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Won J, Choi S, Chun S, Kim H. Abstract No. 521 Robot-assisted transarterial chemoembolization using “operation bed mounted master-slave robot system” for the treatment of hepatocellular carcinoma: pilot study to evaluate the safety and efficiency. J Vasc Interv Radiol 2022. [DOI: 10.1016/j.jvir.2022.03.503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Shin E, Lee E, Hong J, Kim H, Lee W, Chun S, Min W. W250 Accuracy evaluation of automated electrochemiluminescence immunoassay for everolimus and sirolimus compared to liquid chromatography-tandem mass spectrometry. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Hong J, Gu H, Chun S, Kim M, Sofianidis A, Klopprogge K. M041 Comparability of selected assays on COBAS pure integrated solutions under routine-like conditions. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Hong J, Cho E, Kim H, Lee W, Chun S, Min W. M104 Application and modification of reference change values for delta checks in clinical laboratory. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Shin Y, Shin E, Hong J, Kim H, Lee W, Chun S, Min W. M246 Estimated mean recovery of two LDL cholesterol homogeneous methods by non-HDL particle size distribution. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Kim S, Hong H, Hong J, Kim H, Lee W, Chun S, Min W. M109 Monitoring of the proportion of unacceptable specimen for laboratory quality improvement. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Hong H, Lee E, Hong J, Kim H, Lee W, Chun S, Min W. T115 Hematocrit is a predictive marker for inaccurate interpretation of arterial blood gas analysis caused by inadequate sample mixing. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Shin JH, Kim SH, Lee D, Lee SY, Chun S, Lee JH, Won EJ, Choi HJ, Choi HW, Kee SJ, Shin MG, Shin JH. Performance Evaluation of VITEK MS for the Identification of a Wide Spectrum of Clinically Relevant Filamentous Fungi Using a Korean Collection. Ann Lab Med 2021; 41:214-220. [PMID: 33063683 PMCID: PMC7591280 DOI: 10.3343/alm.2021.41.2.214] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 04/25/2020] [Accepted: 09/19/2020] [Indexed: 11/28/2022] Open
Abstract
The correct identification of filamentous fungi is challenging. We evaluated the performance of the VITEK MS v3.0 system (bioMérieux, Marcy-l’Étoile, France) for the identification of a wide spectrum of clinically relevant filamentous fungi using a Korean collection. Strains that were added to the upgraded v3.2 database were additionally identified by the VITEK MS v3.2 system. Of the 105 tested isolates, including 37 Aspergillus (nine species), 41 dermatophytes (seven species), and 27 other molds (17 species), 43 (41.0%) showed “no identification” or “multiple species identification” results at the initial VITEK MS testing; these isolates were retested using the same method. Compared with sequence-based identification, the correct identification rate using VITEK MS for Aspergillus, dermatophytes, other molds, and total mold isolates was 67.6%, 56.1%, 48.1%, and 58.1% at the initial testing and 94.6%, 78.0%, 55.6%, and 78.1% with retesting, respectively. Following retesting, 19 (18.1%) and two (1.9%) isolates showed “no identification” and “misidentification” results, respectively. VITEK MS reliably identified various filamentous fungi recovered in Korea, with a very low rate of misidentification.
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Affiliation(s)
- Ju Hyeon Shin
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Soo Hyun Kim
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Korea.,Department of Microbiology, Chonnam National University Medical School, Hwasun, Korea
| | - Dain Lee
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Seung Yeob Lee
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Jun Hyung Lee
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Eun Jeong Won
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Korea.,Department of Parasitology and Tropical Medicine, Chonnam National University Medical School, Hwasun, Korea
| | - Hyun Jung Choi
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Hyun Woo Choi
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Seung Jung Kee
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Myung Geun Shin
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Jong Hee Shin
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Korea
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Lam W, Wong A, Chun S, Wong T, Hung W, Lie H, Tsang C, Ho B, Ng A, Tsu J. Prostate cancer detection, tolerability and safety of transperineal prostate biopsy under local-anaesthesia versus standard transrectal biopsy in biopsy-naïve men: A pragmatic, parallel group, randomized-controlled study. Eur Urol 2021. [DOI: 10.1016/s0302-2838(21)01372-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Yun JW, Lee S, Chun S, Lee KW, Kim J, Kim HS. Comprehensive analysis of oncogenic signatures and consequent repurposed drugs in TMPRSS2:ERG fusion-positive prostate cancer. Clin Transl Med 2021; 11:e420. [PMID: 34047472 PMCID: PMC8120022 DOI: 10.1002/ctm2.420] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 04/23/2021] [Accepted: 04/30/2021] [Indexed: 12/25/2022] Open
Affiliation(s)
- Jae Won Yun
- Veterans Health Service Medical Center, Veterans Medical Research Institute, Seoul, Korea
| | - Sejoon Lee
- Precision Medicine Center, Seoul National University Bundang Hospital, Seongnam, South Korea.,Department of Pathology and Translational Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Medical School and Hospital, Gwangju, Korea
| | - Kwang Woo Lee
- School of Medicine, University of Queensland, Brisbane, Australia
| | - Jongsu Kim
- Department of Biological Sciences, Sungkyunkwan University, Suwon, Korea
| | - Hong Sook Kim
- Department of Biological Sciences, Sungkyunkwan University, Suwon, Korea
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Kim JE, Chun S, Sinn DH, Kim NJ, Kim S, Kang W, Kim JM, Choi GS, Joh JW, Cho D. Initial experience with high-volume plasma exchange in patients with acute liver failure. J Clin Apher 2021; 36:379-389. [PMID: 33400840 DOI: 10.1002/jca.21873] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 12/24/2020] [Accepted: 12/27/2020] [Indexed: 12/21/2022]
Abstract
BACKGROUND/AIMS High-volume plasma exchange (HVPE), defined as an exchange of 8 to 12 L per day per procedure or 15% of the ideal body weight with fresh frozen plasma, has shown promising results in improving the survival of patients with acute liver failure (ALF). However, clinical evidence is limited. The aim of this study was to report our initial experience using HVPE as a bridge treatment in patients with ALF. METHODS We retrospectively reviewed 32 consecutive patients awaiting liver transplantation (LT) due to ALF between 2013 and 2020 at Samsung Medical Center in Korea. HVPE has been used for patients with ALF since May 2016 at our institution. RESULTS During the study period, 16 patients received HVPE. After HVPE, coagulopathies (INR, 4.46 [2.32-6.02] vs 1.48 [1.33-1.76], P < .05), total bilirubin (22.6 [9.1-26.4] vs 8.9 [5.6-11.3], P < .05), alanine aminotransferase (506 [341-1963] vs 120 [88-315], P < .05), and ammonia levels (130.6 [123.7-143.8] vs 98.2 [84.2-116.5], P < .05) were improved. Improvement in the hepatic encephalopathy grade was observed in four patients. Among 16 patients who received HVPE, 12 patients were bridged to LT, and three patients recovered spontaneously. The overall survival was 94% and 69%, respectively at 30 days in patients who received and did not receive HVPE (P = .068). Among 18 patients with high chronic liver failure-sequential organ failure assessment scores (≥13), the overall survival was significantly better for those who received HVPE than for those who did not (91% vs 29%, respectively, at 30 days, P < .05). CONCLUSIONS Our initial clinical experience with HVPE suggests that HVPE can be a viable option in improving the outcomes of patients presenting with ALF.
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Affiliation(s)
- Ji Eun Kim
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Medical School & Hospital, Gwangju, South Korea
| | - Dong Hyun Sinn
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | | | - Semi Kim
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Wonseok Kang
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Jong Man Kim
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Gyu-Seong Choi
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Jae-Won Joh
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Duck Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
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Lin J, Li S, Pezzi T, Mohamed A, Fuller C, Chen A, Minsky B, Schwartz D, Hernandez B, Chun S. CP01.06 Veterans Affairs Insurance Disparities for Metastatic Lung Cancer in the Hawaiian Islands. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2020.10.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Choi HW, Kwon YJ, Park JH, Lee SY, Chun S, Won EJ, Lee JH, Choi HJ, Kim SH, Shin MG, Shin JH, Kee SJ. Evaluation of a Fully Automated Antinuclear Antibody Indirect Immunofluorescence Assay in Routine Use. Front Immunol 2020; 11:607541. [PMID: 33343581 PMCID: PMC7746920 DOI: 10.3389/fimmu.2020.607541] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Accepted: 11/04/2020] [Indexed: 11/13/2022] Open
Abstract
Indirect immunofluorescence assay (IFA) using HEp-2 cells as a substrate is the gold standard for detecting antinuclear antibodies (ANA) in patient serum. However, the ANA IFA has labor-intensive nature of the procedure and lacks adequate standardization. To overcome these drawbacks, the automation has been developed and implemented to the clinical laboratory. The purposes of this study were to evaluate the analytical performance of a fully automated Helios ANA IFA analyzer in a real-life laboratory setting, and to compare the time and the cost of ANA IFA testing before and after adopting the Helios system. A total of 3,276 consecutive serum samples were analyzed for ANA using the Helios system from May to August 2019. The positive/negative results, staining patterns, and endpoint titers were compared between Helios and visual readings. Furthermore, the turnaround time and the number of wells used were compared before and after the introduction of Helios system. Of the 3,276 samples tested, 748 were positive and 2,528 were negative based on visual readings. Using visual reading as the reference standard, the overall relative sensitivity, relative specificity, and concordance of Helios reading were 73.3, 99.4, and 93.4% (κ = 0.80), respectively. For pattern recognition, the overall agreement was 70.1% (298/425) for single patterns, and 72.4% (89/123) for mixed patterns. For titration, there was an agreement of 75.9% (211/278) between automated and classical endpoint titers by regarding within ± one titer difference as acceptable. Helios significantly shortened the median turnaround time from 100.6 to 55.7 h (P < 0.0001). Furthermore, routine use of the system reduced the average number of wells used per test from 4 to 1.5. Helios shows good agreement in distinguishing between positive and negative results. However, it still has limitations in positive/negative discrimination, pattern recognition, and endpoint titer prediction, requiring additional validation of results by human observers. Helios provides significant advantages in routine laboratory ANA IFA work in terms of labor, time, and cost savings. We hope that upgrading and developing softwares with more reliable capabilities will allow automated ANA IFA analyzers to be fully integrated into the routine operations of the clinical laboratory.
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Affiliation(s)
- Hyun-Woo Choi
- Department of Laboratory Medicine, Chonnam National University Bitgoeul Hospital, Gwangju, South Korea
| | - Yong Jun Kwon
- Department of Laboratory Medicine, Chonnam National University Hospital, Gwangju, South Korea
| | - Ju-Heon Park
- Department of Laboratory Medicine, Chonnam National University Hwasun Hospital, Hwasun, South Korea
| | - Seung-Yeob Lee
- Department of Laboratory Medicine, Chonnam National University Hospital, Gwangju, South Korea
| | - Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Hospital, Gwangju, South Korea.,Department of Laboratory Medicine, Chonnam National University Medical School, Gwangju, South Korea
| | - Eun Jeong Won
- Department of Laboratory Medicine, Chonnam National University Hwasun Hospital, Hwasun, South Korea.,Department of Parasitology and Tropical Medicine, Chonnam National University Medical School, Gwangju, South Korea
| | - Jun Hyung Lee
- Department of Laboratory Medicine, Chonnam National University Hwasun Hospital, Hwasun, South Korea
| | - Hyun-Jung Choi
- Department of Laboratory Medicine, Chonnam National University Hospital, Gwangju, South Korea.,Department of Laboratory Medicine, Chonnam National University Medical School, Gwangju, South Korea
| | - Soo Hyun Kim
- Department of Laboratory Medicine, Chonnam National University Hwasun Hospital, Hwasun, South Korea.,Department of Microbiology, Chonnam National University Medical School, Gwangju, South Korea
| | - Myung-Geun Shin
- Department of Laboratory Medicine, Chonnam National University Hwasun Hospital, Hwasun, South Korea.,Department of Laboratory Medicine, Chonnam National University Medical School, Gwangju, South Korea
| | - Jong-Hee Shin
- Department of Laboratory Medicine, Chonnam National University Hospital, Gwangju, South Korea.,Department of Laboratory Medicine, Chonnam National University Medical School, Gwangju, South Korea
| | - Seung-Jung Kee
- Department of Laboratory Medicine, Chonnam National University Hospital, Gwangju, South Korea.,Department of Laboratory Medicine, Chonnam National University Medical School, Gwangju, South Korea
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Chun S, Kim H, Yun JW, Yu H, Seo JY, Cho D. RHD genotyping is recommended for all patients with serological weak-D phenotypes in Asian populations – Cases with coexistence of weak-D and Asia type DEL alleles results in complete expression of D-antigen. Transfus Apher Sci 2020; 59:102807. [DOI: 10.1016/j.transci.2020.102807] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 04/08/2020] [Accepted: 04/19/2020] [Indexed: 11/25/2022]
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Hung W, Chun S, Wong T, Tsang C, Ho B, Ng A, Tsu H, Lam W. Transrectal vs. transperineal prostate biopsy under local anaesthesia: Prospective comparative analysis of cancer detection, safety and tolerability using patient-reported outcome measures at a single centre. EUR UROL SUPPL 2020. [DOI: 10.1016/s2666-1683(20)34175-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Chun S, Lee HJ, Cho D. A new RHD variant allele (RHD Gly339Val) shows weakened D expression compared to RHD Gly339Glu and Gly339Arg mutants. Transfusion 2020; 60:E17-E18. [PMID: 32510605 DOI: 10.1111/trf.15908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 04/07/2020] [Accepted: 04/17/2020] [Indexed: 11/27/2022]
Affiliation(s)
- Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Medical School and Hospital, Gwangju, South Korea
| | - Ho-Jin Lee
- Department of Natural Sciences, Southwest Tennessee Community College, Memphis, Tennessee, USA
| | - Duck Cho
- Department of Laboratory Medicine & Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
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Chun S, Phan MTT, Hong S, Yang J, Yoon Y, Han S, Kang J, Yazer MH, Kim J, Cho D. Double-filtered leukoreduction as a method for risk reduction of transfusion-associated graft-versus-host disease. PLoS One 2020; 15:e0229724. [PMID: 32214402 PMCID: PMC7098637 DOI: 10.1371/journal.pone.0229724] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Accepted: 02/13/2020] [Indexed: 11/20/2022] Open
Abstract
Background Transfusion-associated graft-versus-host disease (TA-GvHD) is caused by leukocytes, specifically T cells within a transfused blood product. Currently, the prevention of transfusion-associated graft-versus-host disease is performed by irradiation of blood products. With a sufficient reduction of leukocytes, the risk for TA-GvHD can be decreased. With consistent advances in current state-of-the-art blood filters, we herein propose that double filtration can sufficiently reduce leukocytes to reduce the risk for TA-GvHD. Materials Thirty RBC concentrates were filtered with leukocyte filters, followed by storage at 1–6 oC for 72 hours, and then a second filtration was performed. Residual leukocytes in the double-filtered RBC units (n = 30) were assessed with flow cytometric methods, and an additional assay with isolated peripheral blood mononuclear cells (PBMCs) (n = 6) was done by both flow cytometric methods and an automated hematology analyzer. Quality of the RBCs after filtration was evaluated by hematological and biochemical tests. In vitro T cell expansion was performed using anti-CD3/CD28-coated Dynabeads or anti-CD3 (OKT3). In vivo experiment for GvHD was performed by using NOD.Cg-Prkdcscid Il2rgtm1Wjl/SzJ (NSG) mice. Results Double-filtered blood products showed residual leukocyte levels below detection limits, which calculated to be below 1200–2500 cells per blood unit. In vitro expansion rate of T cells showed that 6x103 and 1x103 cell-seeded specimens showed 60.8±10.6 fold and 10.2±9.7-fold expansion, respectively. Cell expansion was not sufficiently observed in wells planted with 1x102 or 10 cells. In vivo experiments showed that mice injected with 1x105 or more cells cause fatal GvHD. GvHD induced inflammation was observed in mice injected with 1x104 or more cells. No evidence of GvHD was found in mice injected with 103 cells. Conclusions Our study suggests that additional removal of contaminating lymphocytes by a second leukodepletion step may further reduce the risk for TA-GvHD.
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Affiliation(s)
- Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Medical School & Hospital, Gwangju, Korea
| | - Minh-Trang Thi Phan
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunwan University School of Medicine, Seoul, Korea
| | - Saetbyul Hong
- Animal Research and Molecular Imaging Center, Samsung Medical Center, Seoul, Korea
| | - Jehoon Yang
- Animal Research and Molecular Imaging Center, Samsung Medical Center, Seoul, Korea
| | - Yeup Yoon
- Animal Research and Molecular Imaging Center, Samsung Medical Center, Seoul, Korea
- Samsung Advanced Institute for Health Sciences & Technology, Sungkyunwan University School of Medicine, Seoul, Korea
| | - Sangbin Han
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jungwon Kang
- Blood Transfusion Research Institute, Korean Red Cross, Wonju, Korea
| | - Mark H. Yazer
- Department of Pathology, University of Pittsburgh, Pittsburgh, PA, United States of America
| | - Jaehyun Kim
- Blood Transfusion Research Institute, Korean Red Cross, Wonju, Korea
- * E-mail: (DC); (JK)
| | - Duck Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunwan University School of Medicine, Seoul, Korea
- Samsung Advanced Institute for Health Sciences & Technology, Sungkyunwan University School of Medicine, Seoul, Korea
- * E-mail: (DC); (JK)
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Lee HS, Kee SJ, Shin JH, Kwon YS, Chun S, Lee JH, Won EJ, Choi HJ, Kim SH, Shin MG, Shin JH, Suh SP. Xpert MTB/RIF Assay as a Substitute for Smear Microscopy in an Intermediate-Burden Setting. Am J Respir Crit Care Med 2020; 199:784-794. [PMID: 30252496 DOI: 10.1164/rccm.201804-0654oc] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
RATIONALE Use of Xpert MTB/RIF assay as a substitute for smear microscopy in routine clinical practice remains unexplored in an intermediate-tuberculosis-burden setting. OBJECTIVES To compare the diagnostic performance of Xpert and smear microscopy, based on sampling time and location, correlation of Xpert semiquantitative category with smear grade and time to culture positivity, and compliance of reporting time with defined standard time. METHODS Consecutive sputum samples collected from 2,952 suspected pulmonary tuberculosis patients over a 3-year period were tested by Xpert, smear microscopy, and liquid culture as part of routine diagnostics in South Korea. MEASUREMENTS AND MAIN RESULTS Based on the analysis of a single sputum specimen per patient, of 2,952 samples, 263 (8.9%) were culture-confirmed tuberculosis and 265 (9.0%) were nontuberculous mycobacteria. The overall sensitivity and specificity were 74.1% and 97.5% for Xpert versus 38.8% and 96.7% for smear microscopy, respectively (P < 0.0001; P > 0.05). Of 82 smear-positive nontuberculous mycobacteria, 81 (98.8%) were accurately excluded by Xpert. Sampling time and location significantly affected the performance of smear microscopy but not that of Xpert. Xpert semiquantitative category strongly correlated with smear grade (γGoodman-Kruskal = 0.982; P < 0.0001) and time to culture positivity (γGoodman-Kruskal = -0.962; P < 0.0001). Median reporting time and its compliance rate within 24 hours were 3.1 hours and 96.3% for Xpert versus 19.1 hours and 88.7% for smear microscopy, respectively (P < 0.0001; P < 0.05). CONCLUSIONS Xpert provides faster, more stable, and superior results compared with smear microscopy, in addition to its strong correlation with smear grade. Xpert might replace smear microscopy as the first-line diagnostic test for pulmonary tuberculosis in routine clinical practice in an intermediate-burden setting.
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Affiliation(s)
- Hyun-Seung Lee
- 1 Department of Laboratory Medicine, Chonbuk National University Hospital, Jeonju, Republic of Korea
| | | | | | - Yong-Soo Kwon
- 3 Department of Pulmonary and Critical Care Medicine, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | | | - Jun Hyung Lee
- 4 Department of Laboratory Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun, Republic of Korea; and
| | - Eun Jeong Won
- 2 Department of Laboratory Medicine and.,5 Department of Parasitology, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Hyun-Jung Choi
- 4 Department of Laboratory Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun, Republic of Korea; and
| | - Soo Hyun Kim
- 4 Department of Laboratory Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun, Republic of Korea; and
| | - Myung-Geun Shin
- 4 Department of Laboratory Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun, Republic of Korea; and
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Chun S, Pezzi T, Schwartz D, Pisters K, Mohamed A, Welsh J, Chang J, Liao Z, Gandhi S, Byers L, Minsky B, Hahn S, Fuller C. PD01.20 Medicaid Outcome Inequalities in Small Cell Lung Cancer. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.09.056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Park J, Shin D, Han K, Chun S. Association between kidney function, proteinuria and the risk of kidney cancer: A nationwide cohort study involving 10 million participants. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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Chun S, Liao Z, Jeter M, Chang J, Lin S, Komaki R, Guerrero T, Mayo R, Korah B, Koshy S, Heymach J, Koong A, Skinner H. P1.20 Metabolic Responses to Metformin in Early-Stage NSCLC Treated with Definitive Radiotherapy: Results of a Phase II Trial. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.09.077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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22
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Chun S, Kang CI, Kim YJ, Lee NY. Clinical Significance of Isolates Known to Be Blood Culture Contaminants in Pediatric Patients. ACTA ACUST UNITED AC 2019; 55:medicina55100696. [PMID: 31627324 PMCID: PMC6843289 DOI: 10.3390/medicina55100696] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 09/26/2019] [Accepted: 10/15/2019] [Indexed: 11/30/2022]
Abstract
Background and objectives: The objective of this study was to investigate the clinical significance of isolates from blood stream infection known to be blood culture contaminants in pediatric patients. Materials and Methods: Microbiological reports and medical records of all blood culture tests issued from 2002 to 2012 (n = 76,331) were retrospectively reviewed. Evaluation for potential contaminants were done by reviewing medical records of patients with the following isolates: coagulase-negative Staphylococcus, viridans group Streptococcus, Bacillus, Corynebacterium, Micrococcus, Aerococcus, and Proprionibacterium species. Repeated cultures with same isolates were considered as a single case. Cases were evaluated for their status as a pathogen. Results: Coagulase-negative Staphylococcus had clinical significance in 23.8% of all cases. Its rate of being a true pathogen was particularly high in patients with malignancy (43.7%). Viridans group Streptococcus showed clinical significance in 46.2% of all cases. Its rate of being a true pathogen was similar regardless of the underlying morbidity of the patient. The rate of being a true pathogens for remaining isolates was 27.7% for Bacillus and 19.0% for Corynebacterium species. Conclusions: Coagulase-negative Staphylococcus and viridans group Streptococcus isolates showed high probability of being true pathogens in the pediatric population, especially in patients with underlying malignancy.
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Affiliation(s)
- Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Medical School & Hospital, Gwangju 61469, Korea.
- Department of Laboratory Medicine & Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea.
| | - Cheol-In Kang
- Division of Infectious Diseases, Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea.
| | - Yae-Jean Kim
- Division of Infectious Diseases and Immunodeficiency, Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea.
| | - Nam Yong Lee
- Department of Laboratory Medicine & Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea.
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Choi HW, Shin JH, Kee SJ, Kwon YS, Ma T, Lee HS, Chun S, Won EJ, Shin JH. Reply to Aubry and Veziris: Smear Microscopy Complements Xpert MTB/RIF When Considering Nontuberculous Mycobacterial Infections. Am J Respir Crit Care Med 2019; 200:1073-1074. [PMID: 31211915 PMCID: PMC6794118 DOI: 10.1164/rccm.201906-1099le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Hyun-Woo Choi
- Chonnam National University Medical SchoolGwangju, Republic of Koreaand.,Chonnam National University HospitalGwangju, Republic of Korea
| | - Ju-Hyeon Shin
- Chonnam National University Medical SchoolGwangju, Republic of Koreaand.,Chonnam National University HospitalGwangju, Republic of Korea
| | - Seung-Jung Kee
- Chonnam National University Medical SchoolGwangju, Republic of Koreaand.,Chonnam National University HospitalGwangju, Republic of Korea
| | - Yong-Soo Kwon
- Chonnam National University Medical SchoolGwangju, Republic of Koreaand.,Chonnam National University HospitalGwangju, Republic of Korea
| | - Taeo Ma
- Chonnam National University Medical SchoolGwangju, Republic of Koreaand.,Chonnam National University HospitalGwangju, Republic of Korea
| | - Hyun-Seung Lee
- Chonnam National University Medical SchoolGwangju, Republic of Koreaand.,Chonnam National University HospitalGwangju, Republic of Korea
| | - Sejong Chun
- Chonnam National University Medical SchoolGwangju, Republic of Koreaand.,Chonnam National University HospitalGwangju, Republic of Korea
| | - Eun Jeong Won
- Chonnam National University Medical SchoolGwangju, Republic of Koreaand.,Chonnam National University HospitalGwangju, Republic of Korea
| | - Jong-Hee Shin
- Chonnam National University Medical SchoolGwangju, Republic of Koreaand.,Chonnam National University HospitalGwangju, Republic of Korea
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24
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Kim J, Kim S, Kang J, Chun S, Kim SY. Clinical implication of multiplex IHC and serologic biomarkers on hyperprogression in NSCLC patients receiving immune checkpoint blockers in real world. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz260.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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25
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Oh E, Kim D, Cha Y, Chun S, Chie E, Kim K, Park J, Kim J, Yu J, Kim S, Nam T, Kim J. Evaluation of the New AJCC Staging System (8th edition) in Anal Cancer Patients Treated with Curative Chemoradiotherapy (KROG 18-05). Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.2157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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26
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Yun JW, Lee S, Kim HM, Chun S, Engleman EG, Kim HC, Kang ES. A Novel Type of Blood Biomarker: Distinct Changes of Cytokine-Induced STAT Phosphorylation in Blood T Cells Between Colorectal Cancer Patients and Healthy Individuals. Cancers (Basel) 2019; 11:cancers11081157. [PMID: 31409016 PMCID: PMC6721561 DOI: 10.3390/cancers11081157] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Revised: 07/13/2019] [Accepted: 08/07/2019] [Indexed: 12/18/2022] Open
Abstract
Background: Colorectal cancer (CRC) is one of the leading causes of cancer-related deaths worldwide. Although early diagnosis and treatment is the most successful strategy for improving patient survival, feasible and sensitive blood biomarkers for CRC screening remain elusive. Methods: Sixty-five CRC patients and thirty-three healthy individuals were enrolled. Peripheral blood (PB) and tumor tissues from CRC patients, and PB from healthy individuals were subjected to immunophenotyping and phospho-flow analysis of cytokine-induced phosphorylated STAT (CIPS). Logistic regression was used as a classifier that separates CRC patients from healthy individuals. Results: The proportion of regulatory T cells was increased in PB from CRC patients compared to PB from healthy individuals (p < 0.05). Interestingly, peripheral T cells share several cytokine-induced phosphorylated STAT (CIPS) signatures with T cells from CRC tumor-sites. Additionally, a classifier was made using two signatures distinct between T cells from CRC patients and T cells from healthy individuals. The AUCs (area under curves) of the classifier were 0.88 in initial cohort and 0.94 in the additional validation cohort. Overall AUC was 0.94 with sensitivity of 91% and specificity of 88%. Conclusion: This study highlights that immune cell signatures in peripheral blood could offer a new type of biomarker for CRC screening.
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Affiliation(s)
- Jae Won Yun
- Department of Laboratory Medicine & Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea
- Samsung Advanced Institute of Health Science and Technology, Sungkyunkwan University, Seoul 06351, Korea
- Samsung Genome Institute, Samsung Medical Center, Seoul 06351, Korea
| | - Sejoon Lee
- Samsung Genome Institute, Samsung Medical Center, Seoul 06351, Korea
- Department of Pathology, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do 13620, Korea
| | - Hye Mi Kim
- Samsung Biomedical Research Institute, Samsung Medical Center, Seoul 06351, Korea
| | - Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Medical School & Hospital, Gwangju 61469, Korea
| | - Edgar G Engleman
- Department of Pathology, Stanford University School of Medicine, Palo Alto, CA 94304-1204, USA
| | - Hee Cheol Kim
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, 06351, Korea.
| | - Eun-Suk Kang
- Department of Laboratory Medicine & Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea.
- Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Seoul 06351, Korea.
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Yun JW, Bae YK, Cho SY, Kim HJ, Nam DH, Kim SH, Chun S, Joo KM, Lee HW, Park WY. Abstract 1723: Elucidation of novel therapeutic targets for acute myeloid leukemias with RUNX1- RUNX1T1 fusion. Cancer Res 2019. [DOI: 10.1158/1538-7445.am2019-1723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
The RUNX1-RUNX1T1 fusion is a frequent chromosomal alteration in acute myeloid leukemias (AMLs). Although RUNX1-RUNX1T1 fusion protein has pivotal roles in the development of AMLs with the fusion, RUNX1-RUNX1T1 fusion protein is difficult to target since it lacks kinase activities. Here, we used a sophisticated bioinformatic tool to elucidate targetable signaling pathways in AMLs with RUNX1-RUNX1T1 fusion. After analysis of 93 AMLs from the TCGA database, the expressions of 293 genes were significantly correlated with the expression of the RUNX1-RUNX1T1 fusion gene. Based on the 293 genes, the COX, VEGFR, PDGFR, and FGFR pathways are predicted to be specifically activated in AMLs with RUNX1-RUNX1T1 fusion. Compared with the AML cells without the fusion, the specific activations of the AML cell lines with RUNX1-RUNX1T1 fusion were confirmed by the increased phosphorylation of VEGFRs, PDGFRs, and FGFRs. Moreover, the in vitro proliferation of AML cells with RUNX1-RUNX1T1 fusion decreased significantly more than that of AML cells without the fusion when the pathways were inhibited pharmacologically. The results indicate that novel targetable signaling pathways could be identified by the analysis of the gene expression features of AMLs with non-targetable genetic alterations. The elucidation of specific molecular targets for AMLs that have a specific genetic alteration would promote personalized treatment of AMLs and improve treatment outcomes for AML patients in clinic.
Note: This abstract was not presented at the meeting.
Citation Format: Jae Won Yun, Yoon Kyung Bae, So Yeong Cho, Hee-Jin Kim, Do-Hyun Nam, Sun-Hee Kim, Sejong Chun, Kyeung Min Joo, Hye Won Lee, Woong-Yang Park. Elucidation of novel therapeutic targets for acute myeloid leukemias with RUNX1-RUNX1T1 fusion [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2019; 2019 Mar 29-Apr 3; Atlanta, GA. Philadelphia (PA): AACR; Cancer Res 2019;79(13 Suppl):Abstract nr 1723.
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Affiliation(s)
- Jae Won Yun
- 1Samsung Medical Center, Seoul, Republic of Korea
| | | | - So Yeong Cho
- 2Sungkyunkwan University, Suwon, Republic of Korea
| | - Hee-Jin Kim
- 1Samsung Medical Center, Seoul, Republic of Korea
| | - Do-Hyun Nam
- 1Samsung Medical Center, Seoul, Republic of Korea
| | - Sun-Hee Kim
- 1Samsung Medical Center, Seoul, Republic of Korea
| | - Sejong Chun
- 3Chonnam National University, Gwangju, Republic of Korea
| | | | - Hye Won Lee
- 2Sungkyunkwan University, Suwon, Republic of Korea
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Ha C, Choi S, Yu H, Chun S, Kim KH, Lee JH, Han IW, Cho D. First Case in Korea of a Patient With Anti-PP1Pk Antibodies: Successful Blood Management via Acute Normovolemic Hemodilution. Ann Lab Med 2019; 39:602-605. [PMID: 31240895 PMCID: PMC6660340 DOI: 10.3343/alm.2019.39.6.602] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 02/25/2019] [Accepted: 05/28/2019] [Indexed: 11/19/2022] Open
Affiliation(s)
- Changhee Ha
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Sooin Choi
- Department of Laboratory Medicine, Soonchunhyang University Hospital Cheonan, Soonchunhyang University College of Medicine, Cheonan, Korea
| | - HongBi Yu
- Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Korea
| | - Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Medical School & Hospital, Gwangju, Korea
| | - Kyeong Hee Kim
- Department of Laboratory Medicine, Dong-A University Hospital, Busan, Korea
| | - Jong Hwan Lee
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
| | - In Woong Han
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Duck Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.,Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Korea.
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29
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Lee E, Kim H, Ahn S, Lee W, Kim H, Chun S, Min W. Performance evaluation of a novel automated chemiluminescence immunoassay for the concentration of everolimus and sirolimus. Clin Chim Acta 2019. [DOI: 10.1016/j.cca.2019.03.1581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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30
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Lee W, Kim A, Kim H, An S, Hong Y, Lim S, Byeon J, Chun S, Min W. Identification of a novel splice site variant of APC gene in a patient with familial adenomatous polyposis. Clin Chim Acta 2019. [DOI: 10.1016/j.cca.2019.03.434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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31
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Kweon S, Phan MTT, Chun S, Yu H, Kim J, Kim S, Lee J, Ali AK, Lee SH, Kim SK, Doh J, Cho D. Expansion of Human NK Cells Using K562 Cells Expressing OX40 Ligand and Short Exposure to IL-21. Front Immunol 2019; 10:879. [PMID: 31105701 PMCID: PMC6491902 DOI: 10.3389/fimmu.2019.00879] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Accepted: 04/05/2019] [Indexed: 11/13/2022] Open
Abstract
Background: Natural Killer (NK) cell-based immunotherapy used to treat cancer requires the adoptive transfer of a large number of activated NK cells. Here, we report a new effective method to expand human NK cells ex vivo using K562 cells genetically engineered (GE) to express OX40 ligand (K562-OX40L) in combination with a short exposure to soluble IL-21. In addition, we describe a possible mechanism of the NK cell expansion through the OX40 receptor-OX40 ligand axis which is dependent on NK cell homotypic interaction. Methods: K562-OX40L cells were generated by lentiviral transduction and were used as feeder cells to expand and activate NK cells from PBMCs in the presence of IL-2/IL-15. Soluble IL-21 was also added in various concentrations only once at the beginning of the culture. NK cells were expanded for 4–5 weeks, and the purity, expansion rate, phenotype and function (cytotoxicity, antibody-dependent cell-mediated cytotoxicity (ADCC), cytokine production, CD107a degranulation) of these expanded NK cells were compared to those generated by using K562 feeder cells. Results: The culture of NK cells with K562-OX40L cells in combination with the transient exposure to IL-21 highly enhanced NK cell expansion to approximately 2,000-fold after 4 weeks of culture, compared to a 303-fold expansion using the conventional K562 cells. Mechanistically, the OX40-OX40L axis between the feeder cells and NK cells as well as the homotypic interaction between NK cells through the OX40-OX40L axis were both necessary for NK cell expansion. The short exposure of NK cells to IL-21 had a synergistic effect with OX40 signaling for NK cell expansion. Apart from their enhanced expansion, NK cells grown with K562-OX40L feeder cells were similar to those grown with conventional K562 cells in regard to the surface expression of various receptors, cytotoxicity, ADCC, cytokine secretion, and CD107 degranulation. Conclusion: Our data suggest that OX40 ligand is a potent co-stimulant for the robust expansion of human NK cells and the homotypic NK cell interactions through the OX40-OX40L axis is a mechanism of NK cell expansion.
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Affiliation(s)
- SoonHo Kweon
- School of Interdisciplinary Bioscience and Bioengineering (I-Bio), POSTECH, Pohang, South Korea
| | | | - Sejong Chun
- Department of Laboratory Medicine, Chonnam National University, GwangJu, South Korea
| | - HongBi Yu
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea
| | - Jinho Kim
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea
| | - Seokho Kim
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
| | - Jaemin Lee
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
| | - Alaa Kassim Ali
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Seung-Hwan Lee
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Sang-Ki Kim
- Laboratory Animal Science, Department of Companion, Kongju National University, Yesan, South Korea
| | - Junsang Doh
- Department of Materials Science and Engineering, Seoul National University, Seoul, South Korea
| | - Duck Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.,Stem Cell and Regenerative Medicine Institute, Samsung Medical Center, Seoul, South Korea.,Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, South Korea
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32
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Chun S, Choi S, Yu H, Cho D. Cis-AB, the Blood Group of Many Faces, Is a Conundrum to the Novice Eye. Ann Lab Med 2019; 39:115-120. [PMID: 30430772 PMCID: PMC6240514 DOI: 10.3343/alm.2019.39.2.115] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 07/09/2018] [Accepted: 10/22/2018] [Indexed: 11/19/2022] Open
Abstract
Cis-AB, a rare ABO variant, is caused by a gene mutation that results in a single glycosyltransferase enzyme with dual A and B glycosyltransferase activities. It is the most frequent ABO subgroup in Korea, and it occurs more frequently in the East Asian region than in the rest of the world. The typical phenotype of cis-AB is A2B3, but it can express various phenotypes when paired with an A or B allele, which can lead to misclassification in the ABO grouping and consequently to adverse hemolytic transfusion reactions. While cis-AB was first discovered as having an unusual inheritance pattern, it was later found that both A and B antigens are expressed from the same allele inherited from a single parent; hence, the name cis-AB. Earlier studies relied on serological and familial investigation of cis-AB subjects, but its detection has become much easier with the introduction of molecular methods. This review will summarize the serological variety, genetic basis and inheritance pattern, laboratory methods of investigation, clinical significance, and the blood type of choice for transfusion for the cis-AB blood group.
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Affiliation(s)
- Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Medical School & Hospital, Gwangju, Korea
| | - Sooin Choi
- Department of Laboratory Medicine, Soonchunhyang University Hospital Cheonan, Soonchunhyang University College of Medicine, Cheonan, Korea
| | - HongBi Yu
- Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Korea
| | - Duck Cho
- Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Korea.,Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
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Kim HY, Cho EJ, Chun S, Kim KH, Cho D. Red Blood Cell Alloimmunization in Korean Patients With Myelodysplastic Syndrome and Liver Cirrhosis. Ann Lab Med 2018; 39:218-222. [PMID: 30430787 PMCID: PMC6240531 DOI: 10.3343/alm.2019.39.2.218] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 07/31/2018] [Accepted: 10/11/2018] [Indexed: 12/02/2022] Open
Abstract
Red blood cell (RBC) alloimmunization varies across human populations and ethnic groups. We evaluated the characteristics of RBC alloimmunization and compared the risk of alloimmunization in Korean patients with myelodysplastic syndrome (MDS) and liver cirrhosis (LC), two representative diseases in which chronic transfusion is required. In total, 115 MDS patients and 202 LC patients transfused with RBCs between 2013 and 2015 were retrospectively included. Twenty patients (6.3%) were newly alloimmunized (five MDS patients, 4.3%; 15 LC patients, 7.4%). The median number of RBC units transfused in alloimmunized patients was nine (interquartile range, 4–15 units). As the number of transfused RBC units increased, the cumulative risk of alloimmunization was higher in LC than in MDS patients (P=0.001). The most common alloantibody detected in patients was anti-E (45%), followed by anti-c (17%), anti-e (10%), anti-C (7%), anti-Fyb (7%), and anti-Jka (7%). The present data indicate the need for matching of extended RBC antigens (Rh, Duffy, and Kidd systems) for chronically transfused patients with MDS and LC in Korea.
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Affiliation(s)
- Hyun Young Kim
- Department of Laboratory Medicine, Gyeongsang National University Hospital, Gyeongsang National University School of Medicine, Jinju, Korea
| | - Eun Jung Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea
| | - Kyeong Hee Kim
- Department of Laboratory Medicine, Dong-A University College of Medicine, Busan, Korea
| | - Duck Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.,Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Seoul, Korea.
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Choi S, Chun S, Lee HT, Yu H, Seo JY, Cho D. Weak D Testing is not Required for D- Patients With C-E- Phenotype. Ann Lab Med 2018; 38:585-590. [PMID: 30027703 PMCID: PMC6056382 DOI: 10.3343/alm.2018.38.6.585] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/27/2017] [Accepted: 05/30/2018] [Indexed: 12/05/2022] Open
Abstract
Background Although testing to detect weak D antigens using the antihuman globulin reagent is not required for D− patients in many countries, it is routinely performed in Korea. However, weak D testing can be omitted in D− patients with a C−E− phenotype as this indicates complete deletion of the RHD gene, except in rare cases. We designed a new algorithm for weak D testing, which consisted of RhCE phenotyping followed by weak D testing in C+ or E+ samples, and compared it with the current algorithm with respect to time and cost-effectiveness. Methods In this retrospective study, 74,889 test results from January to July 2017 in a tertiary hospital in Korea were analyzed. Agreement between the current and proposed algorithms was evaluated, and total number of tests, time required for testing, and test costs were compared. With both algorithms, RHD genotyping was conducted for samples that were C+ or E+ and negative for weak D testing. Results The algorithms showed perfect agreement (agreement=100%; κ=1.00). By applying the proposed algorithm, 29.56% (115/389 tests/yr) of tests could be omitted, time required for testing could be reduced by 36% (8,672/24,084 min/yr), and the test cost could be reduced by 16.53% (536.11/3,241.08 USD/yr). Conclusions Our algorithm omitting weak D testing in D− patients with C−E− phenotype may be a cost-effective testing strategy in Korea.
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Affiliation(s)
- Sooin Choi
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Medical School, Gwangju, Korea
| | - Hwan Tae Lee
- Department of Laboratory Medicine Gachon University Gil Medical Center, Incheon, Korea
| | - HongBi Yu
- Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Korea
| | - Ji Young Seo
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Duck Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.,Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Korea.
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Kim GH, Dang HN, Phan MTT, Kweon SH, Chun S, Cho D. X-ray as Irradiation Alternative for K562 Feeder Cell Inactivation in Human Natural Killer Cell Expansion. Anticancer Res 2018; 38:5767-5772. [PMID: 30275198 DOI: 10.21873/anticanres.12915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 09/04/2018] [Accepted: 09/05/2018] [Indexed: 11/10/2022]
Abstract
BACKGROUND/AIM γ-Irradiation has been proven to be the most effective method to inactivate K562 cells, but γ-irradiators are not available in some institutes. This study was designed to compare the effects of X-ray and γ-irradiation on K562 cells in natural killer (NK) cell expansion. MATERIALS AND METHODS To expand NK cells, isolated peripheral blood mononuclear cells (PBMCs) were co-cultured with γ-irradiated or X-ray-treated K562 cells plus IL-2 and IL-15. Characteristics of expanded NK cells were identified by flow cytometry. RESULTS NK cell expansion rate tended be to lower in the X-ray-treated group (68.9±32.6) than the γ-irradiated group (78±28.7), but the difference was not significant (p=0.39). Furthermore, NK cell functions or receptor expression were similar in the two groups. CONCLUSION Our results suggest that X-ray treatment can be used as an alternative to γ-irradiation for K562 cells inactivation in human NK cell expansion.
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Affiliation(s)
- Gwang Ho Kim
- Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Republic of Korea
| | - Hoang-Nguyen Dang
- Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Republic of Korea
| | - Minh-Trang Thi Phan
- Department of Mechanical Engineering at POSTECH, Gyeongbuk, Republic of Korea.,Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Soon Ho Kweon
- School of Interdisciplinary Bioscience and Bioengineering (I-Bio), POSTECH, Pohang, Republic of Korea
| | - Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Duck Cho
- Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Republic of Korea .,Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.,School of Interdisciplinary Bioscience and Bioengineering (I-Bio), POSTECH, Pohang, Republic of Korea.,Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Seoul, Republic of Korea
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Chun S, Meloche J, Woo A, Yu E. COMPETENCE IN ADULT ECHOCARDIOGRAPHY OF GRADUATING CARDIOLOGY TRAINEES: TWO-YEAR STUDY. Can J Cardiol 2018. [DOI: 10.1016/j.cjca.2018.07.276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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37
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Choi S, Chun S, Seo JY, Yang JH, Cho D. Planned Transfusion of D-Positive Blood Components in an Asia Type DEL Patient: Proposed Modification of the Korean National Guidelines for Blood Transfusion. Ann Lab Med 2018; 39:102-104. [PMID: 30215239 PMCID: PMC6143459 DOI: 10.3343/alm.2019.39.1.102] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 04/16/2018] [Accepted: 08/16/2018] [Indexed: 11/19/2022] Open
Affiliation(s)
- Sooin Choi
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Medical School & Hospital, Gwangju, Korea
| | - Ji Young Seo
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Ji Hyuk Yang
- Department of Thoracic and Cardiovascular Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Duck Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
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38
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Kim BR, Chun S, Cho D, Kim KH. Association of neutrophil-to-lymphocyte ratio and natural killer cell activity revealed by measurement of interferon-gamma levels in a healthy population. J Clin Lab Anal 2018; 33:e22640. [PMID: 30105845 DOI: 10.1002/jcla.22640] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Revised: 07/11/2018] [Accepted: 07/12/2018] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND While a method of assaying natural killer (NK) cell activity by measuring the amount of interferon (IFN)-γ released from NK cells has been proposed, no data are available about the factors that influence IFN-γ levels related to NK cell activity. NLR has recently been reported to be a predictor of several diseases. In the present study, we investigated the pre-analytical variables for NK cell activity using measurements of IFN-γ and the relationship between NLR and NK cell activity. METHODS The NK cell activity was assessed with the measurement of IFN-γ after stimulation with an NK cell-specific stimulant (NK Vue™ , ATgen, Sungnam, Korea). One hundred and six adult volunteers were recruited and analysis of their complete blood count data and serum C-reactive protein was done. Blood sample from 59 of the participants was also used for analysis of lymphocyte subpopulations. RESULT Natural killer cell activity varied widely (range, 44.2-1775.6 pg/mL). NK cell activity was higher in females than in males (P = 0.014). NK cell activity decreased with increasing NLR (P = 0.004, r = -0.32) but NK cell activity showed no significant association with NK cell count or other lymphocyte subpopulations. NK cell activity levels according to CRP quartile were significantly different (P = 0.025). CONCLUSION We have observed that NK cell activity when assessed by IFN-γ level measurement was negatively correlating with NLR. This result can be helpful in interpreting or predicting NK cell activity in the clinical environment.
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Affiliation(s)
- Bo-Ram Kim
- Department of Laboratory Medicine, Ulsan City Hospital Group, Ulsan, Korea
| | - Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Medical School & Hospital, Gwangju, Korea
| | - Duck Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunwan University School of Medicine, Seoul, Korea
| | - Kyeong-Hee Kim
- Department of Laboratory Medicine, Dong-A University College of Medicine, Busan, Korea
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39
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Lee SH, Lee J, Chun S, Kang W. In situ measurement of micro flow rate using near infrared absorption method. Opt Express 2018; 26:17078-17091. [PMID: 30119525 DOI: 10.1364/oe.26.017078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 06/12/2018] [Indexed: 06/08/2023]
Abstract
A novel technique is presented for measuring micro flow rate using the near infrared (NIR) absorption method. The principle of this method is based on the temperature dependency of the NIR absorption band of water (O-H band, ν1 + ν3). We obtained the water temperature in the tube in situ condition using NIR absorption method. A calibration curve between temperature and the NIR absorption intensity in the range of 1500 nm - 1700 nm wavelength was obtained. For measuring flow rate in the tube, the tiny spot of water in the tube was heated using NIR laser (1450 nm) through the lens which was absorbed into the water. The temperature profiles along the tube were obtained using the NIR absorption method via laser heating for different flow rates. The simulation results of the temperature profiles were well matched with the experimental results of it for different flow rates. We found that the conduction affected the temperature more when the flow was low in the upstream and the convection more affected when the flow rate was high in the downstream through the heat transfer analysis. The flow rates were obtained from the temperature difference between the room temperature and the obtained temperature from the NIR method. The calibration curves between the flow rate and temperature obtained from the NIR absorption method was obtained in the two flow rates (1-20 mL/h and 40-100 mL/h). The error and uncertainty of the NIR absorption method for measuring flow rate were approximately 1.2% and 1% at the 1-100 mL/min flow rate, respectively. Thus, we confirmed that the NIR absorption method quantitatively measures the flow rate with respect to the in situ condition for the first time. This method is used for various applications including biomedical and chemical processing without causing any contamination owing to the flow meter installation.
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40
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Chung YN, Chun S, Phan MTT, Nam MH, Choi BM, Cho D, Choi JS. The first case of congenital blood chimerism in two of the triplets in Korea. J Clin Lab Anal 2018; 32:e22580. [PMID: 29797734 DOI: 10.1002/jcla.22580] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 05/05/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Chimeras are composed of two or more different populations that originated from different zygotes. Blood chimerism arising from twins have been reported in the literature. Herein, we report the first blood group chimerism in triplets. METHODS ABO blood grouping was carried out by manual tile methods (Merck Millipore, UK) and micro-column agglutination method (Bio-Rad, Cressier sur Morat, Switzerland). Flow cytometric analysis was performed with Anti-A-PE conjugated monoclonal antibodies (BD Biosciences, San Jose, CA, USA) and FACS Canto II (BD Biosciences). Molecular analysis was performed with allele-specific polymerase chain reaction (AS-PCR) and direct sequencing of the exons 6 and 7. RESULTS Mixed-field agglutination and weak agglutination against anti-A were revealed by ABO blood grouping. Flow cytometric analysis revealed the presence of both A cells and O cells. AS-PCR and sequencing showed two neonates with chimerism, with each neonate`s genotype being A102/O01/O02. CONCLUSION This is the first recorded case of blood chimera from a triplet in Korea. We recommend full investigation of blood group chimerism in neonates with ABO discrepancy, as blood chimerism is subject to certain caution in the clinical environment.
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Affiliation(s)
- Yoo Na Chung
- Department of Laboratory Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea
| | - Sejong Chun
- Department of Laboratory Medicine, Chonnam National University Medical School & Hospital, Gwangju, Korea
| | - Minh-Trang Thi Phan
- Samsung Bioscience Research Institute, Samsung Medical Center, Sungkyunkwan University College of Medicine, Seoul, Korea
| | - Myung-Hyun Nam
- Department of Laboratory Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea
| | - Byung Min Choi
- Department of Pediatrics, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea
| | - Duck Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University College of Medicine, Seoul, Korea
| | - Ji Seon Choi
- Department of Laboratory Medicine, International St. Mary's Hospital, Catholic Kwandong University College of Medicine, Incheon, Korea
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41
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Chun S. PO-0719: Risk factors influencing survival after re-Op plus re-RT for recurrent high-grade gliomas. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)31029-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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42
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Chun S, Ryu MR, Cha SY, Seo JY, Cho D. ABO Mistyping of cis-AB Blood Group by the Automated Microplate Technique. Transfus Med Hemother 2018; 45:5-10. [PMID: 29593455 DOI: 10.1159/000475506] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 04/03/2017] [Indexed: 01/02/2023] Open
Abstract
Background The cis-AB phenotype, although rare, is the relatively most frequent of ABO subgroups in Koreans. To prevent ABO mistyping of cis-AB samples, our hospital has applied a combination of the manual tile method with automated devices. Herein, we report cases of ABO mistyping detected by the combination testing system. Methods Cases that showed discrepant results by automated devices and the manual tile method were evaluated. These samples were also tested by the standard tube method. The automated devices used in this study were a QWALYS-3 and Galileo NEO. Exons 6 and 7 of the ABO gene were sequenced. Results 13 cases that had the cis-AB allele showed results suggestive of the cis-AB subgroup by manual methods, but were interpreted as AB by either automated device. This happened in 87.5% of these cases by QWALYS-3 and 70.0% by Galileo NEO. Genotyping results showed that 12 cases were ABO*cis-AB01/ABO*O01 or ABO*cis-AB01/ABO*O02, and one case was ABO*cis-AB01/ ABO*A102. Conclusion Cis-AB samples were mistyped as AB by the automated microplate technique in some cases. We suggest that the manual tile method can be a simple supplemental test for the detection of the cis-AB phenotype, especially in countries with relatively high cis-AB prevalence.
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Affiliation(s)
- Sejong Chun
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Mi Ra Ryu
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Seung-Yeon Cha
- Samsung Biomedical Research Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Ji-Young Seo
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Duck Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.,Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Seoul, South Korea
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Chun S, Yun JW, Park G, Cho D. The synonymous nucleotide substitution RHD 1056C>G alters mRNA splicing associated with serologically weak D phenotype. J Clin Lab Anal 2017; 32:e22330. [PMID: 28926139 DOI: 10.1002/jcla.22330] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2017] [Accepted: 08/30/2017] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND D antigen is one of the most clinically significant blood group antigens. Variation of the RHD gene can cause weak D or partial D phenotypes. While most variations are missense substitutions with amino acid changes, those without are called "silent" or "synonymous" substitutions. Synonymous substitutions often have little effect on the protein, not altering the phenotype. However, effect on splicing can affect end-product protein. We report a new synonymous variation, RHD 1056C>G, that resulted in weak D phenotype, and predicted its effect with various in silico methods. METHODS Serologic testing of the D antigen with full sequencing of the RHD gene was done. Human Splice Finder was used to predict the effect of this variation, and validation of this method was done with all known RHD variations reported in the literature. RESULTS RHD 1056C>G was predicted to cause the formation of an exonic splicing silencer (ESS) site. The creation of new ESS site potentially inhibits the splicing event, resulting alteration of splicing. This is similar to remodeling of splice acceptor or donor site, as this kind of deep exonic variation could affect the D antigen's quality or quantity. This is in concordance with serologic results, which showed only delayed weak agglutination to anti-D reagents. CONCLUSIONS The analytic methods we applied showed good correlation with the actual phenotype, along with concordant results when analyzing other known variants reported in the literature. We conclude that RHD 1056C>G results in serologic weak D phenotype.
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Affiliation(s)
- Sejong Chun
- Department of Laboratory Medicine & Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jae Won Yun
- Samsung Advanced Institute of Health Science and Technology, Sungkyunkwan University, Seoul, Korea
| | - Geon Park
- Department of Laboratory Medicine, Chosun University College of Medicine, Gwangju, Korea
| | - Duck Cho
- Department of Laboratory Medicine & Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.,Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Seoul, Korea
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Chun S, Chan K, McCallion P, Ferretti L, Shi J. IMPACT OF DISABILITY ON ACCESS TO DIABETES CARE AMONG OLDER ADULTS WITH DIABETES. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.1744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- S. Chun
- University at Albany SUNY, Cambridge, Massachusetts
| | - K. Chan
- University at Albany SUNY, Cambridge, Massachusetts
| | - P. McCallion
- University at Albany SUNY, Cambridge, Massachusetts
| | - L. Ferretti
- University at Albany SUNY, Cambridge, Massachusetts
| | - J. Shi
- University at Albany SUNY, Cambridge, Massachusetts
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45
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Chun S, Eom K, Kim H. EP-1294: Interfractional motion of vaginal cuff after hysterectomy in gynecologic cancer. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31729-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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46
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Chun S, Kim EY, Cha SY, Seo JY, Koo HH, Cho D. Application of a portable microscopic cell counter for the counting of residual leukocytes in leukoreduced apheresis platelet concentrates in a hospital blood bank. Transfus Apher Sci 2017; 56:427-430. [PMID: 28456469 DOI: 10.1016/j.transci.2017.03.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 03/20/2017] [Accepted: 03/29/2017] [Indexed: 11/16/2022]
Abstract
While a portable microscopic cell counter has been evaluated to enumerate residual white blood cells (WBCs) in red blood cells and platelet concentrates at blood centers, it has not yet been assessed in a hospital blood bank. We investigated the performance of this device and evaluated its accuracy, along with its benefits in time management. Residual WBCs from each of 100 apheresis platelet specimens were measured manually using a Nageotte chamber, along with flow cytometry methods and an ADAM-rWBC automated instrument (NanoEnTek, Seoul, South Korea). The efficiency was calculated by measuring the time required for the analysis of one specimen ten times consecutively. Flow cytometry and the ADAM-rWBC were able to detect four sporadic cases that had residual WBCs exceeding 1/μL that were not detected by the manual method. Analysis time was the shortest with the ADAM-rWBC, followed by flow cytometry and the manual method. Our data suggest that hospital blood banks require quality control of residual WBCs; among the methods evaluated in this study, the portable microscopic cell counter offers the best time efficiency.
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Affiliation(s)
- Sejong Chun
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Eun-Young Kim
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Seung-Yeon Cha
- Samsung Biomedical Research Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Ji-Young Seo
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Hong Hoe Koo
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Duck Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea; Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Seoul, Republic of Korea.
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Oh CM, Chun S, Lee JE, Lee JS, Park S, Gee HY, Kim SW. A novel missense mutation in NR0B1 causes delayed-onset primary adrenal insufficiency in adults. Clin Genet 2017; 92:344-346. [PMID: 28075027 DOI: 10.1111/cge.12966] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Revised: 01/09/2017] [Accepted: 01/09/2017] [Indexed: 11/28/2022]
Abstract
A novel missense mutation (c.775T>C; p.ser259Pro) in the NROBI gene cause a late-onset adrenal insufficiency without hypogonadism.
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Affiliation(s)
- C-M Oh
- Department of Internal Medicine, CHA Bundang Medical Center, School of Medicine CHA University, Seongnam, Korea
| | - S Chun
- Department of Internal Medicine, CHA Bundang Medical Center, School of Medicine CHA University, Seongnam, Korea
| | - J-E Lee
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul, Korea
| | - J S Lee
- Department of Pharmacology, Brain Korea 21 Project for Medical Sciences, Yonsei University College of Medicine, Seoul, Korea
| | - S Park
- Department of Biochemistry, College of Medicine, Catholic Kwandong University, Gangneung, Korea
| | - H Y Gee
- Department of Pharmacology, Brain Korea 21 Project for Medical Sciences, Yonsei University College of Medicine, Seoul, Korea
| | - S W Kim
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.,Department of Internal Medicine, Boramae Medical Center, Seoul, Korea
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Chun S, Chung CR, Ha YE, Han TH, Ki CS, Kang ES, Park JK, Peck KR, Cho D. Possible Transfusion-Related Acute Lung Injury Following Convalescent Plasma Transfusion in a Patient With Middle East Respiratory Syndrome. Ann Lab Med 2017; 36:393-5. [PMID: 27139619 PMCID: PMC4855066 DOI: 10.3343/alm.2016.36.4.393] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2015] [Revised: 12/11/2015] [Accepted: 03/15/2016] [Indexed: 01/10/2023] Open
Affiliation(s)
- Sejong Chun
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Chi Ryang Chung
- Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Young Eun Ha
- Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Tae Hee Han
- Department of Laboratory Medicine, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
| | - Chang Seok Ki
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Eun Suk Kang
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jin Kyeong Park
- Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Kyong Ran Peck
- Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
| | - Duck Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
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Cho YY, Chun S, Lee SY, Chung JH, Park HD, Kim SW. Performance Evaluation of the Serum Thyroglobulin Assays With Immunochemiluminometric Assay and Immunoradiometric Assay for Differentiated Thyroid Cancer. Ann Lab Med 2017; 36:413-9. [PMID: 27374705 PMCID: PMC4940483 DOI: 10.3343/alm.2016.36.5.413] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 02/04/2016] [Accepted: 04/15/2016] [Indexed: 11/30/2022] Open
Abstract
Background Measurement of postoperative serum thyroglobulin (Tg) is important for detecting persistent or recurrent differentiated thyroid cancer. We evaluated the analytic performance of the DxI 800 assay (Beckman Coulter, USA) for serum Tg and anti-thyroglobulin antibodies (TgAbs) in comparison with that of the GAMMA-10 assay (Shinjin Medics Inc., Korea) for serum Tg and RIA-MAT 280 assay (Stratec, Germany) for TgAb. Methods We prospectively collected blood samples from 99 patients thyroidectomized for thyroid cancer. The functional sensitivity was investigated in standards and human serum. Precision and linearity were evaluated according to the guidelines of the Clinical and Laboratory Standards Institute. The correlation between the two assays was assessed in samples with different Tg ranges. Results The functional sensitivity of the DxI 800 assay for serum Tg was between 0.0313 and 0.0625 ng/mL. The total CV was 3.9–5.6% for serum Tg and 5.3–6.9% for serum TgAb. The coefficient of determination (R2) was 1.0 and 0.99 for serum Tg and TgAb, respectively. The cut-offs for serum TgAb were 4.0 IU/mL (DxI 800) and 60.0 IU/mL (RIA-MAT 280), and the overall agreement was 68.7%. The correlation between the two assays was excellent; the correlation coefficient was 0.99 and 0.88 for serum Tg and TgAb, respectively. Conclusions The DxI 800 is a sensitive assay for serum Tg and TgAb, and the results correlated well with those from the immunoradiometric assays (IRMA). This assay has several advantages over the IRMA and could be considered an alternative test for Tg measurement.
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Affiliation(s)
- Yoon Young Cho
- Division of Endocrinology & Metabolism, Department of Medicine, Thyroid Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Sejong Chun
- Department of Laboratory Medicine & Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Soo Youn Lee
- Department of Laboratory Medicine & Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jae Hoon Chung
- Division of Endocrinology & Metabolism, Department of Medicine, Thyroid Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Hyung Doo Park
- Department of Laboratory Medicine & Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
| | - Sun Wook Kim
- Division of Endocrinology & Metabolism, Department of Medicine, Thyroid Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
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50
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Chun S, Phan MT, Kim HY, Shin DJ, Seo JY, Kim KH, Cho D. The A312 Allele (c.280A>T) Is Responsible for the Weak A Phenotype. Ann Clin Lab Sci 2017; 47:99-102. [PMID: 28249926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The ABO*A312 allele was found in a 71-year-old Korean male with ABO discrepancy and in his two sons. Although the ABO*A312 allele (c.280A>T, I94F) in an AwB case was registered in GenBank, the impact of the I94F mutation of the ABO gene on the activity of A transferase has not been studied. Transient transfection experiments were performed in HeLa cells using A101, A102, and A312 alleles synthesized by site-directed mutagenesis, and the functional expression level of A antigen was assessed by flow cytometry. The results showed that the A102 and A312 alleles expressed A antigen levels that were 80.28% and 19.32%, respectively, of that of the A101 allele. Our study results demonstrate that the c.280A>T variant is responsible for the weakened expression of A antigen.
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Affiliation(s)
- Sejong Chun
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Minh-Trang Phan
- Center for Creative Biomedical Scientists, Chonnam National University, Jeollanam-do, South Korea
| | - Hyun-Young Kim
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Dong-Jun Shin
- Department of Companion & Laboratory Animal Science, Kongju National University, Yesan, South Korea
| | - Ji-Young Seo
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Kyeong-Hee Kim
- Department of Laboratory Medicine, Dong-A University Hospital, Busan, South Korea
| | - Duck Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
- Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Seoul, South Korea
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