased from 3.8% in Period A to 7.1% in Period B. Male gender and obesity were independent risk factors for GBP in both periods. Hepatitis B virus surface antigen (HBsAg) positivity was a risk factor for GBP in Period A but not in Period B. The risk factors for GBP changed from HBsAg positivity to lipid profile abnormalities. Other variables including age, hypertension, diabetes, impaired fasting glucose, chronic hepatitis C virus infection, and liver function tests did not correlate with GBP. In conclusion, GBP prevalence is increasing and risk factors for GBP have changed in Korea. More attention should be paid to this issue in the future.
    Journal of Korean Medical Science 09/2014; 29(9):1247-52. DOI:10.3346/jkms.2014.29.9.1247 · 1.25 Impact Factor
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    ABSTRACT: Background The aim of this study was to compare the efficacy of hepatic arterial infusion chemotherapy (HAIC) and sorafenib in advanced hepatocellular carcinoma (HCC) patients with portal vein tumor thrombosis (PVTT). Methods A total of 110 patients were observed between February 2008 and May 2013 in seven Korean centers. Fifty patients were treated with HAIC, and 60 patients were treated with sorafenib. Results The disease control rate in the HAIC was significantly higher than that in the sorafenib group (p p = 0.214). The median overall survival (OS) was significantly longer in the HAIC group than in the sorafenib group (7.1 vs. 5.5 months, p = 0.011). The median time to-progression (TTP) was also significantly longer in the HAIC group than in the sorafenib group (3.3 vs. 2.1 months, p = 0.034). In the multivariate analysis, tumor diameter (≥ 10 cm) and the absence of combined loco-regional treatment were significant prognostic factors influencing OS (p = 0.002 and p = 0.010, respectively) and TTP (p = 0.017 and p = 0.006, respectively). The treatment modality tended to be a significant prognostic factor for survival (p = 0.052), but not for tumor progression (p = 0.121). Conclusions HAIC is comparable with sorafenib in terms of OS and TTP in advanced HCC patients with PVTT. HAIC shows more favorable treatment responses compared with sorafenib. Therefore, HAIC might be an alternative treatment modality to sorafenib in advanced HCC patients with PVTT.
    Journal of Gastroenterology 07/2014; 50(4). DOI:10.1007/s00535-014-0978-3 · 4.02 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: A novel synthetic and processing strategy for converting elemental sulfur into polymeric and nanocomposite materials is reported. We describe a facile one-pot reaction using elemental sulfur and oleylamine as comonomers to prepare high sulfur content copolymers and lead sulfide nanoparticle (PbS NP) nanocomposites. This process enables the preparation of solution processable copolymers and nanocomposites, where the loading and dispersion of PbS NP inclusions could be precisely controlled. We demonstrate the dual roles of oleylamine with sulfur for both the copolymerization of sulfur copolymers as well as the in situ synthesis of PbS NPs in a one-pot fashion.
    05/2014; 5(11). DOI:10.1039/C4PY00073K
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    ABSTRACT: Polymers for IR imaging: The preparation of high refractive index polymers (n = 1.75 to 1.86) via the inverse vulcanization of elemental sulfur is reported. High quality imaging in the near (1.5 μm) and mid-IR (3-5 μm) regions using high refractive index polymeric lenses from these sulfur materials was demonstrated.
    Advanced Materials 05/2014; 26(19). DOI:10.1002/adma.201305607 · 15.41 Impact Factor
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    ABSTRACT: Hepatocellular carcinoma (HCC) is the fourth most common form of cancer in the Korean population, caused primarily by infection with either the Hepatitis B or C virus. Progression of this disease is frequently associated with mutations in either phosphoinositide-3-kinase, catalytic, alpha (PIK3CA) or hepatitis B virus X (HBx) gene. Previous studies have examined the frequency of PIK3CA mutations in HCC, although the clinical significance of these mutations has not been studied in a Korean population. In addition, HBx appears to play a key role in modulating a wide range of cellular functions, leading to HCC. In this study, we examined microdissected tumor samples from 50 HCC patients who underwent hepatectomy at Keimyung University Dongsan Medical Center. These patients were screened for mutations in PIK3CA and HBx to identify the clinical outcomes associated with these mutations. Exons 9 and 20 of PIK3CA and the entirety of HBx were screened for mutations by polymerase chain reaction and direct DNA sequencing. PIK3CA mutations were detected in 7 of 50 patients (14%). Among the 42 patients who were seropositive for hepatitis B, 17 (40.5%) had HBx mutations and 4 (9.52%) had mutations in PIK3CA. PIK3CA mutations were strongly correlated with tumor size. Patients harboring HBx mutations exhibited a longer time to recurrence; this difference was statistically significant not only in comparison with the PIK3CA mutation but also compared with those without any mutations. This result suggests a role for PIK3CA and HBx mutations as prognostic markers in HCC.
    Apmis 03/2014; 122(10). DOI:10.1111/apm.12245 · 1.92 Impact Factor
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    Woo Jin Chung
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    ABSTRACT: A major cause of cirrhosis related morbidity and mortality is the development of variceal bleeding, a direct consequence of portal hypertension. Less common causes of gastrointestinal bleeding are peptic ulcers, malignancy, angiodysplasia, etc. Upper gastrointestinal bleeding has been classified according to the presence of a variceal or non-variceal bleeding. Although non-variceal gastrointestinal bleeding is not common in cirrhotic patients, gastroduodenal ulcers may develop as often as non-cirrhotic patients. Ulcers in cirrhotic patients may be more severe and less frequently associated with chronic intake of non-steroidal anti-inflammatory drugs, and may require more frequently endoscopic treatment. Portal hypertensive gastropathy (PHG) refers to changes in the mucosa of the stomach in patients with portal hypertension. Patients with portal hypertension may experience bleeding from the stomach, and pharmacologic or radiologic interventional procedure may be useful in preventing re-bleeding from PHG. Gastric antral vascular ectasia (GAVE) seems to be different disease entity from PHG, and endoscopic ablation can be the first-line treatment.
    03/2014; 20(1):1-5. DOI:10.3350/cmh.2014.20.1.1
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    ABSTRACT: This retrospective study assessed the clinical outcome of a transjugular intrahepatic portosystemic shunt (TIPS) procedure for managing portal hypertension in Koreans with liver cirrhosis. Between January 2003 and July 2013, 230 patients received a TIPS in 13 university-based hospitals. Of the 229 (99.6%) patients who successfully underwent TIPS placement, 142 received a TIPS for variceal bleeding, 84 for refractory ascites, and 3 for other indications. The follow-up period was 24.9±30.2 months (mean±SD), 74.7% of the stents were covered, and the primary patency rate at the 1-year follow-up was 78.7%. Hemorrhage occurred in 30 (21.1%) patients during follow-up; of these, 28 (93.3%) cases of rebleeding were associated with stent dysfunction. Fifty-four (23.6%) patients developed new hepatic encephalopathy, and most of these patients were successfully managed conservatively. The cumulative survival rates at 1, 6, 12, and 24 months were 87.5%, 75.0%, 66.8%, and 57.5%, respectively. A high Model for End-Stage Liver Disease (MELD) score was significantly associated with the risk of death within the first month after receiving a TIPS (P=0.018). Old age (P<0.001), indication for a TIPS (ascites vs. bleeding, P=0.005), low serum albumin (P<0.001), and high MELD score (P=0.006) were associated with overall mortality. A high MELD score was found to be significantly associated with early and overall mortality rate in TIPS patients. Determining the appropriate indication is warranted to improve survival in these patients.
    03/2014; 20(1):18-27. DOI:10.3350/cmh.2014.20.1.18
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    ABSTRACT: Sulfur-rich copolymers based on poly(sulfur-random-1,3-diisopropenylbenzene) (poly(S-r-DIB)) were synthesized via inverse vulcanization to create cathode materials for lithium–sulfur battery applications. These materials exhibit enhanced capacity retention (1005 mAh/g at 100 cycles) and battery lifetimes over 500 cycles at a C/10 rate. These poly(S-r-DIB) copolymers represent a new class of polymeric electrode materials that exhibit one of the highest charge capacities reported, particularly after extended charge–discharge cycling in Li–S batteries.
    ACS Macro Letters 02/2014; 3(3):229–232. DOI:10.1021/mz400649w · 5.24 Impact Factor
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    ABSTRACT: G protein‐coupled receptor (GPCR) cell signalling cascades are initiated upon binding of a specific agonist ligand to its cell surface receptor. Linking multiple heterologous ligands that simultaneously bind and potentially link different receptors on the cell surface is a unique approach to modulate cell responses. Moreover, if the target receptors are selected based on analysis of cell‐specific expression of a receptor combination, then the linked binding elements might provide enhanced specificity of targeting the cell type of interest, that is, only to cells that express the complementary receptors. Two receptors whose expression is relatively specific (in combination) to insulin‐secreting pancreatic β‐cells are the sulfonylurea‐1 (SUR1) and the glucagon‐like peptide‐1 (GLP‐1) receptors. A heterobivalent ligand was assembled from the active fragment of GLP‐1 (7–36 GLP‐1) and glibenclamide, a small organic ligand for SUR1. The synthetic construct was labelled with Cy5 or europium chelated in DTPA to evaluate binding to β‐cells, by using fluorescence microscopy or time‐resolved saturation and competition binding assays, respectively. Once the ligand binds to β‐cells, it is rapidly capped and presumably removed from the cell surface by endocytosis. The bivalent ligand had an affinity approximately fivefold higher than monomeric europium‐labelled GLP‐1, likely a result of cooperative binding to the complementary receptors on the βTC3 cells. The high‐affinity binding was lost in the presence of either unlabelled monomer, thus demonstrating that interaction with both receptors is required for the enhanced binding at low concentrations. Importantly, bivalent enhancement was accomplished in a cell system with physiological levels of expression of the complementary receptors, thus indicating that this approach might be applicable for β‐cell targeting in vivo.
    ChemBioChem 01/2014; 15(1). DOI:10.1002/cbic.201300375 · 3.06 Impact Factor

Publication Stats

564 Citations
267.69 Total Impact Points


  • 2009–2015
    • The University of Arizona
      • Department of Chemistry and Biochemistry (College of Science)
      Tucson, Arizona, United States
  • 2005–2015
    • Keimyung University
      • Dongsan Medical Center
      Sŏul, Seoul, South Korea
  • 2013
    • Catholic University of Korea
      • Department of Pediatrics
      Sŏul, Seoul, South Korea
  • 2011
    • University of Nebraska at Lincoln
      • Department of Chemistry
      Lincoln, Nebraska, United States
  • 2010
    • Harvard University
      Cambridge, Massachusetts, United States
  • 2003–2010
    • Yonsei University
      • • Department of Chemistry
      • • Department of Health Policy and Management
      • • Graduate School of Public Health
      Sŏul, Seoul, South Korea
  • 2002–2010
    • Albany State University
      • Division of Chemistry
      Georgia, United States
  • 2007
    • Hebrew University of Jerusalem
      Yerushalayim, Jerusalem District, Israel
  • 2001
    • University at Albany, The State University of New York
      • Department of Chemistry
      New York, New York, United States