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Eun-Do Kim,Jin-Kwon Lee,Jin-Kyu Cho,Jae-Myung Kim,Ji-Ho Park,Ju-Yeon Kim,Sang-Ho Jeong,Young-Tae Ju,Chi-Young Jeong,Eun-Jung Jung,Young-Joon Lee1,Soon-Chan Hong,곽승진 대한종양외과학회 2019 Korean Journal of Clinical Oncology Vol.15 No.2
Purpose: Whether subtotal or total colectomy with primary anastomosis (PA) is safer than Hartmann procedure (HP) for left-sided colon cancer obstruction or perforation remains controversial. The purpose of this study was to compare postoperative morbidity, mortality, and defecation frequency between PA and HP for left-sided colon cancer obstruction or perforation. Methods: This retrospective study enrolled 54 patients from January 2014 to February 2018 who underwent emergency surgery due to left-sided colon cancer obstruction or perforation. Results: PA was carried out in 20 patients while HP was performed for 34 patients. Thirty-day mortality did not show significant difference between the two groups (15.0% vs. 14.7%, P=1.000). No anastomotic leakage occurred in PA group while three (8.8%) cases of stump leakage occurred in HP group. Stoma repair was performed for 13 cases (44.8%) and stoma reformation was performed for one case in HP group (7.7%). Stoma related complications occurred in five cases (17.24%). For patients after stoma repair, defecation frequency at 3 months after operation was 2.91±2.88 times per day in PA group and 2.86±2.63 times per day in HP group. At 1 year after operation, defecation frequency was changed to 1.40±1.12 times per day in PA group and 1.17±0.39 times per day in HP group. Conclusion: Primary ileosigmoid or ileorectal anastomosis for left-sided colon cancer obstruction or perforation is safe, and shows similar outcome of defecation frequency compared to H
Clinical and Genetic Characteristics of Retinal Capillary Hemangioblastoma in Korean Patients
Sang Ha Lee(Sang Ha Lee),Kyu Hyung Park(Kyu Hyung Park),Se Joon Woo(Se Joon Woo),Sang Jun Park(Sang Jun Park),Kwangsic Joo(Kwangsic Joo) 대한안과학회 2022 Korean Journal of Ophthalmology Vol.36 No.6
Purpose: We investigated the clinical features of Korean patients with retinal capillary hemangioblastoma (RCH) and genetic variants of the von Hippel-Lindau (VHL) gene. Methods: A retrospective analysis was performed on patients with RCH from 2003 to 2021 at Seoul National University Bundang Hospital. Sporadic and hereditary RCH associated with VHL disease were classified based on the specific tumors and family history. Clinical features, including the location and number of RCH and bilateral involvement, were investigated. Multiplex ligation-dependent probe amplification and direct sequencing targeting the VHL gene were performed for six RCH cases associated with VHL disease. Results: A total of 18 patients (23 eyes) were enrolled in this study. The mean age at diagnosis was 37 ± 15 years. Twelve patients had hereditary RCH associated with VHL disease, and six patients had sporadic RCH. All five patients with bilateral RCH were clinically diagnosed with VHL disease, and 13 patients had unilateral RCH. Juxtapapillary RCH was only observed in patients with VHL. The most common complication of RCH was the epiretinal membrane, followed by the subretinal fluid. Pathogenic variants were identified in four patients. All three patients with type 1 VHL had the well-known missense mutation p.Glu70Lys, and one patient with type 2 VHL had the nonsense mutation p.Trp88Ter. Conclusions: In Korean patients with RCH, bilateral involvement and juxtapapillary RCH are highly likely to be associated with VHL disease. Because RCH may be the first clinical manifestation in patients with VHL, active genetic testing of the VHL gene and systemic evaluation are required.
한국형발사체 3단 과산화수소 추력기시스템 제어장치 아날로그 데이터 취득 스케줄링 변경을 통한 노이즈 측정오류 개선
이상현(Sang-Hyun Lee),송우근(Woo-Keun Song),오현명(Hyun-Myung Oh),이정운(Jung-Un Lee),이종철(Jong-Cheol Lee),박상준(Sang-Joon Park),이상빈(Sang-Bin Lee),이희중(Hee-Joong Lee),오상관(Sang-Gwan Oh),민병주(Byeong-Joo Min) 한국항공우주학회 2020 한국항공우주학회 학술발표회 논문집 Vol.2020 No.11
Lee, Sung-Sahn,So, Sang-Yeon,Jung, Eui-Yub,Kim, Hyun-Jun,Lee, Byung Hoon,Wang, Joon Ho Elsevier 2019 Arthroscopy Vol.35 No.6
<P><B>Purpose</B></P> <P>To identify risk factors for patellofemoral degenerative progression after opening-wedge high tibial osteotomy (HTO) and to investigate the effect of patellofemoral degeneration on the patellofemoral specific patient-reported outcomes.</P> <P><B>Methods</B></P> <P>Between March 2010 and June 2016, 94 knees (86 patients) underwent hardware removal with second-look arthroscopy at 21.4 months after opening-wedge HTO with first-look arthroscopy (mean follow-up duration, 49.8 months). Predictive factors for patellofemoral degeneration, including demographics, preoperative and postoperative mechanical axis (MA) of the lower limb (positive and negative MA indicating varus and valgus, respectively), tibial slope, and modified Blackburne-Peel ratio, were evaluated. Patients were divided into the progression and nonprogression groups according to their patellofemoral degenerative progression from first to second arthroscopy. Clinical outcomes, including the Kujala score and Knee Injury and Osteoarthritis Outcome Score, and radiographic outcomes were compared between the 2 groups.</P> <P><B>Results</B></P> <P>Postoperative MA (adjusted odd ratio, 0.62; <I>P</I> < .001) was the most significant predictive factor for progressive change in the patellofemoral joint (<I>R</I> <SUB>n</SUB> <SUP>2</SUP> = 0.31). Twenty-eight knees (30%) showed patellofemoral degenerative progression. Mean postoperative Kujala score (progression group 60.5 vs nonprogression group, 72.3; <I>P</I> = .005) and Knee Injury and Osteoarthritis Outcome Score scales (except for the symptom subscale) were lower in the progression group. Postoperative MA was significantly more corrected in the progression group (progression group –5.1° ± 2.7° vs nonprogression group –2.4° ± 2.3°; <I>P</I> < .001).</P> <P><B>Conclusions</B></P> <P>Postoperative MA, which might be related to overcorrection, is correlated with patellofemoral degenerative progression after opening-wedge HTO. Patients with patellofemoral degenerative progression showed inferior patient-reported outcomes.</P> <P><B>Level of Evidence</B></P> <P>Level IV, case series with subgroup analysis.</P>
Lee, Jae Hyun,Yang, Joon Seon,Lee, Sang-Hak,Moon, Myeong Hee Elsevier 2018 Journal of chromatography. B, Analytical technolog Vol.1099 No.-
<P><B>Abstract</B></P> <P>A comprehensive lipid analysis was performed at the plasma lipoprotein level in patients with acute coronary syndrome (ACS) and stable coronary artery disease (CAD). Because the lipids in lipoproteins are related to the pathology of the cardiovascular system, lipoprotein-specific lipid analysis can be useful for understanding the mechanism of lipid-associated cardiovascular diseases. Lipoproteins were size-sorted into high density lipoproteins (HDL) and low density lipoproteins (LDL) using asymmetrical flow field-flow fractionation, then lipids of each lipoprotein were analysed using nanoflow ultrahigh performance liquid chromatography-electrospray ionization-tandem mass spectrometry. A total of 365 lipids were structurally identified and quantified by selected reaction monitoring method. Two high abundance lysophosphatidylcholines (16:0 and 18:0) were significantly increased only in the HDL of the ACS group (vs. the stable CAD group). Phosphatidylethanolamines (38:5 and 40:5) significantly increased in ACS by >2-fold in both lipoproteins. (18:0, 22:6)-diacylglycerol increased in ACS by 3.5-fold only in LDL; however, most high abundance triacylglycerols decreased 2-fold in both lipoproteins. The present study revealed the usefulness of lipoprotein-specific analysis of lipids in distinguishing ACS from stable CAD, and the selected lipids analysed in this study may be useful in the development of lipid markers for the early detection of ACS.</P>
Lignin for white natural sunscreens
Lee, Sang Cheon,Tran, Thi Minh Thu,Choi, Joon Weon,Won, Keehoon Elsevier 2019 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.122 No.-
<P><B>Abstract</B></P> <P>Long-time exposure to the sun's ultraviolet (UV) radiation is harmful and causes various skin problems. Natural sun blockers have been drawing considerable attention recently. Even though lignin, an abundant aromatic polymer from plants, is a natural UV screening agent, its unfavorable dark color hinders its high value-added applications in sunscreens and cosmetics. In this study, we separate lignin under mild conditions (at room temperature with neutral solvents) in order to prevent darkening occurring during delignification and apply the resultant lignin as a natural sunscreen ingredient for the first time. Lignins isolated from <I>Miscanthus sacchariflorus</I> (MWL-M) and from <I>Pinus densiflora</I> (MWL-P) are compared with organosolv lignin (OL), which showed the best sunscreen performance, in color and UV protection. MWLs separated under mild conditions were light in color unlike conventional lignins extracted under harsh conditions. UV absorption of light-colored MWL-M was revealed to be as high as dark-colored OL. MWLs also showed synergistic effects with a commercial sunscreen; exposure of the MWL-added sunscreen to UVA radiation greatly enhanced the sun protection factor (SPF) value of the sunscreen.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Retrospective analysis of culture-negative versus culture-positive postoperative spinal infections
Lee, Jae Chul,Baek, Min Jung,Choi, Sung-Woo,Kwon, Soon Hyo,Kim, Kwang-Hyun,Park, Se Yoon,Kim, Tae Hyong,Park, Suyeon,Jang, Hae-Dong,Chun, Dong-Il,Shin, Byung-Joon Williams & Wilkins Co 2018 Medicine Vol.97 No.20
<P><B>Abstract</B></P><P>Retrospective analysis.</P><P>This study aimed to investigate the characteristics, clinical features, and outcomes of culture-negative (CN) and culture-positive (CP) postoperative spinal infections (PSIs).</P><P>Causative organism cultures and the use of adequate antibiotics are essential for treating postoperative spinal wound infections. However, managing infected surgical sites with negative wound culture results is a common clinical problem. Although the outcomes of microbiologically confirmed PSIs have been well studied, the outcomes and clinical characteristics of CN PSIs have not been previously published.</P><P>Between January 1995 and December 2014, 69 patients diagnosed with PSIs were enrolled. Enrolled patients were classified into 2 groups: CN (28 patients) and CP (41 patients). Baseline data, clinical manifestations, specific treatments, and treatment outcomes were compared with the groups.</P><P>The overall rate of CN PSI was 40.6% (28/69). Baseline data and clinical manifestations were similar between the 2 groups. There were no significant differences in the duration of parenteral antibiotic use between the CN and CP groups. Revision surgery was required less often for the CN group (64.3%) than for the CP group (87.8%) (<I>P</I> = .020). Revision surgeries were repeated 0.82 times/case in the CN group and 1.34 times/case in the CP group (<I>P</I> = .014). Treatment outcomes, such as poor radiologic findings, need for additional anterior surgery, extension of fusion to adjacent segment surgery, and total length of hospital stay, were not different between groups.</P><P>Revision surgery was performed less often for the CN group than for the CP group. From the perspective of revision surgery, CN PSIs have better prognosis than CP PSIs. However, clinical presentations and radiologic prognoses were not different between the two groups. We suggest that CN PSIs may be treated in the same way as CP PSIs.</P>
Analysis of Fifty Hotspot Mutations of Lung Squamous Cell Carcinoma in Never-smokers
Lee, Ha Youn,Lee, Se-Hoon,Won, Jae-Kyung,Lee, Dong Soo,Kwon, Nak-Jung,Choi, Sun Mi,Lee, Jinwoo,Lee, Chang-Hoon,Lee, Sang-Min,Yim, Jae-Joon,Yoo, Chul-Gyu,Kim, Young Whan,Han, Sung Koo,Park, Young Sik KOREAN ACADEMY OF MEDICAL SCIENCE 2017 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.32 No.3
<P>Smoking is the major risk factor for lung squamous cell carcinoma (SCC), although a small number of lung SCCs occurs in never-smokers. The purpose of this study was to compare 50 hotspot mutations of lung SCCs between never-smokers and smokers. We retrospectively reviewed the medical records of patients newly diagnosed with lung SCC between January 1, 2011 and December 31, 2013 in the Seoul National University Hospital. Formalin-fixed, paraffin-embedded tumor samples were used for analysis of hotspot mutations. Fifty cancer-related genes in never-smokers were compared to those in ever-smokers. Of 379 lung SCC patients, 19 (5.0%) were never-smokers. The median age of these 19 patients was 67 years (interquartile range 57–73 years), and 10 of these patients were women (52.5%). The incidence rates of stage I, II, III, and IV disease in this group were 26.4%, 5.3%, 31.6%, and 36.8%, respectively, and sequencing was performed successfully in 14 cases. In the 26 lung SCC tumor samples (12 from never-smokers and 14 from ever-smokers) sequenced using personal genome machine, the most common mutations were in <I>TP53</I> (75.0%), <I>RAS</I> (66.7%), and <I>STK11</I> (33.3%), but mutations were also found in <I>EGFR</I>, <I>KIT</I>, and <I>PTEN</I>. The distribution of hotspot mutations in never-smokers was similar to that in ever-smokers. There was no significant difference in overall survival between the 2 groups. The 50 hotspot mutations of lung SCC in never-smokers were similar to those of ever-smokers.</P>